CA1323688C - Interactive video method and apparatus - Google Patents
Interactive video method and apparatusInfo
- Publication number
- CA1323688C CA1323688C CA000580578A CA580578A CA1323688C CA 1323688 C CA1323688 C CA 1323688C CA 000580578 A CA000580578 A CA 000580578A CA 580578 A CA580578 A CA 580578A CA 1323688 C CA1323688 C CA 1323688C
- Authority
- CA
- Canada
- Prior art keywords
- data
- television
- video
- control data
- modulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
- H04N7/081—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division the additional information signals being transmitted by means of a subcarrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
- H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H30/00—Remote-control arrangements specially adapted for toys, e.g. for toy vehicles
- A63H30/02—Electrical arrangements
- A63H30/04—Electrical arrangements using wireless transmission
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/06—Electrically-operated educational appliances with both visual and audible presentation of the material to be studied
- G09B5/065—Combinations of audio and video presentations, e.g. videotapes, videodiscs, television systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
- H04N21/4126—The peripheral being portable, e.g. PDAs or mobile phones
- H04N21/41265—The peripheral being portable, e.g. PDAs or mobile phones having a remote control device for bidirectional communication between the remote control device and client device
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/002—Special television systems not provided for by H04N7/007 - H04N7/18
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63F—CARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
- A63F9/00—Games not otherwise provided for
- A63F9/24—Electric games; Games using electronic circuits not otherwise provided for
- A63F2009/2401—Detail of input, input devices
- A63F2009/2436—Characteristics of the input
- A63F2009/2442—Sensors or detectors
- A63F2009/2444—Light detector
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H2200/00—Computerized interactive toys, e.g. dolls
Abstract
Abstract of the Disclosure Method and apparatus for in-band, video broadcasting of commands to interactive devices are described. Control data are encoded by subliminally modulating, prior to the remote, composite video broadcast of video program material, a selected sequence of video image fields. The resulting modulated video fields within the viewing area of a television, each having alternately, proportionately raised and lowered luminance horizontal scan lines, are monitored by a light sensitive device positioned adjacent the user's television screen. A semirigid, twisted pair cable connects the device to nearby receiver/transmitter electronics that discriminate the binary data from the program material and amplitude modulate a high frequency infrared (IR) carrier with the data. Interactive devices, e.g. educational aids or action toys, within range of the wireless IR transmission detect energy in this frequency range, decode the commands embedded in the control data, and selectively execute predetermined actions in response to the data-encoded broadcast. In a proposed modification, low radio frequency (RF) electromagnetic radiation emanating from the television's raster scan electronics is coupled by a conventional RF antenna to the receiver electronics, which identically discriminate the binary data, from the program material, for transmission to the interactive devices.
Description
7s ;l ~ ~
INTERACTIVE VID~O M~T~OD AND APPARATUS
Backqround of the Invention This invention relates generally to interactive educational and entertainment systems, and more particularly to method and apparatus for data encoding a video signal at a remote broadcast site, decoding the signal at a reception site, and locally transmitting the data to control one or more interactive devices. The preferred embodiment of the invention is described in the context of television program control of toys located in a television viewer's home.
Videotext systems are known to be able to provide data communication from a remote video broadcast site to home television viewers over conventional broadcast channels. One such videotext system provides closed captioning of audio program material for the hearing-impaired, wherein the interpretive text is transmitted during vertical synchronization intervals of the raster ~can process. Only televisions that are specially equipped with decoders are able to display the captions, and the displaying of video text in synchronization with the television's raster scan electronics requires the physical interconnection of the decoder and the television, e.g.
an antenna hookup. Frequently, the payment of a subscription fee is required.
Attempts to provide systems capable of generalized, in-band data communications have met only marginal success.
This is because conventional in-band signaling is disruptive of the television's video image. For example, when data and pixel information are mixed in the same video field or frame, they are spa~ially separated to enable a light sensitive detector unobtrusively to monitor the data-encoded subfield. $ypically, this spatial separation is achieved by defining one or more ~ ~s ~
cells, each of which is first blan~ed and then reprogrammed with high and low luminance regions representing binary coded data.
Depending upon the size, number and coding of such data cells, the effective viewing area of the video program material is more or less adversely impacted. Such video data communications systems do not lend themselves to conventional broadcast channels, where subscribing and nonsubscribing television receivers alike will display the composite pixel and data information. Visual clutter that is visible on the television screens of nonsubscribers, or on the screens of subscribers who are not using their light sensitive detector at the time, likely will result in consumer complaints and FCC
restrictions.
It is desirable to provide an interactive video system capable of simplex data communications that is raster time-base error tolerant, and that requires no electrical connections to the television set. Such a system should be capable of communicating at a rate sufficient to control an interactive electromechanical device, e.g. an action toy, in real time response to the video program's story line. The system preferably would be compatible with conventional television broadcast, reception and recording equipment and channels. Reception equipment qhould impose little or no setup time,and difficulty, and should be unobtrusive, even while in use. Perhaps most importantly, the system should not unduly burden or distract those viewers who are not using the interactive feature.
Accordingly, it is a principal object of the present invention to provide a video system that enables a remote video broadcast wirelessly to interact with a purchasable educational or entertainment device. Other important objects of the invention include the following:
(1) to provide an interactive video system that is compatible with conventional broadcast equipment and channels, and with conventional television receiving, recording and playback systems, including restricted bandwidth home recording and playback systems (2) to provide a system, as described, that minimi7es video and audio interference with program material;
INTERACTIVE VID~O M~T~OD AND APPARATUS
Backqround of the Invention This invention relates generally to interactive educational and entertainment systems, and more particularly to method and apparatus for data encoding a video signal at a remote broadcast site, decoding the signal at a reception site, and locally transmitting the data to control one or more interactive devices. The preferred embodiment of the invention is described in the context of television program control of toys located in a television viewer's home.
Videotext systems are known to be able to provide data communication from a remote video broadcast site to home television viewers over conventional broadcast channels. One such videotext system provides closed captioning of audio program material for the hearing-impaired, wherein the interpretive text is transmitted during vertical synchronization intervals of the raster ~can process. Only televisions that are specially equipped with decoders are able to display the captions, and the displaying of video text in synchronization with the television's raster scan electronics requires the physical interconnection of the decoder and the television, e.g.
an antenna hookup. Frequently, the payment of a subscription fee is required.
Attempts to provide systems capable of generalized, in-band data communications have met only marginal success.
This is because conventional in-band signaling is disruptive of the television's video image. For example, when data and pixel information are mixed in the same video field or frame, they are spa~ially separated to enable a light sensitive detector unobtrusively to monitor the data-encoded subfield. $ypically, this spatial separation is achieved by defining one or more ~ ~s ~
cells, each of which is first blan~ed and then reprogrammed with high and low luminance regions representing binary coded data.
Depending upon the size, number and coding of such data cells, the effective viewing area of the video program material is more or less adversely impacted. Such video data communications systems do not lend themselves to conventional broadcast channels, where subscribing and nonsubscribing television receivers alike will display the composite pixel and data information. Visual clutter that is visible on the television screens of nonsubscribers, or on the screens of subscribers who are not using their light sensitive detector at the time, likely will result in consumer complaints and FCC
restrictions.
It is desirable to provide an interactive video system capable of simplex data communications that is raster time-base error tolerant, and that requires no electrical connections to the television set. Such a system should be capable of communicating at a rate sufficient to control an interactive electromechanical device, e.g. an action toy, in real time response to the video program's story line. The system preferably would be compatible with conventional television broadcast, reception and recording equipment and channels. Reception equipment qhould impose little or no setup time,and difficulty, and should be unobtrusive, even while in use. Perhaps most importantly, the system should not unduly burden or distract those viewers who are not using the interactive feature.
Accordingly, it is a principal object of the present invention to provide a video system that enables a remote video broadcast wirelessly to interact with a purchasable educational or entertainment device. Other important objects of the invention include the following:
(1) to provide an interactive video system that is compatible with conventional broadcast equipment and channels, and with conventional television receiving, recording and playback systems, including restricted bandwidth home recording and playback systems (2) to provide a system, as described, that minimi7es video and audio interference with program material;
(3) to provide a method for subliminally encoding binary data, within the viewing area of a video program image, that is substantially invisible to a viewer of the television;
(4) to provide an interactive video system that easily and unobtrusively may be installed and operated;
(5) to provide interactive video educational and entertainment apparatus that permits the user to interact with a television program in real time;
(6) to provide a method for subliminally, digitally encoding data with a pre-recorded video broadcast;
(7) to provide a method for simplifying the decoder by substantially invisibly removing spurious data from the video input to the encoding apparatus prior to data encoding;
(8) to provide interactive video apparatus that requires no electrical connection to the television and that communicates with one or more purchasable, educational or entertainment devices; and (9) to provide an interactive video system that is convenient, reliable and inexpensive to use.
Summ ~ e Invention Method and apparatus are described that permit the remote control of interactive devices proximate to a conventional television receiver by the broadcast of composite video information thereto. The method consists of producing a composite video siqnal containing program material and control data by subliminal luminance and/or chromlnance modulation;
broadcasting the signal to a television; receiving the signal by the television; detecting the modulatlon, at the ~elevision, to reproduce the control data; and locally transmitting the control data to enable entertainment, educatlonal or other deviceæ within range of the transmission to respond to the program material in a predetermined manner. The remote control apparatus includes means for generating a signal containing control data; means for generating a slgnal containing a video program; means for modulating the video program signal by the control data signal in timed relation thereto, thereby producing a control data-modulated video subcarrier detectable as modulation in at least one predefined viewing area of the television; means at the television for detecting such modulation in the viewing area to produce a control data sequence; and means for controlllng, in predetermined response to the control data sequence, the actions of at least one entertainment, educational or other device.
The data encoding method of the invention involves modulatlng a video slgnal at frequencies that are related to multipleæ and submultiples of the horizontal line rate, to produce a subtle video subcarrier. Although the modulatlon is within the viewing area of the television screen, it remains substantially invisible to the viewer because of lts relatively low lntensity, it~ timed relation to the horizontal llne rate and the inherent integratlon and resolution characteristics of the human eye. In order to ensure the integrity of the data communication, whlle limiting the cost to users of the decoding apparatus, the signal-to-noise ratio of the communication is increased, in the preferred embodlment of the lnventlon, by the data encoder's removal of subcarrier components interpretable as data when a binary 0 is to be encoded, and by the addition of a subcarrier when a binary 1 is to be encoded (or vice versa).
, ., Those skilled in the art will appreciate that one or more such subcarriers may be data modulated to convey information, in serial or parallel, in a variety of ways, including, but not limited to, pulse modulation (PM), phase modulation (PM), amplitude modulation (AM), frequency modulation (FM), time or pulse interval modulation (PIM), frequency shift keying (FSK), return-to-zero (RZ), non-return-to-zero (NRZ), or any other of a variety of spatio-temporal moduIation and coding techniques.
In its preferred embodiment, the interactive video apparatus takes the form of an optical transducer, or light sensitive diode, that may be 'aimed' at the television screen and that is connected via a twisted pair cable to a compact, battery-powered receiver/transmitter device located nearby.
Receiver electronics reconstruct the control data by detecting the video subcarrier in the modulated video image and producing a bit-serial signal representing the control data. Transmitter electronics amplitude modulate an infrared (IR) carrier by the reconstructed control data and drive an infrared light emitting diode (IRED) array. One or more interactive toys, which may be separately purchased, detect the carrier, decode the command field within the control data, and initiate one or more actions in response thereto.
In a proposed modification to the preferred emb,gdiment, an antenna capable of intercepting radio frequency (RF) electromagnetic radiation and coupling it to conventional receiver electronics replaces the optical transducer and twisted pair cable of the preferred embodiment. It has been found that an inaudible, but detectable, low RF artifact of the data modulated video subcarrier is produced by the raster scan electronics of a television which is displaying the composite video signal described herein. While being of somewhat more limited range, i.e. the antenna must be located within a few ~ 24047-516 feet of, and in front of, the television screen, due to the relatively low energy level of the RF emanations, this alternative embodiment also yields certain advantage~. the antenna may be located closer to the screen of the television, as it needs no field of view; and the antenna is less Yusceptible to interference from spurious, visible light sources, e.g. the hlgh frequency emanations of a fluorescent lamp.
Thus, the various objects of the invention are achieved.
~ublimlnal luminance ~odulation within a viewing area of the television enables data encoded therein to be detected, while the modulation remains invisible to a television viewer. The optical transducer, which may be 'aimed' unobtrusively at the television screen from a range of distances and through a range of angles, semirigidly extends from the receiver/transmitter device, which may be affixed discretely to the side of the television receiver, thereby obviating conventionally required interconnections. The detector, or decoder is simplified and the data communication rendered more reliable by the data encoder's removal, prior to broadcast, of video features that otherwise would be interpretable aæ data. Infrared transmission between the recelver/transmitter device and interactive devices located in the room is wireless and inaudible, and imposes no burden on users or non-users of the interactive video apparatus. The encoding of selective successive fields of the video image with a serial bit stream of binary data achieves a data rate adequate to permit real time control, within or outside the context of the video program material, of multiple interactive devices. Parity error detectlon logic wlthin the interactive devices controlled thereby ensures data integrity so that the interactive devices reliably respond ln a predefined manner. The electronics of the ~ 24047-516 apparatus use conventional logic circuitry and fabrication methods, including very large scale integration IVLSI), thereby further enhancing the reliability of the system and reducing its cost.
Different aspects of the invention are described and claimed hereinafter.
One of these aspects may be summarized as in conjunction with a method for producing a composite video signal containing video program material and control data, and displaying the signal on a television and decoding such control data for ancillary use, an improvement compriæing modulating at least one video field within the viewing area of a televislon in such manner that the modulation is substantially invisible to the television viewer, thereby producing a video subcarrier component of the signal, the component containing the data; and detecting the component to reproduce the data for the ancillary use.
Another of these aspects may be summarized as apparatus for the remote control of interactive devices by the broadcasi of composite video information to televisions, comprising5 means for generating a program signal containing a video program; means for generating a data signal containing control data; means for subliminally modulating the program signal by the data signal in timed relation thereto, thereby producing a control data-modulated video subcarrier detectable as digital modulation in at least one predefined viewing area of at least one television; mean~ adjacent at least one television for detecting the modulation in at least one viewing area to produce a control data sequence; and means for controlling, in predetermined response to the data sequence, the actions of at least one of the interactive devices.
Still another of these aspects may be summarized as B
~ 3~ 24047-516 apparatus for the remote control of at leact one interactlve device by the production of composite video information containing program material and control data, the video information having been produced by modulating selected viewing areas of the program material with the control data to produce a video subcarrler component, the component containing the data, for viewlng the program material on television screens, comprising, means adjacent at least one of the television ~creens for detecting the control data modulatlon-produced video subcarrier component to reproduce the data, and means for communicating such reproduced control data to at least one interactive device.
Yet another of the6e aspects may be summarized as for use ~ith the production of a composite video signal containing video program material for diæplay on a television, the -composite video signal further containing a video subcarrier component that contains control data for the remote control of interactive devices located proximate to the television and for use with apparatus capable of detecting such component and decoding and communicating such control data, an interactive device comprising~ a receiver capable of receiving the control data communicated by such apparatus, and a controller capable of initiating a predefined action in response to such received control data.
A further of these aspects may be summarized as apparatus for the control of at least one interactive device by the presentation of composite video information containing program material and control data to at least one television for viewing thereon the program material, the video information being produced by modulating the program material, within a viewing area of the television, with the control data to produce a video subcarrier capable of indicating the presence 7a r{ g . ~
,' i; "3 i) 2 4 0 4 7 - 5 1 6 and sense of the control data, comprising: means proximate to the television for detecting the subcarrier to reproduce the data, and means responsive to such reproduced data for controlling at least one interactive device.
The invention will now be described in greater detail with reference to the accompanying drawings.
Brief Descri~tion of the Drawinas Fig. 1 shows the use of an interactive toy system made in accordance with the preferred embodiment of the 10 invention.
- Fig. 2 schematically illustrates the novel luminance modulation method of the invention.
Fig. 3 schematlcally illustrates, in block diagram form, the vldeo receiver/IR transmltter electronics of the interactive apparatus.
Fig. 4 schematically illustrates, in block diagram form, the receiver electronics of an interactive toy.
Fig. 5 schematically illustrates, in block diagram form, the video encoding electronics of the invention.
Detailed DescriPtion of the Preferred Embodiment Fig. 1 is a pictorial representation of the use of the interactive video apparatus of the present invention. A
remote televlslon broadcast antenna 10 is shown broadcasting composite video information, or a composite video signal that contains video program material and control data, indicated by dash-dot-dot llne 12, to a televlslon 14. Antenna 14_ of television 14 picks up the remote broadcast and displays it on the screen, indicated generally at 14b. For the purposes of thls discussion, screen 14_ may be thought of as having a 30 program viewing area 14_, which generally is coextensive wi~h 7b .
~w ~ 24047-516 screen 14b, that includes representative area 14d, which will be used in reference to Fig. 2 schematically to illustrate the novel data encoding method of the invention. For illustration purposes only, and so that it will ~e appreciated how the interac~ive video apparatus may be used with entertainment devices, the video image of a car speeding past an intersection is shown as the prominent feature of the television program being displayed.
An optical transducer 16, having a light sensitive diode 18 on one end of a semirigid, twisted pair cable 18_, may be 'aimed' at viewing area 14_ from a distance, preferably greater than six inches, and at an angle, preferably greater than thirty degrees. In the preferred embodiment, cable 18a is rigidized by integrally molding cable 18_ with a stiff wire, using a suitable, elastomeric compound. Thus, once transducer 16 is positioned to point at viewing area 14c, its position is maintained thereafter until repositioned by the user. The other end of transducer 16 is connected to a translator, or receiver/transmitter device 20, which may be located adjacent television 14, e.g. atop or therebeside, and which may be affixed, for example, by the use of loop-and-pile textile (not shown). Transducer 16 coupled luminance modulation within its view to detecting means (not shown in Fig. 1, but shown in Fig.
3 and described in reference thereto) within receiver~transmitter device 20. Device 20 lncludes receiver/transmitter electronics mounted on a circuit board 22, and a front panel 24. IREDs 26, 28, 30 are mounted to printed circuit board 22, and extend to a position along front panel 24, enabling them to emit infrared energy generally in the direction shown by dash-dot lines 32a, 32b, 32c. It will be appreciated that any desirable number of IREDs may be used, depending upon the current capacity of the drive electronics ~ ~ h ~ 24047-516 and the desired transmission range.
An interactive device, such as car 34, within range of IREDs 26, 28, 30, contains light responæive means, or llyht sensitive diode 36 mounted on a printed circuit board 38 within car 34. In a manner that will be described below, blnary data may be encoded in viewing area 14c which data, although invisible to a viewer of the television, nevertheless is detectable by receiver/transmitter devlce 20 by the coupllnq of lumlnance modulation within viewing area 14c via transducer 16.
Receiver/transmitter electronics within device 20 reconstruct the control data from the luminance modulatlon, and transmit it to car 34. Car 34, responsive to a command embedded in the control data, initiates a predefined action. In the illustration, car 34 imitates the display activity, or mimics the action of the car in the television program by starting its motor and accelerating.
It will be appreciated that the interactive device may be any educational or entertainment device or the like capable of responding in a prescribed manner to control data that is transmitted as infrared energy within a proper frequency range. The potential uses for the interactive video apparatus described herein are virtually limitless. It also will be appreciated that the source of the composite video signal containing video program material and control data need not be remote broadcast antenna 10, as illustrated in Fig. 1, but rather may be a videocassette player conventionally connected to television 14 and either playing a pre-recorded videocassette tape or receivinq such a remote broadcast for local display on television 14 or other video monitor.
In a proposed modification to the preferred embodlment of the invention, transducer 16 takes the form of any of a variety of conventional RF antennas capable of .: 9 .
coupling low RF electromagnetic radiation emanating from television screen 14b to receiver/transmitter device 20. In the lnterest of 9a ~ '3~
illustrative brevity and clarity, Fig. 1 may be interpreted as showing this alternative embodiment, with the only difference being that light sensitive diode 18 and twisted pair cable 18a straightforwardly are replaced by a rigid conductor, similarly located and similarly oriented, which may be dimensioned and shaped, as is well-known, to provide adequate RF sensitivity.
Whereas light sensitive diode 18 of the preferred embodiment may be located a substantial distance from television screen 14b, but preferably greater than six inches therefrom, the effective range of the antenna of the proposed modification is both smaller and closer, i.e. the antenna preferably is located within a few feet of, but not in contact with, the television screen.
Turning next to Fig. 2, the novel method of encoding data within viewing area 14c of Fig. 1 schematically is illustrated. Detail A shows representative area 14_ in the absence of brightness modulation; detail B shows, in substantially exaggerated form, representative area 14_ in the presence of luminance modulation. For the sake of clarity and subject to graphic arts constraints, details A and B are shown with greatly exaggerated vertical spatial separation between horizontal scan lines, and with greatly exaggerated luminance modulation. Nevertheless, the illustrations are deemed instructive of the novel luminance modulation method proposed herein.
In detail A, relatively low luminance horizontal scan lines are represented by lines such as line 40. Relatively high luminance horizontal scan line segments are represented by relatively wider lines, such as line 42. In this way, high luminance features, such as those shown within area 14d of Fig. 1, contrast with the nominal luminance background areas of the moving picture frame captured illustratively in Figs. 1 and s~ ~
2. It will be appreciated that the line widths chosen for illustration purposes are representational only, and generally do not represent the actual scan line widths or spacings visible at this scale within viewing area 14c. It will be understood, in reference to Fig. 2, that the horizontal lines of details A
and B are non-interlaced, and represent the lines in a single field, rather than a line-interlaced frame. By modulating alternate lines within consecutive fields, data may be encoded for transfer at the television's field rate, e.g. 60 Hz in the case of National Television System Committee (NTSC) television broadcast.
Detail B illustrates the effect, within area 14d, of luminance modulating viewing area 14c, as depicted in detail A.
By alternately raising and lowering the luminance of adjacent horizontal scan lines within viewing area 14c, a video subcarrier is produced that is detectable by opto-electronic means, while the spatial relationship among picture elements within viewing area 14_, the luminance across viewing area 14c and the contrast between relatively high and relatively low luminance features within viewing area 14c are preserved. Thus, the background now contains alternately raised and lowered luminance horizontal scan lines 44 and 46, respectively. That is, raised luminance lines, represented by line 44, are at a luminance level slightly higher than that of line 40 of detail A, and, complementarily, alternate lines, represented by line 46, are at a somewhat lower luminance level compared to corresponding lines 40 of detail A. Corresponding to relatively high luminance feature lines 42 of detail A are rai~ed luminance lines, such as 48, and lowered luminance lines, such as 50.
As represented in Fig. 2, the luminance modulation, which enables the detector, to be described below, to detect and decode the binary data encoded by the preferred method of the ~ 0~7-516 invention, result~ in the alternate raising and lowering of the luminance levels of the horizontal line~ shown in detail A.
Although this modulation i5 exaggerated in detail ~ (and represented by line width, rather than line intensity, modulation), for illustrative purposes, it is apparent from details A and B that the overall average luminance of, and contrast between, the video features and the background within viewing area 14c are preserved.
Focuælng attention now on areas 52, 54 of Fig. 2, lt will be appreciated that, even in the presence of luminance modulation wherein a binary 0 or 1 may be coded, the spatial relationship among picture elements within an arbitrarily small region of viewing area 14c is preserved. For example, even if areas 52, 54 were reduced to embrace only two adjacent horizontal scan lines of viewing area 14c, the overall luminance within region 54 would be the same a~ that within correspondlng region 52. This is by virtue of the novel, alternate line, proportionate modulation scheme of the present invention, wherein the percentage by which one line's luminance is raised is equal to the percentage by which an adjacent line's luminance ls lowered. Those skilled in the art will understand that the same method may be applied to the chromlnance signal to produce a detectable, but subliminal, data modulated chrominance subcarrier.
Importantly, horizontal scan lines withln a field of the true video image, represented only schematlcally in Fig. 2, are closely spaced, so that any coarseness resulting from alternate line luminance modulation is substantially invisible to the viewer of television 14. In the practice of the preferred method of the invention, the peak-to-peak percentage modulation that, although virtually invisible to the viewer, nevertheless is detectable by opto-electronic means, is , ~ ,, .
v~ ~ o approximately 10 percent, or less than one half of the apparent modulation illustrated schematically herein.
It will be appreciated that the alternate line, proportionate modulation scheme described immediately above is only one of many subliminal, data encoding methods within the scope of the invention. Obviously, adjacent pairs, triplets, etc. of horizontal lines alternately may be proportionately luminance modulated, while still preserving the overall luminance of, and contrast between, the video features and the background within viewing area 14c. As will be described, in reference to Figs. 3 and 5, corresponding changes to the period and frequency of various filters and delay lines are all that would be required to accommodate ~uch a modification to the modulation scheme. It also will be appreciated that subliminal modulation within viewing area 14c of television 14 may be performed in such manner that multiple subcarriers simultaneously are present therein. In this way, more than one binary bit of data may be conveyed to, and detected by, transducer 16 within a single video field to achieve a data rate that is greater than the television's field rate. Higher data rates also may be achieved by the division of viewing area 14_ into multiple regions, each of which is subliminally modulated to encode one or more binary bits of data. Multiple transducers, such as transducer 16, may be 'aimed' within the separate regions and a decoder circuit, responsive to the transducers, may detect and decode the binary data presented in parallel to television 14.
Turning next to Fig. 3, a block diagram of the receiver/transmitter electronics capable of detecting, decoding, and transmitting binary coded data from television 14 to interactive toy 34 is described. Detecting means includes transducer 16 which is 'aimed' at screen 14_; light sensitive means, such as diode 18, which optically couples luminance within its view, via cable 18a, to a detector, or receiver electronics; and receiver electronics 56, which produce a control data sequence for the control of an interactive device.
Receiver electronics 56 analyze the electrical signal for energy within a range around 7.867 kHz, which is one half of the NTSC
nominal ~color) horizontal line frequency within a field, and is, therefore, the frequency at which luminance is modulated in viewing area 14_ of the television screen. In the presence of luminance modulation within this range of frequencies, the output of receiver electronics 56 represents a binary 1 or 0, indicating the presence and sense of control data intended for ancillary use by, e.g. an interactive device.
Receiver electronics 56 include amplifier 58, the gain of which is determined by feedback resister Rf, the value of which may be determined by well-known methods dual, series band-pass filter/amplifiers 60, 62, both tuned to pass, and somewhat amplify, energy in a range about 7.867 kHz and each having a selectivity, or Q, of approximately 10; full-wave rectifier 64, the output of which is smoothed by capacitor C;
and level comparator 66, which compares the smoothed output of rectifier 64 with a predefined reference voltage to determine whether the 7.867 kHz energy is, in fact, encoded data, rather than,incidental, video noise. It will be appreciated that filter/amplifiers 60, 62 may be combined into a single stage amplifier yielding similar gain and selectivity.
Level comparator 66, which may be thought of as being of high gain, but limited dynamic range, compares the smoothed output of rectifier 64 preferably for a period of time greater than the period of several horizontal lines, thereby ensuring against a false indication of the presence of encoded data within a field that happens to have adjacent horizontal lines of ~ h ~ 24047-516 different luminance, e.g. a horizontal boundary between high and low luminance features of a video image. In the preferred embodiment, the time period over which comparator 66 is active is approximately equal to the time it takes the raster scan electronlcs of television 14 to traverse fifteen horizontal lines. The output of comparator 66 is bistable, having a first, active state during an interval of time, preferably greater than one millisecond (corresponding to the presence of luminance modulation), and having a second, inactive, statè at all other times. Thus, detecting means produces a control data saquence by the continuous monitoring of lumlnance modulation within viewing area 14c of television 14.
It will be appreciated that band-pass filter/-amplifiers 60, 62 may be centered on frequencies other than 7.867 kHz, to correspond with the luminance modulatlon frequency at which data i5 encoded. It also will be appreclated that multiple detecting means may be provided, within the spirit of the invention, wherein each is capable of detecting luminance modulation within distinct frequency ranges representlng multiple, binary data bits.
Referrlng still to Fig. 3, it is seen that means for wirelessly communicating the control data to an interactive device includes an IR modulator 68, which modulates a 32 kHz carrier by the bistable output of comparator 66, and drives an IRED array consisting, in the preferred embodiment, of three IREDs 26, 28, 30. IREDs 26, 28, 30 are mounted to printed clrcult board 22 and supported by front panel 24 (refer to Fig.
1), and emit IR energy generally in the direction shown by dash-dot lines 32a, 32b, 32c, thereby pro~ecting, into a projection field, encoded light-borne information derived from such control data. It will be appreciated that the carrier may be of any frequency, but is preferably of a frequency above the audible range to avoid undesirable acoustic coupllng, and i preferably distinct from the carrier frequencies of other devices, e.g. the remote control device that wirelessly operates the television.
It will be appreclated that the receiver/transmitter electronics shown in Fig. 3 require no synchronization with the raster scan tlming of television 14. They require no electrical connection whatsoever to television i4 or antenna 14a. It will be appreciated further that the receiver/-transmitter electronics of device 20 are, in the preferredembodiment, battery-powered, thereby eliminating the necessity of supplying AC power thereto. The mere presence of subliminal luminance modulation of the proper frequency anywhere within viewing area 14c, coupled by transducer 16 to receiver ~ . .
electronics 56, enables the electronics within device 20 to discriminate control data from random video patterns. Thus, the invention enables subllminal, in-band data communication at a data rate greater than, egual to or less than the field rate of a conventional televi~ion, without the necessity of internal or external hookups.
It will be understood by those skilled in the ar~
that when an antenna, rather than a light sensitive diode, is used to couple the data-modulated video ~ubcarrier to receiver/transmitter 20, in accordance with a proposed modification to the preferred embodiment of the invention, receiver electronics 56 need be changed only to the extent that the input to buffer amplifier 58 will be the signal received by the antenna, rather than that produced by light sensitive diode 18, and minor adjustments desirably may be made, as is well-known, to the gain and selectivity of filter/amplifiers 60, 62and/or the reference voltage of level comparator 66.
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Turning now to Fig. 4, receiver electronics within an interactive toy, such as car 34, are illustrated. Projected information in the form of IR energy, such as that shown by dash-dot line 32a, i5 æhown incident upon a receiver adapted to receive such projected information when within such field. In the receiver, whlch include~ llght responsive means and carrler detecting means, selectively IR light responslve means includlng light sensltlve 16a L ~
diode 36 produces a signal that is routed to carrier detecting means, or a conventional IR preamplifier circuit of the type commonly found in wireless, remotely controllable televisions.
Generally, IR preamplifier 70 includes a buffer amplifier 72, an amplifier 74 tuned to the carrier frequency of IR modulator 68, a full-wave rectifier 76 and a level comparator 78.
Preamplifier 70 transforms amplitude modulated, 32 kHz IR energy 32a that is incident upon light sensitive diode 36 into a demodulated, digital signal. This digital signal represents the bit-serial data that was detected as luminance modulation at television 14, in what will be understood to be an RZ, binary-coded format. In other words, the binary ls and Os representing the data are separated in time by null, or inactive periods, during which the level of the digital output of comparator 78 would be, by high-true convention, a logic 0.
In the preferred embodiment, control data that are encoded by luminance modulation for broadcast to television 14 are formatted in an asynchronous, or start/stop, protocol. In this well-known format, which is compatible with conventional universal asynchronous receiver/transmitter (UART) chips and communications line monitoring and data logging equipment, data may be represented by a five- to eight- bit code preceded by a start bit, optionally succeeded by a parity bit and succeeded by a stop bit. Although in the preferred embodiment of the invention the data field is five bits long and a parity bit is used to ensure data integrity, it will be appreciated that any predetermined number and arrangement of bits within the control data may be used.
It also will be appreciated that, within the data field representing command/address information intended to activate an interactive device, the command/address information may be encoded in a variety of ways. In the preferred embodiment, the first three of the five data bits are alway~ a binary 1, and the remaining two bits are reserved to convey predefined command information to an interactive device in a manner that will be described.
The digital output of comparator 78, which represents an RZ, binary-coded, control data se~uence, is latched, validated and decoded by latch/decode logic 80, which is clocked at the data rate, e.g. 60 Hz. As consecutive bits, includlng a start bit, a parity bit and a stop bit of predefined logic levels, are clocked into a controller, or latch/decode logic 80, the control data field is validated as containing command/address information. When they have been validated as being properly framed by a start and stop bit and as being of correct parity, the five bits of command/address information, or information-related control signals are enabled onto bus 82, which is routed to various activity-producing means (not shown) e.g. a motor within an interactive devtce, such as car 34.
It will be understood that latch/decode logic 80 may be implemented in any of a number of well-known digital logic circuits. For example, a shift regiæter may be used to accumulate successive control data bits, and any of various clock recovery schemes may be used to deflne a signal the edge of which clocks successive bits of control data into the shift register. Or, for example, by inverting and stretching the output of comparator 78 to a duration of greater than one half of a bit time, e.g. by the use of a monostable multivibrator, a UART may be used to implement the latch/decode logic, by supplying a clock at a ra~e equal to 16 times the data rate.
It will be appreciated that, by the use of a UART, binary data are automatically validated (as against parity and framing errors) and are latched for their parallel presentation onto l u ~
data bus 82. In the preferred embodiment of the invention, latch/decode logic 80, as well as IR preamplifier 70 circuitry, is implemented in a custom VLSI chlp, thereby substantially reducing the cost and increasing the reliabillty of car 34.
It wlll be appreciated that the addreæs/command fleld of the control data may be of any length, and may be encoded in a number of ways, depending upon system requirements, e.g. how many interactive devices need be addressed and how many commands each need comprehend. Further, it will be appreciated that, by comparing the address field to one or more predefined values, particular interactive devices, within the user's home, having address responsive means selectively may initiate the action indicated by the command field when the address field and one or more such values are equal. For example, the address/command field may be assigned a mode control bit that determines how the remaining bits will be interpreted by an interactive device. In the case of a large number of relatively limited capacity interactive devices, most of the remaining bits may be reserved to address, and a relative few to command. In the case of fewer, more capable interactlve devices, most of the remaining bits may be reserved to command, and a relative few to address. In this way, a flexible system may be designed in which interactive devices of varying number and capability are accommodated within an address/command field of any desirable length and respond only to preassigned, device-specific addresses.
A particular interactive device ie, in the preferred embodiment, hard-wired to respond in a predetermined way to control data received thereby to generate data-related device activity, thus to coordinate device activity with display actlvlty. It will be appreciated that it instead may be programmed, or read-only memory-(ROM-)controlled, so that the response~ more readily may ~e changed. The actions initiated by one or more interactive devices might include motor;
: steering; headlight; siren; ~peech synthesis; or numerous others. In the case of an interactive device that is not an 19a o action toy, successive command fields may represent, for example, American Standard Code for Information Interchange (ASCII) text that may be displayed on a lap-top display device, or Musical Instrument Digital Interface (MIDI) data that may be used to control a musical instrument. Thus, the particular application illustrated in Fig. 1, wherein the interactive device is toy car 34, is merely one of numerous uses of the novel interactive video apparatus of the present invention.
Turning finally to Fig. 5, the preferred embodiment of the encoding electronics used to produce a data-encoded, composite video signal for remote broadcast, illustrated in block diagram form, is indicated generally at 84. Encoding electronics 84 best will be understood as a modification to what is known as a video processing amplifier, commonly used in the context of video broadcasting to ensure that videotapes conform to broadcast quality, format and other regulatory requirements.
First, those portions of the diagram which relate to the production of a composite video signal containing video program material and control data will be described. Second, a video preview circuit will be described that enables a videotape to be viewed, prior to data encoding, to determine the suitability of the program material for luminance modulation. Finally, a data remove circuit, which permits a previously data-encoded videotape to be restored to its pre-encoded condition, will be described.
Indicated at 86 are the functional blocks that, in the preferred embodiment of the invention, implement the luminance modulation, data encoding scheme. Data encoder 86 includes an input buffer 88 into which means (not shown) for generating a program signal feed video program material. A
chroma separator 90 extracts the chrominance component of the conventional color-composite signal, while sync separator 92 r - ~
extracts the synchronization component therefrom, allowing only the luminescence component to reach video/data mixer 94. The only other input to mixer 94 (with the REMOVE DATA switch open) is the control data to be mixed with the video program material.
Means for generating a data signal, e.g. computer means (not shown), present control data bit-serially to the D
input of a flip-flop 96, where the logic level, representing a 1 or a 0 to be encoded for broadcasting, is synchronized with the VERTICAL SYNC signal having a frequency equal to the field rate.
The synchronized output of flip flop 96 is ANDed at 98 with the 50~ duty cycle output of a flip-flop 100 the toggle input of which is the HORIZONTAL SYNC signal. A blanking protection, or blank protect circuit 102 level clamps the output of AND gate 98 to ensure that the normal video synchronizing signals, HORIZONTAL SYNC, VERTICAL SYNC and chroma reference, which are transmitted during the blanking intervals, are not disturbed by data modulation. Circuit 102 also biases the output of AND gate 98 to have approximately equal positive and negative excursions, in order to provide proportionately raised and lowered luminance when the control datum is a binary 1, and to make no contribution to the luminance output of mixer 94 when the control datum is a binary 0.
A 'white' and 'black' clipper circuit 104 ensures that, after the mixing of program material and control data in mixer 94, maximum 'white' and minimum 'black' levels are not exceeded. A second mixer 106 recombines the chrominance and luminescence signals, producing a signal that is blanked, during horizontal retrace, in blank adder 108.
Referring still to data encoder 86, circuitry is illustrated the operation of which is well-understood by those skilled in the art including: burst amplifier 110; burst phase adjust 112; chroma processor 114; clamp 116; sync processor 118;
~: ~3 i~0 clamp and blank generator 120 final stage amplifier and mixer 122; sync amplifier and driver 124, which produces a signal called SYNC OUT; and output driver 126, which provides the VI~EO
OUT signal. Thus, data encoder 86 provides means for modulating the program signal by the data signal in timed relation thereto, thereby producing a control data subcarrier.
Referring still to Fig. 5, a video previewer, indicated at 128, is described in detail. The purpose of previewer 128 is to provide a method of previewing video program material, field by field, for its suitability in the luminance modulation, data encoding scheme of the preferred method.
Previewer 128 permits the identification of a sequence of consecutive video fields each of which contains, in the window circumscribing the viewing area to be encoded, high and low luminance respectively below and above a corresponding threshold level. Similarly, previewer 128 permits a videotape containing the 7.867 kHz video subcarrier to be identified as either already having been data-encoded or as containing video features which would be detected as encoded data when, in fact, they are not. By well-known field tagging techniques, fields that are either too 'white' or too 'black' effectively to be luminance modulated, or fields containing video features that would appear to be data, may be identified by their time code sequence numbers and may be excluded as candidates for data encoding.
Those skilled in the art will appreciate that the addition of an appropriate video delay between previewer 128 and encoder a6 i.e. a delay longer than the predefined control data word length, would permit videotapes to be previewed, tagged and data encoded in a single pass or playback period.
By reference to video previewer 128, it first will be seen that video program material is delayed, in the preferred embodiment, by one horizontal line through an ultrasonic delay '.i J~
line 130. The resulting signal is then inverted through analog inverter 132 ~assuming that the TEST 2 switch is closed), and mixed with an undelayed version of the same program material signal in adjustable phase mixer 134, in what may be thought of as a double-line correlator. A 250 kHz, low-pass filter 136 removes undesirable, high-frequency artifacts of horizontal delay line 130. The output of filter 136 is clamped at 138 (while VERTICAL SYNC iS active) and sampled, during the traversal of the windowed portion of the field being analyzed, as this is the only time of particular interest. A 7.867 kHz band-pass filter 142, a full-wave rectifier 144, an integrator 146 and a reference voltage comparator 148 produce a binary signal, DATA PRESENT, when the windowed field being analyzed contains what appears to be encoded data.
It will be understood that WINDOW, which defines the perimeter of an included subfield of the viewing area in which video program material and control data will be mixed, is used to switch gate 140 and, via clamp 150, to define the period over which the subcarrier is integrated. It will be understood that 20 WINDOW may be produced by a combination of horizontal sync, vertical sync and a pattern generator (not shown), which may be defined by a programmable read-only memory (PROM) or other microcontrol device (not shown). Notwithstanding the fact that, in the preferred embodiment, the subfield circumscribed by ~.;, WINDOW is the entire viewing area 14c of television 14, it will be appreciated that a proper subfield -- of lesser area than viewing area 14c -- may be defined, within the spirit of the invention, and its boundaries blended, by use of a ramp generator, to avoid a perceptible difference between the unmodulated and modulated regions of viewing area 14_ at the interface therebetween. It will be appreciated that the luminance modulated subfield need not be rectangular, or of any I.~h~
fixed shape, but rather may be amorphously defined under the pseudorandom control of a pattern generator. Importantly, the preferred method and embodiment of the invention avoid the boundary problem by luminance modulating the entire viewing area 14_ of television 14.
The video program material signal is clamped at 152 and, via gates 154, 156, is sampled for the duration of the WINDOW signal. The output of gate 154 is peak detected at 158, clamped at 160 (while VERTICAL SYNC is active) and compared at 162 to a predetermined 'white' luminance maximum, thereby producing a signal, TOO WHITE, that indicates whether the luminance within the subfield is too high detectably to be luminance modulated with data. Complementarily, the output of gate 156 is peak detected at 164, clamped at 166 (while VERTICAL
SYNC is active) and compared at 168 to a predetermined 'black' luminance minimum to produce a signal, TOO BLACK, that indicates whether the luminance within the subfield is too low detectably to be luminance modulated. It will be understood that TOO
WHIT~, TOO BLACK may be monitored by computer means (not shown) to tag the corresponding subfield as being either of too high or too low a luminance. During the data encoding process, such fields may be avoided, and a more suitable, but equally timely, sequence of fields may be encoded with control data. In an alternative embodiment, such fields might be rendered suitable, rather than avoided, by computer means, e.g. by modifying video levels such as gain and pedestal.
Delay line 130, which in the preferred embodiment imposes approximately a 63.556 ~s delay, which is the NTSC
nominal horizontal line period, permits the inverse of the instantaneous luminance of the previous horizontal line to be added to the instantaneous luminance of the present line, in mixer 134, producing thereby an instantaneous luminance ~ 3~
difference between the two adjacent lines. In the presence of luminance modulation at or about the 7.867 kHz frequency, the signal representing this difference will contain a substantial subcarrier component that may be detected at the output of comparator 148. It will be appreciated that the data present circuit of video previewer 128 is similar in many respects to receiver electronics 56, illustrated in Fig. 3, in that it seeks to detect a threshold video energy level at one half of the NTSC
horizontal line frequency. It also will be appreciated that video delay line 130 may be implemented in alternative devices, e.g. charge-coupled device (CCD) shift registers.
Referring still to Fig. 5, it is noted that a data remover is indicated at 170. Generally, data remover 170 may be thought of as a triple-line correlator. In the presence of the 7.867 kHz video subcarrier as among three, adjacent, horizontal scan lines, data remover 170 produces an inverted subcarrier of equal amplitude, used in mixer 94 ~when the REMOVE DATA switch is closed) to cancel the detected subcarrier. As shown in Fig.
5, when data remover 170 is used, video program material is preprocessed thereby before being inputted to data encoder 86 and video previewer 128, thereby enhancing the suitability of fields for modulation while substantially invisibly impacting the program material itself.
.,~ VIDEO IN is routed to a test mixer 172 the other input of which normally makes no contribution (with the TEST 1 switch open). Mixer 172 provides a video signal that is delayed by one horizontal line through a 63.556 ~s delay line 174, further delayed, for reasons that will become apparent, by a compensatory delay circuit 176 and then inputted to buffer 88 of data encoder 86 and to delay line 130 of previewer 128. The output of mixer 172 is inverted by analog inverter 178, whose current output is limited by resistor Rl before it is inputted 1 ~ rJ ~
to mixer 180. This first input to mixer 180 may be thought of as contributing minus one fourth of the present horizontal line's instantaneous luminance. The current output of delay line 174 is limited by resistor R2, and becomes a second input to mixer 180. This second input to mixer 180 may be thought of as contributing plus one half of the instantaneous luminance of the previous horizontal line. The output of delay line 174 also is inputted to a delay line 182, the current output of which is inverted at 184 and limited by resistor R3, thereby forming the third input to mixer 180. This final input to mixer 180 may be thought of as contributing minus one fourth of the instantaneous luminance of the horizontal line 1mmediately preceding the previous horizontal line.
It will be seen that the output of mixer 180 represents a weighted sum of the instantaneous luminance of three adjacent horizontal lines of VIDEO IN. In the presence of a video subcarrier at or about the 7.867 kHz frequency, the output of mixer 180 represents the inverse of the present horizontal line's luminance modulation component. This is because, as among any three adjacent horizontal lines within a data-encoded subfield, 1) one will be raised and two will be lowered in luminance, or 2) two will be raised and one will be lowered in luminance. Three adjacent horizontal lines, therefore, definitively enable the detection of a subcarrier at VIDEO IN. It will be appreciated that the weighted sum of the three inputs to mixer 180 is equal to the average amplitude of the luminance modulation between any two adjacent lines, which in the absence of luminance modulation is zero.
Those skilled in the art will appreciate that, whereas it has been found that the double-line correlator of video previewer 128, and the triple-line correlator of data remover 170, respectively enable the detection, and the removal, of encoded data or spurious data components of VIDEO IN,alternative embodiments are within the spirit of the invention.
For example, an n-line correlator may be used to increase the sensitivity of the circuits to the presence of a subcarrier component, thereby to enhance the ability of video previewer 128 to detect, or of data remover 170 to suppress, encoded or spurious data. Straightforwardly, an n-input mixer may produce a weighted sum of incrementally delayed video inputs so that, in effect, previewer 128 or remover 170 takes a wider, n-line 'view' of VIDEO IN. Thus, the 36 db rejection ratio of the triple-line correlator, for example, may be increased by cascading n delay lines and defining their relative plus or minus contributions to the weighted sum in such manner that the sum is zero when no subcarrier of a particular freguency is present.
It also will be appreciated by those skilled in the art that delay lines, such as delay line 174, may, within the spirit of the invention, assume values other that 63.556 ~s.
Generally, delay lines are specified to impose a delay nominally equal to one half of the inverse of the subcarrier modulation frequency, as is the case in the preferred embodiment described herein. Due to the general applicability of the subliminal modulation method of the invention, of which the alternate, proportionate raising and lowering of the luminance of adjacent horizontal lines is merely one example, the subcarrier frequency may be higher or lower than 7.867 kHz, and the delay lines may impose a respectively lower or higher video delay.
Referring still to Fig. 5, it will be seen that the output of mixer 180 is filtered at 186, to eliminate undesirable, high-frequency components, including the NTSC
chrominance subcarrier component nominally at 3.579 MHz, and is inverted at 188 for presentation, via REMOVE DATA switch 190, to 1P~ J jJ~
video mixer 94. It will be understood that, due to the inherentpropagation delay of the output of mixer 180 through filter 186, a compensating delay of the output of delay line 174 must be imposed, in order to ensure the synchronized arrival of inputs to video/data mixer 94. If VIDEO IN contains video features that, to the detector, would appear as luminance modulation, i.e. if VIDEO IN contains spurious data or if VIDEO IN in fact contains encoded data, then the modulation component of the present horizontal line effectively will be purged, or cancelled, by adding in mixer 94 a signal of equal amplitude to, but of opposite sign from, the modulation component. Thus, the video output of output driver 126, by the operation of data remover 170, contains video program material only, rather than the combination of video program material and a luminance modulated subcarrier or video features detectable as spurious data.
When it is desired to remove data from a previously data-encoded videotape, as determined, for example, by previewing the videotape and monitoring DATA PRESENT, the user need only close REMOVE DATA switch 190, process the encoded videotape through encoding circuit 84 and record VIDEO OUT on a blank videotape. In this novel way, the data encoding process enabled by the apparatus of the present invention may be reversed to restore videotapes so processed to their prior, unencoded condition. By the inclusion in encoding circuit 84 of video previewer 128, data encodsr 86 and data remover 170, videotape masters may be previewed and data encoded or restored, based upon the DATA PRESENT tagging of subfields therein. It will be appreciated that data encoder 86 and data remover 170 alternatively may be used simultaneously 1) to remove unwanted video features that are detectable as spurious data or an 5 ~
unwanted modulated subcarrier, and 2~ to add the desired modulated subcarrier.
It is possible to test video previewer 128 and data remover 170 by injecting a 7.867 kHz signal into the second input of mixer 172 via TEST 1 switch 192. It will be appreciated that if a 7.867 kHz subcarrier is injected at mixer 172, then DATA PRESENT will indicate the presence of this pseudo-data subcarrier. Similarly, it will be appreciated that if a 7.867 kHz subcarrier is injected at mixer 172, and if REMOVE
DATA switch 190 is closed, then although DATA PRESENT will be active, nevertheless VIDEO OUT will contain no subcarrier component, due to the difference producing effect of data remover 170 and the cancelling effect of mixer 94. It will be understood that, were TEST 2 switch 194 open, video previewer 128 still would indicate the presence of data but, because it would depend upon simple line detection (as do receiver electronics 56) rather than dual-line correlation, previewer 128 would exhibit a lower signal-to-noise ratio. Finally, TEST 3 switch 196 permits the loop back testing of video previewer 128 and data remover 170, by presenting video program material to delay line 130 (when switch 196 is in its OFF position), or by presenting VIDEO OUT to delay line 130 (when switch 196 is in its ON position).
The preferred method of the present invention now may be understood, in light of the apparatus described herein. By luminance modulating alternate horizontal scan lines of successive video subfields within the viewing area of a television in a manner that the modulation is substantially invisible to the television viewer, a composite video signal containing video program material and control data may be produced, e.g. by the use of encoding circuit 84. By detecting the video subcarrier component, as, for example, by detecting ~ ;S~v~ 3means including transducer 16 and detector 56, the encoded data may be reproduced, at or near the television but asynchronously relative to the raster scan timing thereof, for ancillary use, e.g. to control an interactive device.
The composite video signal containing the video program material and the control data may be produced by identifying, as by tagging and logging, a sequence of consecutive fields that are suitable for data encoding, e.g. by the use of video previewer 128. Optionally, e.g. by the use of data remover 170, fields containing encoded or spurious data may be purged of the video subcarrier, thereby rendering them suitable for data encoding, e.g. by the use of data encoder 86.
The formatting of a binary data sequence, e.g. by the uqe of computer means that has access to the DATA PRESENT, TOO WHITE
and TOO BLACK signals, permits the control data sequence to be fitted within the identified field sequence. After generating synchronization signals defining a window that circumscribes an included video subfield, program material and control data may be mixed, within the window and in response to the signals, by luminance modulating the program material with the control data.
It will be appreciated that, while analog means of previewing, encoding and restoring videotapes are described herein, nevertheless the use of digital means, e.g. by the manipulation of gray scale-coded pixels within a frame buffer, is within the spirit of the invention.
Broadcasting the composite video signal produced by the steps described immediately above enables one or more televisions to receive the signal, enables detecting means proximate thereto to reproduce the data, and enables an IR
modulator and IR~D array locally to transmit the data, causing interactive devices to respond to the data-encoded program material. In the preferred method of the invention, the detecting is performed by locally optically coupling themodulation, e.g. via transducer 16, to receiver electronics, wherein the program material is discriminated from the control data. By amplitude modulating an IR carrier with the control data, the latter inaudibly and wirelessly may be communicated to interactive devices within range of the transmission.
The advantages offered by the invention should be apparent to those skilled in the art. The method and apparatus disclosed herein enable subliminal, in-band, data communication over conventional television broadcast channels, for ancillary use at a site local to the home television viewer. Detection apparatus, including an optical transducer which unobtrusively monitors any desired region within a program viewing area of the television screen, enables receiver/transmitter electronics to discriminate control data from random video noise, and locally to transmit the control data to one or more interactive devices within its IR transmis~ion range. Such interactive devices flexibly may be programmed to initiate predefined actions in response to the television program's story line. The apparatus requires no electrical connections to the television receiver or antenna, and wirelessly, remotely controls interactive devices within a television viewer' 5 home. Interactive devices that remotely may be controlled by the method and apparatus of the invention include educational, as well as entertainment, devices.
It will be appreciated by those skilled in the art that, within the spirit of the present invention, means for detecting the subliminal modulation of the video program signal may be embodied in a hand manipulable probe, which probe itself may be the interactive device remotely controlled by the control data, thereby obviating the requirement of local communication of the reconstructed control data. It also will be appreciated f ~' o that, within the spirit of the invention, the communication of control data to an interactive device may be accomplished by other than IR means, e.g. an RF transmitter located adjacent the television may communicate the control data to an RF receiver within the interactive device, or an RF antenna- and receiver-equipped interactive device directly may detect the RF
emanations from the television, in accordance with the modification to the preferred embodiment that is proposed herein.
Accordingly, while a preferred method for practicing the invention, and a preferred embodiment of the apparatus of the invention and a proposed modification thereto have been described herein, it is appreclated that further modifications are possible that come within the scope of the invention.
Summ ~ e Invention Method and apparatus are described that permit the remote control of interactive devices proximate to a conventional television receiver by the broadcast of composite video information thereto. The method consists of producing a composite video siqnal containing program material and control data by subliminal luminance and/or chromlnance modulation;
broadcasting the signal to a television; receiving the signal by the television; detecting the modulatlon, at the ~elevision, to reproduce the control data; and locally transmitting the control data to enable entertainment, educatlonal or other deviceæ within range of the transmission to respond to the program material in a predetermined manner. The remote control apparatus includes means for generating a signal containing control data; means for generating a slgnal containing a video program; means for modulating the video program signal by the control data signal in timed relation thereto, thereby producing a control data-modulated video subcarrier detectable as modulation in at least one predefined viewing area of the television; means at the television for detecting such modulation in the viewing area to produce a control data sequence; and means for controlllng, in predetermined response to the control data sequence, the actions of at least one entertainment, educational or other device.
The data encoding method of the invention involves modulatlng a video slgnal at frequencies that are related to multipleæ and submultiples of the horizontal line rate, to produce a subtle video subcarrier. Although the modulatlon is within the viewing area of the television screen, it remains substantially invisible to the viewer because of lts relatively low lntensity, it~ timed relation to the horizontal llne rate and the inherent integratlon and resolution characteristics of the human eye. In order to ensure the integrity of the data communication, whlle limiting the cost to users of the decoding apparatus, the signal-to-noise ratio of the communication is increased, in the preferred embodlment of the lnventlon, by the data encoder's removal of subcarrier components interpretable as data when a binary 0 is to be encoded, and by the addition of a subcarrier when a binary 1 is to be encoded (or vice versa).
, ., Those skilled in the art will appreciate that one or more such subcarriers may be data modulated to convey information, in serial or parallel, in a variety of ways, including, but not limited to, pulse modulation (PM), phase modulation (PM), amplitude modulation (AM), frequency modulation (FM), time or pulse interval modulation (PIM), frequency shift keying (FSK), return-to-zero (RZ), non-return-to-zero (NRZ), or any other of a variety of spatio-temporal moduIation and coding techniques.
In its preferred embodiment, the interactive video apparatus takes the form of an optical transducer, or light sensitive diode, that may be 'aimed' at the television screen and that is connected via a twisted pair cable to a compact, battery-powered receiver/transmitter device located nearby.
Receiver electronics reconstruct the control data by detecting the video subcarrier in the modulated video image and producing a bit-serial signal representing the control data. Transmitter electronics amplitude modulate an infrared (IR) carrier by the reconstructed control data and drive an infrared light emitting diode (IRED) array. One or more interactive toys, which may be separately purchased, detect the carrier, decode the command field within the control data, and initiate one or more actions in response thereto.
In a proposed modification to the preferred emb,gdiment, an antenna capable of intercepting radio frequency (RF) electromagnetic radiation and coupling it to conventional receiver electronics replaces the optical transducer and twisted pair cable of the preferred embodiment. It has been found that an inaudible, but detectable, low RF artifact of the data modulated video subcarrier is produced by the raster scan electronics of a television which is displaying the composite video signal described herein. While being of somewhat more limited range, i.e. the antenna must be located within a few ~ 24047-516 feet of, and in front of, the television screen, due to the relatively low energy level of the RF emanations, this alternative embodiment also yields certain advantage~. the antenna may be located closer to the screen of the television, as it needs no field of view; and the antenna is less Yusceptible to interference from spurious, visible light sources, e.g. the hlgh frequency emanations of a fluorescent lamp.
Thus, the various objects of the invention are achieved.
~ublimlnal luminance ~odulation within a viewing area of the television enables data encoded therein to be detected, while the modulation remains invisible to a television viewer. The optical transducer, which may be 'aimed' unobtrusively at the television screen from a range of distances and through a range of angles, semirigidly extends from the receiver/transmitter device, which may be affixed discretely to the side of the television receiver, thereby obviating conventionally required interconnections. The detector, or decoder is simplified and the data communication rendered more reliable by the data encoder's removal, prior to broadcast, of video features that otherwise would be interpretable aæ data. Infrared transmission between the recelver/transmitter device and interactive devices located in the room is wireless and inaudible, and imposes no burden on users or non-users of the interactive video apparatus. The encoding of selective successive fields of the video image with a serial bit stream of binary data achieves a data rate adequate to permit real time control, within or outside the context of the video program material, of multiple interactive devices. Parity error detectlon logic wlthin the interactive devices controlled thereby ensures data integrity so that the interactive devices reliably respond ln a predefined manner. The electronics of the ~ 24047-516 apparatus use conventional logic circuitry and fabrication methods, including very large scale integration IVLSI), thereby further enhancing the reliability of the system and reducing its cost.
Different aspects of the invention are described and claimed hereinafter.
One of these aspects may be summarized as in conjunction with a method for producing a composite video signal containing video program material and control data, and displaying the signal on a television and decoding such control data for ancillary use, an improvement compriæing modulating at least one video field within the viewing area of a televislon in such manner that the modulation is substantially invisible to the television viewer, thereby producing a video subcarrier component of the signal, the component containing the data; and detecting the component to reproduce the data for the ancillary use.
Another of these aspects may be summarized as apparatus for the remote control of interactive devices by the broadcasi of composite video information to televisions, comprising5 means for generating a program signal containing a video program; means for generating a data signal containing control data; means for subliminally modulating the program signal by the data signal in timed relation thereto, thereby producing a control data-modulated video subcarrier detectable as digital modulation in at least one predefined viewing area of at least one television; mean~ adjacent at least one television for detecting the modulation in at least one viewing area to produce a control data sequence; and means for controlling, in predetermined response to the data sequence, the actions of at least one of the interactive devices.
Still another of these aspects may be summarized as B
~ 3~ 24047-516 apparatus for the remote control of at leact one interactlve device by the production of composite video information containing program material and control data, the video information having been produced by modulating selected viewing areas of the program material with the control data to produce a video subcarrler component, the component containing the data, for viewlng the program material on television screens, comprising, means adjacent at least one of the television ~creens for detecting the control data modulatlon-produced video subcarrier component to reproduce the data, and means for communicating such reproduced control data to at least one interactive device.
Yet another of the6e aspects may be summarized as for use ~ith the production of a composite video signal containing video program material for diæplay on a television, the -composite video signal further containing a video subcarrier component that contains control data for the remote control of interactive devices located proximate to the television and for use with apparatus capable of detecting such component and decoding and communicating such control data, an interactive device comprising~ a receiver capable of receiving the control data communicated by such apparatus, and a controller capable of initiating a predefined action in response to such received control data.
A further of these aspects may be summarized as apparatus for the control of at least one interactive device by the presentation of composite video information containing program material and control data to at least one television for viewing thereon the program material, the video information being produced by modulating the program material, within a viewing area of the television, with the control data to produce a video subcarrier capable of indicating the presence 7a r{ g . ~
,' i; "3 i) 2 4 0 4 7 - 5 1 6 and sense of the control data, comprising: means proximate to the television for detecting the subcarrier to reproduce the data, and means responsive to such reproduced data for controlling at least one interactive device.
The invention will now be described in greater detail with reference to the accompanying drawings.
Brief Descri~tion of the Drawinas Fig. 1 shows the use of an interactive toy system made in accordance with the preferred embodiment of the 10 invention.
- Fig. 2 schematically illustrates the novel luminance modulation method of the invention.
Fig. 3 schematlcally illustrates, in block diagram form, the vldeo receiver/IR transmltter electronics of the interactive apparatus.
Fig. 4 schematically illustrates, in block diagram form, the receiver electronics of an interactive toy.
Fig. 5 schematically illustrates, in block diagram form, the video encoding electronics of the invention.
Detailed DescriPtion of the Preferred Embodiment Fig. 1 is a pictorial representation of the use of the interactive video apparatus of the present invention. A
remote televlslon broadcast antenna 10 is shown broadcasting composite video information, or a composite video signal that contains video program material and control data, indicated by dash-dot-dot llne 12, to a televlslon 14. Antenna 14_ of television 14 picks up the remote broadcast and displays it on the screen, indicated generally at 14b. For the purposes of thls discussion, screen 14_ may be thought of as having a 30 program viewing area 14_, which generally is coextensive wi~h 7b .
~w ~ 24047-516 screen 14b, that includes representative area 14d, which will be used in reference to Fig. 2 schematically to illustrate the novel data encoding method of the invention. For illustration purposes only, and so that it will ~e appreciated how the interac~ive video apparatus may be used with entertainment devices, the video image of a car speeding past an intersection is shown as the prominent feature of the television program being displayed.
An optical transducer 16, having a light sensitive diode 18 on one end of a semirigid, twisted pair cable 18_, may be 'aimed' at viewing area 14_ from a distance, preferably greater than six inches, and at an angle, preferably greater than thirty degrees. In the preferred embodiment, cable 18a is rigidized by integrally molding cable 18_ with a stiff wire, using a suitable, elastomeric compound. Thus, once transducer 16 is positioned to point at viewing area 14c, its position is maintained thereafter until repositioned by the user. The other end of transducer 16 is connected to a translator, or receiver/transmitter device 20, which may be located adjacent television 14, e.g. atop or therebeside, and which may be affixed, for example, by the use of loop-and-pile textile (not shown). Transducer 16 coupled luminance modulation within its view to detecting means (not shown in Fig. 1, but shown in Fig.
3 and described in reference thereto) within receiver~transmitter device 20. Device 20 lncludes receiver/transmitter electronics mounted on a circuit board 22, and a front panel 24. IREDs 26, 28, 30 are mounted to printed circuit board 22, and extend to a position along front panel 24, enabling them to emit infrared energy generally in the direction shown by dash-dot lines 32a, 32b, 32c. It will be appreciated that any desirable number of IREDs may be used, depending upon the current capacity of the drive electronics ~ ~ h ~ 24047-516 and the desired transmission range.
An interactive device, such as car 34, within range of IREDs 26, 28, 30, contains light responæive means, or llyht sensitive diode 36 mounted on a printed circuit board 38 within car 34. In a manner that will be described below, blnary data may be encoded in viewing area 14c which data, although invisible to a viewer of the television, nevertheless is detectable by receiver/transmitter devlce 20 by the coupllnq of lumlnance modulation within viewing area 14c via transducer 16.
Receiver/transmitter electronics within device 20 reconstruct the control data from the luminance modulatlon, and transmit it to car 34. Car 34, responsive to a command embedded in the control data, initiates a predefined action. In the illustration, car 34 imitates the display activity, or mimics the action of the car in the television program by starting its motor and accelerating.
It will be appreciated that the interactive device may be any educational or entertainment device or the like capable of responding in a prescribed manner to control data that is transmitted as infrared energy within a proper frequency range. The potential uses for the interactive video apparatus described herein are virtually limitless. It also will be appreciated that the source of the composite video signal containing video program material and control data need not be remote broadcast antenna 10, as illustrated in Fig. 1, but rather may be a videocassette player conventionally connected to television 14 and either playing a pre-recorded videocassette tape or receivinq such a remote broadcast for local display on television 14 or other video monitor.
In a proposed modification to the preferred embodlment of the invention, transducer 16 takes the form of any of a variety of conventional RF antennas capable of .: 9 .
coupling low RF electromagnetic radiation emanating from television screen 14b to receiver/transmitter device 20. In the lnterest of 9a ~ '3~
illustrative brevity and clarity, Fig. 1 may be interpreted as showing this alternative embodiment, with the only difference being that light sensitive diode 18 and twisted pair cable 18a straightforwardly are replaced by a rigid conductor, similarly located and similarly oriented, which may be dimensioned and shaped, as is well-known, to provide adequate RF sensitivity.
Whereas light sensitive diode 18 of the preferred embodiment may be located a substantial distance from television screen 14b, but preferably greater than six inches therefrom, the effective range of the antenna of the proposed modification is both smaller and closer, i.e. the antenna preferably is located within a few feet of, but not in contact with, the television screen.
Turning next to Fig. 2, the novel method of encoding data within viewing area 14c of Fig. 1 schematically is illustrated. Detail A shows representative area 14_ in the absence of brightness modulation; detail B shows, in substantially exaggerated form, representative area 14_ in the presence of luminance modulation. For the sake of clarity and subject to graphic arts constraints, details A and B are shown with greatly exaggerated vertical spatial separation between horizontal scan lines, and with greatly exaggerated luminance modulation. Nevertheless, the illustrations are deemed instructive of the novel luminance modulation method proposed herein.
In detail A, relatively low luminance horizontal scan lines are represented by lines such as line 40. Relatively high luminance horizontal scan line segments are represented by relatively wider lines, such as line 42. In this way, high luminance features, such as those shown within area 14d of Fig. 1, contrast with the nominal luminance background areas of the moving picture frame captured illustratively in Figs. 1 and s~ ~
2. It will be appreciated that the line widths chosen for illustration purposes are representational only, and generally do not represent the actual scan line widths or spacings visible at this scale within viewing area 14c. It will be understood, in reference to Fig. 2, that the horizontal lines of details A
and B are non-interlaced, and represent the lines in a single field, rather than a line-interlaced frame. By modulating alternate lines within consecutive fields, data may be encoded for transfer at the television's field rate, e.g. 60 Hz in the case of National Television System Committee (NTSC) television broadcast.
Detail B illustrates the effect, within area 14d, of luminance modulating viewing area 14c, as depicted in detail A.
By alternately raising and lowering the luminance of adjacent horizontal scan lines within viewing area 14c, a video subcarrier is produced that is detectable by opto-electronic means, while the spatial relationship among picture elements within viewing area 14_, the luminance across viewing area 14c and the contrast between relatively high and relatively low luminance features within viewing area 14c are preserved. Thus, the background now contains alternately raised and lowered luminance horizontal scan lines 44 and 46, respectively. That is, raised luminance lines, represented by line 44, are at a luminance level slightly higher than that of line 40 of detail A, and, complementarily, alternate lines, represented by line 46, are at a somewhat lower luminance level compared to corresponding lines 40 of detail A. Corresponding to relatively high luminance feature lines 42 of detail A are rai~ed luminance lines, such as 48, and lowered luminance lines, such as 50.
As represented in Fig. 2, the luminance modulation, which enables the detector, to be described below, to detect and decode the binary data encoded by the preferred method of the ~ 0~7-516 invention, result~ in the alternate raising and lowering of the luminance levels of the horizontal line~ shown in detail A.
Although this modulation i5 exaggerated in detail ~ (and represented by line width, rather than line intensity, modulation), for illustrative purposes, it is apparent from details A and B that the overall average luminance of, and contrast between, the video features and the background within viewing area 14c are preserved.
Focuælng attention now on areas 52, 54 of Fig. 2, lt will be appreciated that, even in the presence of luminance modulation wherein a binary 0 or 1 may be coded, the spatial relationship among picture elements within an arbitrarily small region of viewing area 14c is preserved. For example, even if areas 52, 54 were reduced to embrace only two adjacent horizontal scan lines of viewing area 14c, the overall luminance within region 54 would be the same a~ that within correspondlng region 52. This is by virtue of the novel, alternate line, proportionate modulation scheme of the present invention, wherein the percentage by which one line's luminance is raised is equal to the percentage by which an adjacent line's luminance ls lowered. Those skilled in the art will understand that the same method may be applied to the chromlnance signal to produce a detectable, but subliminal, data modulated chrominance subcarrier.
Importantly, horizontal scan lines withln a field of the true video image, represented only schematlcally in Fig. 2, are closely spaced, so that any coarseness resulting from alternate line luminance modulation is substantially invisible to the viewer of television 14. In the practice of the preferred method of the invention, the peak-to-peak percentage modulation that, although virtually invisible to the viewer, nevertheless is detectable by opto-electronic means, is , ~ ,, .
v~ ~ o approximately 10 percent, or less than one half of the apparent modulation illustrated schematically herein.
It will be appreciated that the alternate line, proportionate modulation scheme described immediately above is only one of many subliminal, data encoding methods within the scope of the invention. Obviously, adjacent pairs, triplets, etc. of horizontal lines alternately may be proportionately luminance modulated, while still preserving the overall luminance of, and contrast between, the video features and the background within viewing area 14c. As will be described, in reference to Figs. 3 and 5, corresponding changes to the period and frequency of various filters and delay lines are all that would be required to accommodate ~uch a modification to the modulation scheme. It also will be appreciated that subliminal modulation within viewing area 14c of television 14 may be performed in such manner that multiple subcarriers simultaneously are present therein. In this way, more than one binary bit of data may be conveyed to, and detected by, transducer 16 within a single video field to achieve a data rate that is greater than the television's field rate. Higher data rates also may be achieved by the division of viewing area 14_ into multiple regions, each of which is subliminally modulated to encode one or more binary bits of data. Multiple transducers, such as transducer 16, may be 'aimed' within the separate regions and a decoder circuit, responsive to the transducers, may detect and decode the binary data presented in parallel to television 14.
Turning next to Fig. 3, a block diagram of the receiver/transmitter electronics capable of detecting, decoding, and transmitting binary coded data from television 14 to interactive toy 34 is described. Detecting means includes transducer 16 which is 'aimed' at screen 14_; light sensitive means, such as diode 18, which optically couples luminance within its view, via cable 18a, to a detector, or receiver electronics; and receiver electronics 56, which produce a control data sequence for the control of an interactive device.
Receiver electronics 56 analyze the electrical signal for energy within a range around 7.867 kHz, which is one half of the NTSC
nominal ~color) horizontal line frequency within a field, and is, therefore, the frequency at which luminance is modulated in viewing area 14_ of the television screen. In the presence of luminance modulation within this range of frequencies, the output of receiver electronics 56 represents a binary 1 or 0, indicating the presence and sense of control data intended for ancillary use by, e.g. an interactive device.
Receiver electronics 56 include amplifier 58, the gain of which is determined by feedback resister Rf, the value of which may be determined by well-known methods dual, series band-pass filter/amplifiers 60, 62, both tuned to pass, and somewhat amplify, energy in a range about 7.867 kHz and each having a selectivity, or Q, of approximately 10; full-wave rectifier 64, the output of which is smoothed by capacitor C;
and level comparator 66, which compares the smoothed output of rectifier 64 with a predefined reference voltage to determine whether the 7.867 kHz energy is, in fact, encoded data, rather than,incidental, video noise. It will be appreciated that filter/amplifiers 60, 62 may be combined into a single stage amplifier yielding similar gain and selectivity.
Level comparator 66, which may be thought of as being of high gain, but limited dynamic range, compares the smoothed output of rectifier 64 preferably for a period of time greater than the period of several horizontal lines, thereby ensuring against a false indication of the presence of encoded data within a field that happens to have adjacent horizontal lines of ~ h ~ 24047-516 different luminance, e.g. a horizontal boundary between high and low luminance features of a video image. In the preferred embodiment, the time period over which comparator 66 is active is approximately equal to the time it takes the raster scan electronlcs of television 14 to traverse fifteen horizontal lines. The output of comparator 66 is bistable, having a first, active state during an interval of time, preferably greater than one millisecond (corresponding to the presence of luminance modulation), and having a second, inactive, statè at all other times. Thus, detecting means produces a control data saquence by the continuous monitoring of lumlnance modulation within viewing area 14c of television 14.
It will be appreciated that band-pass filter/-amplifiers 60, 62 may be centered on frequencies other than 7.867 kHz, to correspond with the luminance modulatlon frequency at which data i5 encoded. It also will be appreclated that multiple detecting means may be provided, within the spirit of the invention, wherein each is capable of detecting luminance modulation within distinct frequency ranges representlng multiple, binary data bits.
Referrlng still to Fig. 3, it is seen that means for wirelessly communicating the control data to an interactive device includes an IR modulator 68, which modulates a 32 kHz carrier by the bistable output of comparator 66, and drives an IRED array consisting, in the preferred embodiment, of three IREDs 26, 28, 30. IREDs 26, 28, 30 are mounted to printed clrcult board 22 and supported by front panel 24 (refer to Fig.
1), and emit IR energy generally in the direction shown by dash-dot lines 32a, 32b, 32c, thereby pro~ecting, into a projection field, encoded light-borne information derived from such control data. It will be appreciated that the carrier may be of any frequency, but is preferably of a frequency above the audible range to avoid undesirable acoustic coupllng, and i preferably distinct from the carrier frequencies of other devices, e.g. the remote control device that wirelessly operates the television.
It will be appreclated that the receiver/transmitter electronics shown in Fig. 3 require no synchronization with the raster scan tlming of television 14. They require no electrical connection whatsoever to television i4 or antenna 14a. It will be appreciated further that the receiver/-transmitter electronics of device 20 are, in the preferredembodiment, battery-powered, thereby eliminating the necessity of supplying AC power thereto. The mere presence of subliminal luminance modulation of the proper frequency anywhere within viewing area 14c, coupled by transducer 16 to receiver ~ . .
electronics 56, enables the electronics within device 20 to discriminate control data from random video patterns. Thus, the invention enables subllminal, in-band data communication at a data rate greater than, egual to or less than the field rate of a conventional televi~ion, without the necessity of internal or external hookups.
It will be understood by those skilled in the ar~
that when an antenna, rather than a light sensitive diode, is used to couple the data-modulated video ~ubcarrier to receiver/transmitter 20, in accordance with a proposed modification to the preferred embodiment of the invention, receiver electronics 56 need be changed only to the extent that the input to buffer amplifier 58 will be the signal received by the antenna, rather than that produced by light sensitive diode 18, and minor adjustments desirably may be made, as is well-known, to the gain and selectivity of filter/amplifiers 60, 62and/or the reference voltage of level comparator 66.
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Turning now to Fig. 4, receiver electronics within an interactive toy, such as car 34, are illustrated. Projected information in the form of IR energy, such as that shown by dash-dot line 32a, i5 æhown incident upon a receiver adapted to receive such projected information when within such field. In the receiver, whlch include~ llght responsive means and carrler detecting means, selectively IR light responslve means includlng light sensltlve 16a L ~
diode 36 produces a signal that is routed to carrier detecting means, or a conventional IR preamplifier circuit of the type commonly found in wireless, remotely controllable televisions.
Generally, IR preamplifier 70 includes a buffer amplifier 72, an amplifier 74 tuned to the carrier frequency of IR modulator 68, a full-wave rectifier 76 and a level comparator 78.
Preamplifier 70 transforms amplitude modulated, 32 kHz IR energy 32a that is incident upon light sensitive diode 36 into a demodulated, digital signal. This digital signal represents the bit-serial data that was detected as luminance modulation at television 14, in what will be understood to be an RZ, binary-coded format. In other words, the binary ls and Os representing the data are separated in time by null, or inactive periods, during which the level of the digital output of comparator 78 would be, by high-true convention, a logic 0.
In the preferred embodiment, control data that are encoded by luminance modulation for broadcast to television 14 are formatted in an asynchronous, or start/stop, protocol. In this well-known format, which is compatible with conventional universal asynchronous receiver/transmitter (UART) chips and communications line monitoring and data logging equipment, data may be represented by a five- to eight- bit code preceded by a start bit, optionally succeeded by a parity bit and succeeded by a stop bit. Although in the preferred embodiment of the invention the data field is five bits long and a parity bit is used to ensure data integrity, it will be appreciated that any predetermined number and arrangement of bits within the control data may be used.
It also will be appreciated that, within the data field representing command/address information intended to activate an interactive device, the command/address information may be encoded in a variety of ways. In the preferred embodiment, the first three of the five data bits are alway~ a binary 1, and the remaining two bits are reserved to convey predefined command information to an interactive device in a manner that will be described.
The digital output of comparator 78, which represents an RZ, binary-coded, control data se~uence, is latched, validated and decoded by latch/decode logic 80, which is clocked at the data rate, e.g. 60 Hz. As consecutive bits, includlng a start bit, a parity bit and a stop bit of predefined logic levels, are clocked into a controller, or latch/decode logic 80, the control data field is validated as containing command/address information. When they have been validated as being properly framed by a start and stop bit and as being of correct parity, the five bits of command/address information, or information-related control signals are enabled onto bus 82, which is routed to various activity-producing means (not shown) e.g. a motor within an interactive devtce, such as car 34.
It will be understood that latch/decode logic 80 may be implemented in any of a number of well-known digital logic circuits. For example, a shift regiæter may be used to accumulate successive control data bits, and any of various clock recovery schemes may be used to deflne a signal the edge of which clocks successive bits of control data into the shift register. Or, for example, by inverting and stretching the output of comparator 78 to a duration of greater than one half of a bit time, e.g. by the use of a monostable multivibrator, a UART may be used to implement the latch/decode logic, by supplying a clock at a ra~e equal to 16 times the data rate.
It will be appreciated that, by the use of a UART, binary data are automatically validated (as against parity and framing errors) and are latched for their parallel presentation onto l u ~
data bus 82. In the preferred embodiment of the invention, latch/decode logic 80, as well as IR preamplifier 70 circuitry, is implemented in a custom VLSI chlp, thereby substantially reducing the cost and increasing the reliabillty of car 34.
It wlll be appreciated that the addreæs/command fleld of the control data may be of any length, and may be encoded in a number of ways, depending upon system requirements, e.g. how many interactive devices need be addressed and how many commands each need comprehend. Further, it will be appreciated that, by comparing the address field to one or more predefined values, particular interactive devices, within the user's home, having address responsive means selectively may initiate the action indicated by the command field when the address field and one or more such values are equal. For example, the address/command field may be assigned a mode control bit that determines how the remaining bits will be interpreted by an interactive device. In the case of a large number of relatively limited capacity interactive devices, most of the remaining bits may be reserved to address, and a relative few to command. In the case of fewer, more capable interactlve devices, most of the remaining bits may be reserved to command, and a relative few to address. In this way, a flexible system may be designed in which interactive devices of varying number and capability are accommodated within an address/command field of any desirable length and respond only to preassigned, device-specific addresses.
A particular interactive device ie, in the preferred embodiment, hard-wired to respond in a predetermined way to control data received thereby to generate data-related device activity, thus to coordinate device activity with display actlvlty. It will be appreciated that it instead may be programmed, or read-only memory-(ROM-)controlled, so that the response~ more readily may ~e changed. The actions initiated by one or more interactive devices might include motor;
: steering; headlight; siren; ~peech synthesis; or numerous others. In the case of an interactive device that is not an 19a o action toy, successive command fields may represent, for example, American Standard Code for Information Interchange (ASCII) text that may be displayed on a lap-top display device, or Musical Instrument Digital Interface (MIDI) data that may be used to control a musical instrument. Thus, the particular application illustrated in Fig. 1, wherein the interactive device is toy car 34, is merely one of numerous uses of the novel interactive video apparatus of the present invention.
Turning finally to Fig. 5, the preferred embodiment of the encoding electronics used to produce a data-encoded, composite video signal for remote broadcast, illustrated in block diagram form, is indicated generally at 84. Encoding electronics 84 best will be understood as a modification to what is known as a video processing amplifier, commonly used in the context of video broadcasting to ensure that videotapes conform to broadcast quality, format and other regulatory requirements.
First, those portions of the diagram which relate to the production of a composite video signal containing video program material and control data will be described. Second, a video preview circuit will be described that enables a videotape to be viewed, prior to data encoding, to determine the suitability of the program material for luminance modulation. Finally, a data remove circuit, which permits a previously data-encoded videotape to be restored to its pre-encoded condition, will be described.
Indicated at 86 are the functional blocks that, in the preferred embodiment of the invention, implement the luminance modulation, data encoding scheme. Data encoder 86 includes an input buffer 88 into which means (not shown) for generating a program signal feed video program material. A
chroma separator 90 extracts the chrominance component of the conventional color-composite signal, while sync separator 92 r - ~
extracts the synchronization component therefrom, allowing only the luminescence component to reach video/data mixer 94. The only other input to mixer 94 (with the REMOVE DATA switch open) is the control data to be mixed with the video program material.
Means for generating a data signal, e.g. computer means (not shown), present control data bit-serially to the D
input of a flip-flop 96, where the logic level, representing a 1 or a 0 to be encoded for broadcasting, is synchronized with the VERTICAL SYNC signal having a frequency equal to the field rate.
The synchronized output of flip flop 96 is ANDed at 98 with the 50~ duty cycle output of a flip-flop 100 the toggle input of which is the HORIZONTAL SYNC signal. A blanking protection, or blank protect circuit 102 level clamps the output of AND gate 98 to ensure that the normal video synchronizing signals, HORIZONTAL SYNC, VERTICAL SYNC and chroma reference, which are transmitted during the blanking intervals, are not disturbed by data modulation. Circuit 102 also biases the output of AND gate 98 to have approximately equal positive and negative excursions, in order to provide proportionately raised and lowered luminance when the control datum is a binary 1, and to make no contribution to the luminance output of mixer 94 when the control datum is a binary 0.
A 'white' and 'black' clipper circuit 104 ensures that, after the mixing of program material and control data in mixer 94, maximum 'white' and minimum 'black' levels are not exceeded. A second mixer 106 recombines the chrominance and luminescence signals, producing a signal that is blanked, during horizontal retrace, in blank adder 108.
Referring still to data encoder 86, circuitry is illustrated the operation of which is well-understood by those skilled in the art including: burst amplifier 110; burst phase adjust 112; chroma processor 114; clamp 116; sync processor 118;
~: ~3 i~0 clamp and blank generator 120 final stage amplifier and mixer 122; sync amplifier and driver 124, which produces a signal called SYNC OUT; and output driver 126, which provides the VI~EO
OUT signal. Thus, data encoder 86 provides means for modulating the program signal by the data signal in timed relation thereto, thereby producing a control data subcarrier.
Referring still to Fig. 5, a video previewer, indicated at 128, is described in detail. The purpose of previewer 128 is to provide a method of previewing video program material, field by field, for its suitability in the luminance modulation, data encoding scheme of the preferred method.
Previewer 128 permits the identification of a sequence of consecutive video fields each of which contains, in the window circumscribing the viewing area to be encoded, high and low luminance respectively below and above a corresponding threshold level. Similarly, previewer 128 permits a videotape containing the 7.867 kHz video subcarrier to be identified as either already having been data-encoded or as containing video features which would be detected as encoded data when, in fact, they are not. By well-known field tagging techniques, fields that are either too 'white' or too 'black' effectively to be luminance modulated, or fields containing video features that would appear to be data, may be identified by their time code sequence numbers and may be excluded as candidates for data encoding.
Those skilled in the art will appreciate that the addition of an appropriate video delay between previewer 128 and encoder a6 i.e. a delay longer than the predefined control data word length, would permit videotapes to be previewed, tagged and data encoded in a single pass or playback period.
By reference to video previewer 128, it first will be seen that video program material is delayed, in the preferred embodiment, by one horizontal line through an ultrasonic delay '.i J~
line 130. The resulting signal is then inverted through analog inverter 132 ~assuming that the TEST 2 switch is closed), and mixed with an undelayed version of the same program material signal in adjustable phase mixer 134, in what may be thought of as a double-line correlator. A 250 kHz, low-pass filter 136 removes undesirable, high-frequency artifacts of horizontal delay line 130. The output of filter 136 is clamped at 138 (while VERTICAL SYNC iS active) and sampled, during the traversal of the windowed portion of the field being analyzed, as this is the only time of particular interest. A 7.867 kHz band-pass filter 142, a full-wave rectifier 144, an integrator 146 and a reference voltage comparator 148 produce a binary signal, DATA PRESENT, when the windowed field being analyzed contains what appears to be encoded data.
It will be understood that WINDOW, which defines the perimeter of an included subfield of the viewing area in which video program material and control data will be mixed, is used to switch gate 140 and, via clamp 150, to define the period over which the subcarrier is integrated. It will be understood that 20 WINDOW may be produced by a combination of horizontal sync, vertical sync and a pattern generator (not shown), which may be defined by a programmable read-only memory (PROM) or other microcontrol device (not shown). Notwithstanding the fact that, in the preferred embodiment, the subfield circumscribed by ~.;, WINDOW is the entire viewing area 14c of television 14, it will be appreciated that a proper subfield -- of lesser area than viewing area 14c -- may be defined, within the spirit of the invention, and its boundaries blended, by use of a ramp generator, to avoid a perceptible difference between the unmodulated and modulated regions of viewing area 14_ at the interface therebetween. It will be appreciated that the luminance modulated subfield need not be rectangular, or of any I.~h~
fixed shape, but rather may be amorphously defined under the pseudorandom control of a pattern generator. Importantly, the preferred method and embodiment of the invention avoid the boundary problem by luminance modulating the entire viewing area 14_ of television 14.
The video program material signal is clamped at 152 and, via gates 154, 156, is sampled for the duration of the WINDOW signal. The output of gate 154 is peak detected at 158, clamped at 160 (while VERTICAL SYNC is active) and compared at 162 to a predetermined 'white' luminance maximum, thereby producing a signal, TOO WHITE, that indicates whether the luminance within the subfield is too high detectably to be luminance modulated with data. Complementarily, the output of gate 156 is peak detected at 164, clamped at 166 (while VERTICAL
SYNC is active) and compared at 168 to a predetermined 'black' luminance minimum to produce a signal, TOO BLACK, that indicates whether the luminance within the subfield is too low detectably to be luminance modulated. It will be understood that TOO
WHIT~, TOO BLACK may be monitored by computer means (not shown) to tag the corresponding subfield as being either of too high or too low a luminance. During the data encoding process, such fields may be avoided, and a more suitable, but equally timely, sequence of fields may be encoded with control data. In an alternative embodiment, such fields might be rendered suitable, rather than avoided, by computer means, e.g. by modifying video levels such as gain and pedestal.
Delay line 130, which in the preferred embodiment imposes approximately a 63.556 ~s delay, which is the NTSC
nominal horizontal line period, permits the inverse of the instantaneous luminance of the previous horizontal line to be added to the instantaneous luminance of the present line, in mixer 134, producing thereby an instantaneous luminance ~ 3~
difference between the two adjacent lines. In the presence of luminance modulation at or about the 7.867 kHz frequency, the signal representing this difference will contain a substantial subcarrier component that may be detected at the output of comparator 148. It will be appreciated that the data present circuit of video previewer 128 is similar in many respects to receiver electronics 56, illustrated in Fig. 3, in that it seeks to detect a threshold video energy level at one half of the NTSC
horizontal line frequency. It also will be appreciated that video delay line 130 may be implemented in alternative devices, e.g. charge-coupled device (CCD) shift registers.
Referring still to Fig. 5, it is noted that a data remover is indicated at 170. Generally, data remover 170 may be thought of as a triple-line correlator. In the presence of the 7.867 kHz video subcarrier as among three, adjacent, horizontal scan lines, data remover 170 produces an inverted subcarrier of equal amplitude, used in mixer 94 ~when the REMOVE DATA switch is closed) to cancel the detected subcarrier. As shown in Fig.
5, when data remover 170 is used, video program material is preprocessed thereby before being inputted to data encoder 86 and video previewer 128, thereby enhancing the suitability of fields for modulation while substantially invisibly impacting the program material itself.
.,~ VIDEO IN is routed to a test mixer 172 the other input of which normally makes no contribution (with the TEST 1 switch open). Mixer 172 provides a video signal that is delayed by one horizontal line through a 63.556 ~s delay line 174, further delayed, for reasons that will become apparent, by a compensatory delay circuit 176 and then inputted to buffer 88 of data encoder 86 and to delay line 130 of previewer 128. The output of mixer 172 is inverted by analog inverter 178, whose current output is limited by resistor Rl before it is inputted 1 ~ rJ ~
to mixer 180. This first input to mixer 180 may be thought of as contributing minus one fourth of the present horizontal line's instantaneous luminance. The current output of delay line 174 is limited by resistor R2, and becomes a second input to mixer 180. This second input to mixer 180 may be thought of as contributing plus one half of the instantaneous luminance of the previous horizontal line. The output of delay line 174 also is inputted to a delay line 182, the current output of which is inverted at 184 and limited by resistor R3, thereby forming the third input to mixer 180. This final input to mixer 180 may be thought of as contributing minus one fourth of the instantaneous luminance of the horizontal line 1mmediately preceding the previous horizontal line.
It will be seen that the output of mixer 180 represents a weighted sum of the instantaneous luminance of three adjacent horizontal lines of VIDEO IN. In the presence of a video subcarrier at or about the 7.867 kHz frequency, the output of mixer 180 represents the inverse of the present horizontal line's luminance modulation component. This is because, as among any three adjacent horizontal lines within a data-encoded subfield, 1) one will be raised and two will be lowered in luminance, or 2) two will be raised and one will be lowered in luminance. Three adjacent horizontal lines, therefore, definitively enable the detection of a subcarrier at VIDEO IN. It will be appreciated that the weighted sum of the three inputs to mixer 180 is equal to the average amplitude of the luminance modulation between any two adjacent lines, which in the absence of luminance modulation is zero.
Those skilled in the art will appreciate that, whereas it has been found that the double-line correlator of video previewer 128, and the triple-line correlator of data remover 170, respectively enable the detection, and the removal, of encoded data or spurious data components of VIDEO IN,alternative embodiments are within the spirit of the invention.
For example, an n-line correlator may be used to increase the sensitivity of the circuits to the presence of a subcarrier component, thereby to enhance the ability of video previewer 128 to detect, or of data remover 170 to suppress, encoded or spurious data. Straightforwardly, an n-input mixer may produce a weighted sum of incrementally delayed video inputs so that, in effect, previewer 128 or remover 170 takes a wider, n-line 'view' of VIDEO IN. Thus, the 36 db rejection ratio of the triple-line correlator, for example, may be increased by cascading n delay lines and defining their relative plus or minus contributions to the weighted sum in such manner that the sum is zero when no subcarrier of a particular freguency is present.
It also will be appreciated by those skilled in the art that delay lines, such as delay line 174, may, within the spirit of the invention, assume values other that 63.556 ~s.
Generally, delay lines are specified to impose a delay nominally equal to one half of the inverse of the subcarrier modulation frequency, as is the case in the preferred embodiment described herein. Due to the general applicability of the subliminal modulation method of the invention, of which the alternate, proportionate raising and lowering of the luminance of adjacent horizontal lines is merely one example, the subcarrier frequency may be higher or lower than 7.867 kHz, and the delay lines may impose a respectively lower or higher video delay.
Referring still to Fig. 5, it will be seen that the output of mixer 180 is filtered at 186, to eliminate undesirable, high-frequency components, including the NTSC
chrominance subcarrier component nominally at 3.579 MHz, and is inverted at 188 for presentation, via REMOVE DATA switch 190, to 1P~ J jJ~
video mixer 94. It will be understood that, due to the inherentpropagation delay of the output of mixer 180 through filter 186, a compensating delay of the output of delay line 174 must be imposed, in order to ensure the synchronized arrival of inputs to video/data mixer 94. If VIDEO IN contains video features that, to the detector, would appear as luminance modulation, i.e. if VIDEO IN contains spurious data or if VIDEO IN in fact contains encoded data, then the modulation component of the present horizontal line effectively will be purged, or cancelled, by adding in mixer 94 a signal of equal amplitude to, but of opposite sign from, the modulation component. Thus, the video output of output driver 126, by the operation of data remover 170, contains video program material only, rather than the combination of video program material and a luminance modulated subcarrier or video features detectable as spurious data.
When it is desired to remove data from a previously data-encoded videotape, as determined, for example, by previewing the videotape and monitoring DATA PRESENT, the user need only close REMOVE DATA switch 190, process the encoded videotape through encoding circuit 84 and record VIDEO OUT on a blank videotape. In this novel way, the data encoding process enabled by the apparatus of the present invention may be reversed to restore videotapes so processed to their prior, unencoded condition. By the inclusion in encoding circuit 84 of video previewer 128, data encodsr 86 and data remover 170, videotape masters may be previewed and data encoded or restored, based upon the DATA PRESENT tagging of subfields therein. It will be appreciated that data encoder 86 and data remover 170 alternatively may be used simultaneously 1) to remove unwanted video features that are detectable as spurious data or an 5 ~
unwanted modulated subcarrier, and 2~ to add the desired modulated subcarrier.
It is possible to test video previewer 128 and data remover 170 by injecting a 7.867 kHz signal into the second input of mixer 172 via TEST 1 switch 192. It will be appreciated that if a 7.867 kHz subcarrier is injected at mixer 172, then DATA PRESENT will indicate the presence of this pseudo-data subcarrier. Similarly, it will be appreciated that if a 7.867 kHz subcarrier is injected at mixer 172, and if REMOVE
DATA switch 190 is closed, then although DATA PRESENT will be active, nevertheless VIDEO OUT will contain no subcarrier component, due to the difference producing effect of data remover 170 and the cancelling effect of mixer 94. It will be understood that, were TEST 2 switch 194 open, video previewer 128 still would indicate the presence of data but, because it would depend upon simple line detection (as do receiver electronics 56) rather than dual-line correlation, previewer 128 would exhibit a lower signal-to-noise ratio. Finally, TEST 3 switch 196 permits the loop back testing of video previewer 128 and data remover 170, by presenting video program material to delay line 130 (when switch 196 is in its OFF position), or by presenting VIDEO OUT to delay line 130 (when switch 196 is in its ON position).
The preferred method of the present invention now may be understood, in light of the apparatus described herein. By luminance modulating alternate horizontal scan lines of successive video subfields within the viewing area of a television in a manner that the modulation is substantially invisible to the television viewer, a composite video signal containing video program material and control data may be produced, e.g. by the use of encoding circuit 84. By detecting the video subcarrier component, as, for example, by detecting ~ ;S~v~ 3means including transducer 16 and detector 56, the encoded data may be reproduced, at or near the television but asynchronously relative to the raster scan timing thereof, for ancillary use, e.g. to control an interactive device.
The composite video signal containing the video program material and the control data may be produced by identifying, as by tagging and logging, a sequence of consecutive fields that are suitable for data encoding, e.g. by the use of video previewer 128. Optionally, e.g. by the use of data remover 170, fields containing encoded or spurious data may be purged of the video subcarrier, thereby rendering them suitable for data encoding, e.g. by the use of data encoder 86.
The formatting of a binary data sequence, e.g. by the uqe of computer means that has access to the DATA PRESENT, TOO WHITE
and TOO BLACK signals, permits the control data sequence to be fitted within the identified field sequence. After generating synchronization signals defining a window that circumscribes an included video subfield, program material and control data may be mixed, within the window and in response to the signals, by luminance modulating the program material with the control data.
It will be appreciated that, while analog means of previewing, encoding and restoring videotapes are described herein, nevertheless the use of digital means, e.g. by the manipulation of gray scale-coded pixels within a frame buffer, is within the spirit of the invention.
Broadcasting the composite video signal produced by the steps described immediately above enables one or more televisions to receive the signal, enables detecting means proximate thereto to reproduce the data, and enables an IR
modulator and IR~D array locally to transmit the data, causing interactive devices to respond to the data-encoded program material. In the preferred method of the invention, the detecting is performed by locally optically coupling themodulation, e.g. via transducer 16, to receiver electronics, wherein the program material is discriminated from the control data. By amplitude modulating an IR carrier with the control data, the latter inaudibly and wirelessly may be communicated to interactive devices within range of the transmission.
The advantages offered by the invention should be apparent to those skilled in the art. The method and apparatus disclosed herein enable subliminal, in-band, data communication over conventional television broadcast channels, for ancillary use at a site local to the home television viewer. Detection apparatus, including an optical transducer which unobtrusively monitors any desired region within a program viewing area of the television screen, enables receiver/transmitter electronics to discriminate control data from random video noise, and locally to transmit the control data to one or more interactive devices within its IR transmis~ion range. Such interactive devices flexibly may be programmed to initiate predefined actions in response to the television program's story line. The apparatus requires no electrical connections to the television receiver or antenna, and wirelessly, remotely controls interactive devices within a television viewer' 5 home. Interactive devices that remotely may be controlled by the method and apparatus of the invention include educational, as well as entertainment, devices.
It will be appreciated by those skilled in the art that, within the spirit of the present invention, means for detecting the subliminal modulation of the video program signal may be embodied in a hand manipulable probe, which probe itself may be the interactive device remotely controlled by the control data, thereby obviating the requirement of local communication of the reconstructed control data. It also will be appreciated f ~' o that, within the spirit of the invention, the communication of control data to an interactive device may be accomplished by other than IR means, e.g. an RF transmitter located adjacent the television may communicate the control data to an RF receiver within the interactive device, or an RF antenna- and receiver-equipped interactive device directly may detect the RF
emanations from the television, in accordance with the modification to the preferred embodiment that is proposed herein.
Accordingly, while a preferred method for practicing the invention, and a preferred embodiment of the apparatus of the invention and a proposed modification thereto have been described herein, it is appreclated that further modifications are possible that come within the scope of the invention.
Claims (49)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In conjunction with a method for producing a composite video signal containing video program material and control data, and displaying the signal on a television and decoding such control data for ancillary use, an improvement comprising modulating at least one video field within the viewing area of a television in such manner that the modulation is substantially invisible to the television viewer, thereby producing a video subcarrier component of the signal, the component containing the data; and detecting the component to reproduce the data for the ancillary use.
2. The improvement of claim 1, wherein the detecting is performed by locally optically coupling the modulation to receiver electronics having means for discriminating the program material from the control data.
3. The improvement of claim 1, wherein the detecting is performed asynchronously relative to the raster scan timing of the television.
4. The improvement of claim 1, wherein the modulating is of alternate horizontal scan lines within each field.
5. The improvement of claim 1, which further comprises previewing the video program material, prior to the modulating, to select at least one field suitable for data encoding, wherein the modulating is performed selectively on such a selected field.
6. The improvement of claim 4, which further comprises processing the video program material, prior to the modulating, to enhance the suitability of at least one field for modulating, the processing being performed in such manner that the enhancement is substantially invisible to the television viewer.
7. The improvement of claim 6, wherein said processing includes purging at least one field of video features which otherwise would be detectable as such video subcarrier component.
8. A method for producing a composite video signal containing pre-recorded video program material and control data for the display of the signal by a television for viewing thereon the program material and for the detection of the control data by external equipment for ancillary use, comprising identifying at least one sequence of consecutive fields of the program material wherein each field contains at least one included video subfield that is capable of being subliminally and detectably modulated with at least one bit of binary data; formatting at least one binary data sequence containing the control data in such manner that the data sequence can be fitted within the field sequence; generating synchronization signals defining a window that circumscribes the video subfields; and mixing the program material and the data within the field sequence, and within the window in response to the signals, by modulating the material by the data in such manner that the modulating is substantially invisible to a viewer of the television and is detectable for the ancillary use.
9. The method of claim 8, wherein the mixing is performed by luminance modulating the material by the data in such manner that the overall luminance level within the window is preserved.
10. The method of claim 8, wherein the mixing is performed by chrominance modulating the material by the data in such manner that the overall chrominance level within the window is preserved.
11. The method of claims 8, 9 or 10, wherein the mixing is performed by modulating the material by the data in such manner that the spatial relationship among picture elements within the window is preserved.
12. The method of claim 8, wherein the mixing is performed by luminance modulating alternate horizontal scan lines within the window whereby, as between any two adjacent scan lines, the luminance level of a first is raised by a predetermined percentage and the luminance level of a second is lowered by substantially the same percentage, the modulation being detectable as an indication of the presence and sense of the control data.
13. The method of claim 8, wherein the mixing is performed by chrominance modulating alternate horizontal scan lines within the window whereby, as between any two adjacent scan lines, the chrominance level of a first is raised by a predetermined percentage and the chrominance level of a second is lowered by substantially the same percentage, the modulation being detectable as an indication of the presence and sense of the control data.
14. A method for remotely controlling interactive devices by broadcasting composite video information to a television, comprising: producing a composite video signal containing program material and control data by modulating selected viewing areas of the program material with the control data, thereby creating a video subcarrier component of the signal, the component containing the data; broadcasting the signal to at least one television; receiving the signal at at least one television; detecting, adjacent at least one television, the component to reproduce the data; and transmitting the data to enable interactive devices within range of the transmission to act, responsive to the program material, in a predetermined manner.
15. The method of claim 14, wherein the producing is performed in such manner that the modulation is substantially invisible to a television viewer.
16. The method of claim 15, wherein the producing is performed by luminance modulating selected viewing areas of the program material with the control data.
17. The method of claim 15, wherein the producing is performed by chrominance modulating selected viewing areas of the program material with the control data.
18. The method of claim 14, wherein the detecting is performed by locally optically coupling the modulation to receiver electronics having means for discriminating the program material from the control data.
19. The method of claim 18, wherein the transmitting is performed wirelessly.
20. The method of claim 19, wherein the transmitting is performed optically.
21. The method of claim 20, wherein the transmitting is performed by data modulating an infrared carrier.
22. Apparatus for the remote control of interactive devices by the broadcast of composite video information to televisions, comprisings means for generating a program signal containing a video program; means for generating a data signal containing control data; means for subliminally modulating the program signal by the data signal in timed relation thereto, thereby producing a control data-modulated video subcarrier detectable as digital modulation in at least one predefined viewing area of at least one television; means adjacent at least one television for detecting the modulation in at least one viewing area to produce a control data sequence; and means for controlling, in predetermined response to the data sequence, the actions of at least one of the interactive devices.
23. The apparatus of claim 22, wherein the modulating means produces a video subcarrier that is substantially invisible to a television viewer.
24. The apparatus of claim 23, wherein the detecting means includes means for optically coupling the modulation to receiver electronics having means for discriminating the program signal from the data signal.
25. The apparatus of claim 24, wherein the coupling means includes a light sensitive device.
26. The apparatus of claim 23, wherein the controlling means includes means for wirelessly transmitting the data sequence to at least one of the interactive devices.
27. The apparatus of claim 26, wherein the wireless transmitting means produces a data-modulated infrared carrier.
28. Apparatus for the remote control of at least one interactive device by the production of composite video information containing program material and control data, the video information having been produced by modulating selected viewing areas of the program material with the control data to produce a video subcarrier component, the component containing the data, for viewing the program material on television screens, comprising means adjacent at least one of the television screens for detecting the control data modulation-produced video subcarrier component to reproduce the data, and means for communicating such reproduced control data to at least one interactive device.
29. The apparatus of claim 28, further comprising means for producing the composite video information in such manner that the control data are substantially invisible to a television viewer.
30. The apparatus of claim 29, wherein the communication means is wireless and includes an infrared transmitter.
31. The apparatus of claim 30, further including means for modulating a carrier to represent the control data, the carrier being of a frequency above the audible range.
32. The apparatus of claim 29, wherein the data are binary, and are communicated bit-serially.
33. The apparatus of claim 32, wherein the data are transmitted in accordance with an asynchronous protocol.
34. The apparatus of claim 33, further comprising at least one interactive device, each including an infrared receiver capable of receiving the control data, and a controller capable of initiating a predefined action in response thereto.
35. The apparatus of claim 34, wherein the data include a command field and an address field, and wherein each of the controllers responds to the control data by comparing the address field to at least one predefined value, and selectively initiating the action defined by the command field when the address field is equal to at least one such predefined value.
36. For use with the production of a composite video signal containing video program material for display on a television, the composite video signal further containing a video subcarrier component that contains control data for the remote control of interactive devices located proximate to the television and for use with apparatus capable of detecting such component and decoding and communicating such control data, an interactive device comprising: a receiver capable of receiving the control data communicated by such apparatus, and a controller capable of initiating a predefined action in response to such received control data.
37. The device of claim 36, wherein the control data includes a command field and an address field, the device further comprising address responsive means for selectively initiating a predefined action only when the address field corresponds to at least one preassigned device-specific address.
38. The device of claim 36, wherein the communication of control data is performed by wireless optical transmission, and wherein the receiver includes light responsive means for detecting and validating the control data.
39. The device of claim 38, wherein the transmission is within the infrared spectrum and the light responsive means is selectively responsive to energy within the infrared spectrum.
40. The device of claim 39, wherein an infrared carrier at a frequency above the audible range is modulated by the control data, and wherein the light responsive means includes carrier detecting means for selectively responding to infrared energy generally at the frequency of the carrier.
41. The device of claim 40, wherein the communication of the control data is performed in accordance with an asynchronous protocol.
42. Apparatus for the control of at least one interactive device by the presentation of composite video information containing program material and control data to at least one television for viewing thereon the program material, the video information being produced by modulating the program material, within a viewing area of the television, with the control data to produce a video subcarrier capable of indicating the presence and sense of the control data, comprising: means proximate to the television for detecting the subcarrier to reproduce the data, and means responsive to such reproduced data for controlling at least one interactive device.
43. Apparatus for the remote control of at least one interactive device by the broadcast of composite video information containing program material and control data to televisions for viewing the program material on the screens thereof, the video information having been produced by modulating selected viewing areas of the program material with the control data to produce a video subcarrier component, the component containing the data, the modulating having been performed in such manner that the modulation is substantially invisible to the television viewer, comprising, means adjacent the television for detecting the component to reproduce the data, and means responsive to such reproduced data for controlling at least one interactive device.
44. In conjunction with a method for producing a composite video signal containing video program material and control data, and displaying the signal on a television and decoding such control data for ancillary use, the improvement comprising modulating at least one video field within the viewing area of a television in such manner that the modulation is substantially invisible to the television viewer, the modulating being of alternate horizontal scan lines within the field, thereby producing a component of the signal which indicates the presence and sense of the data, and detecting the component to reproduce the data for the ancillary use.
45. A method for remotely controlling interactive devices by broadcasting composite video information to a television, comprising: producing a composite video signal containing program material and control data by modulating selected viewing areas of the program material with the control data, the modulating being of alternate horizontal scan lines within selected video fields of the program material, thereby creating a component of the signal which indicates the presence and sense of the data; broadcasting the signal to at least one television; receiving the signal at at least one television;
detecting, adjacent at least one television, the component to reproduce the data; and transmitting the data to enable interactive devices within range of the transmission to act, responsive to the program material, in a predetermined manner.
detecting, adjacent at least one television, the component to reproduce the data; and transmitting the data to enable interactive devices within range of the transmission to act, responsive to the program material, in a predetermined manner.
46. Apparatus for the remote control of interactive devices by the broadcast of composite video information to televisions, comprising: means for generating a program signal containing a video program; means for generating a data signal containing control data; means for subliminally modulating the program signal by the data signal in timed relation thereto, the modulating being of alternate horizontal scan lines within a video field and within the viewing area of at least one television, thereby producing a data-modulated video component detectable as digital modulation within the viewing area; means adjacent at least one television for detecting the modulation within the viewing area to produce a control data sequence; and means for controlling, in predetermined response to the data sequence, the actions of at least one of the interactive devices.
47. For use with a composite video signal containing program material for viewing on a television and control data for controlling at least one interactive device, wherein the presence and sense of the control data are defined by the presence, in the viewing area of the television, of substantially invisible luminance modulation within selected video fields, apparatus comprising, means adjacent the television for detecting the presence of luminance modulation within the selected video fields, the detecting means being responsive to substantially invisible luminance modulation, within the viewing area of the television, at a modulation frequency substantially greater than the field frequence of the television, thereby to reproduce the data, and means responsive to such reproduced data for controlling at least one interactive device.
48. For use in conjunction with a system which includes a video display that is luminance modulated to contain encoded data related to display activity, and a data-encoded luminance modulation-responsive translator capable of locally projecting, into a projection field, encoded light-borne information derived from such control data, a system-responsive interactive device including a receiver adapted to receive such projected information when within such field, a controller operatively connected to the receiver and specifically adapted to decode such information, thus to produce related control signals, and activity-producing means operatively coupled to the controller and responsive to the control signals to generate in the device activity which is related to the data contents of such luminance modulated video display, thus to coordinate device activity with display activity.
49. For use in conjunction with a system which includes a video display that is luminance modulated to contain encoded data related to display activity, and a data-encoded luminance modulation-responsive receiver/transmitter capable of transmitting over a predefined range a modulated light carrier, the light being within a predefined spectrum, the carrier being of a predefined frequence, and the light carrier being modulated by such data, a display activity-imitative interactive device including light responsive means adapted to respond to light within such predefined spectrum when within range of such transmission, carrier detecting means operatively connected to the light responsive means and tuned to such predefined carrier frequency, thus to produce a demodulated digital signal representative of the encoded data, a controller operatively connected to the carrier detecting means and specifically adapted to decode the data, thus to produce related control signals, and activity-producing means operatively coupled to the controller and responsive to the control signals to produce display activity-imitative device activity.
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Families Citing this family (423)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4965825A (en) | 1981-11-03 | 1990-10-23 | The Personalized Mass Media Corporation | Signal processing apparatus and methods |
USRE47642E1 (en) | 1981-11-03 | 2019-10-08 | Personalized Media Communications LLC | Signal processing apparatus and methods |
US7831204B1 (en) | 1981-11-03 | 2010-11-09 | Personalized Media Communications, Llc | Signal processing apparatus and methods |
US5697844A (en) * | 1986-03-10 | 1997-12-16 | Response Reward Systems, L.C. | System and method for playing games and rewarding successful players |
US5508731A (en) * | 1986-03-10 | 1996-04-16 | Response Reward Systems L.C. | Generation of enlarged participatory broadcast audience |
US4926255A (en) * | 1986-03-10 | 1990-05-15 | Kohorn H Von | System for evaluation of response to broadcast transmissions |
US5128752A (en) * | 1986-03-10 | 1992-07-07 | Kohorn H Von | System and method for generating and redeeming tokens |
US5251301A (en) * | 1988-05-27 | 1993-10-05 | Pc Connection, Inc. | Computer remote control through a video signal |
US4920503A (en) * | 1988-05-27 | 1990-04-24 | Pc Connection, Inc. | Computer remote control through a video signal |
US5213337A (en) * | 1988-07-06 | 1993-05-25 | Robert Sherman | System for communication using a broadcast audio signal |
US5128765A (en) * | 1988-11-29 | 1992-07-07 | Visual Subliminal Technologies, Inc. | System for implementing the synchronized superimposition of subliminal signals |
US5307173A (en) * | 1988-12-23 | 1994-04-26 | Gemstar Development Corporation | Apparatus and method using compressed codes for television program record scheduling |
CA2005070C (en) * | 1988-12-23 | 1999-04-27 | Henry C. Yuen | Apparatus and method for using encoded video recorder/player timer preprogramming information |
US6049652A (en) * | 1988-12-23 | 2000-04-11 | Gemstar Development Corporation | Apparatus and method using compressed codes for recorder preprogramming |
US5974222A (en) * | 1988-12-23 | 1999-10-26 | Gemstar Development Corporation | Apparatus and method using compressed codes for scheduling broadcast information recording |
US6430359B1 (en) | 1988-12-23 | 2002-08-06 | Gemstar Development Corporation | Apparatus and method using compressed codes for television program record scheduling |
US5191615A (en) * | 1990-01-17 | 1993-03-02 | The Drummer Group | Interrelational audio kinetic entertainment system |
US5121440A (en) * | 1990-08-30 | 1992-06-09 | Monolithic Resources Corporation | Analog video character recognition system |
US5093718A (en) * | 1990-09-28 | 1992-03-03 | Inteletext Systems, Inc. | Interactive home information system |
US5220420A (en) * | 1990-09-28 | 1993-06-15 | Inteletext Systems, Inc. | Interactive home information system for distributing compressed television programming |
US5200822A (en) * | 1991-04-23 | 1993-04-06 | National Broadcasting Company, Inc. | Arrangement for and method of processing data, especially for identifying and verifying airing of television broadcast programs |
FR2677471A1 (en) * | 1991-06-06 | 1992-12-11 | Ruault Jean Paul | DEVICES AND METHOD FOR ALLOWING INTERACTIVE PROGRAM PILOTAGE BETWEEN AN AUDIO-VISUAL DEVICE AND A TELEMATIC SYSTEM. |
US5410360A (en) * | 1991-06-14 | 1995-04-25 | Wavephore, Inc. | Timing control for injecting a burst and data into a video signal |
US5617148A (en) * | 1991-06-14 | 1997-04-01 | Wavephore, Inc. | Filter by-pass for transmitting an additional signal with a video signal |
US5387941A (en) * | 1991-06-14 | 1995-02-07 | Wavephore, Inc. | Data with video transmitter |
US5831679A (en) * | 1991-06-14 | 1998-11-03 | Wavephore, Inc. | Network for retrieval and video transmission of information |
US5327237A (en) * | 1991-06-14 | 1994-07-05 | Wavephore, Inc. | Transmitting data with video |
US5559559A (en) * | 1991-06-14 | 1996-09-24 | Wavephore, Inc. | Transmitting a secondary signal with dynamic injection level control |
JP2960803B2 (en) * | 1991-08-28 | 1999-10-12 | 株式会社日立製作所 | Digital broadcast signal receiving apparatus and digital broadcast signal receiving television receiver |
US5231488A (en) * | 1991-09-11 | 1993-07-27 | Franklin N. Eventoff | System for displaying and reading patterns displayed on a display unit |
US5734413A (en) * | 1991-11-20 | 1998-03-31 | Thomson Multimedia S.A. | Transaction based interactive television system |
US5343239A (en) * | 1991-11-20 | 1994-08-30 | Zing Systems, L.P. | Transaction based interactive television system |
US20010013123A1 (en) * | 1991-11-25 | 2001-08-09 | Freeman Michael J. | Customized program creation by splicing server based video, audio, or graphical segments |
US5861881A (en) * | 1991-11-25 | 1999-01-19 | Actv, Inc. | Interactive computer system for providing an interactive presentation with personalized video, audio and graphics responses for multiple viewers |
US5724091A (en) | 1991-11-25 | 1998-03-03 | Actv, Inc. | Compressed digital data interactive program system |
US6457177B1 (en) | 1992-05-01 | 2002-09-24 | Digitalconvergence.Com Inc. | Dual port interactive media system |
US5907793A (en) * | 1992-05-01 | 1999-05-25 | Reams; David A. | Telephone-based interactive broadcast or cable radio or television methods and apparatus |
US5249044A (en) * | 1992-05-05 | 1993-09-28 | Kohorn H Von | Product information storage, display, and coupon dispensing system |
US5721788A (en) | 1992-07-31 | 1998-02-24 | Corbis Corporation | Method and system for digital image signatures |
AU5363494A (en) * | 1992-10-19 | 1994-05-09 | Jeffrey Scott Jani | Video and radio controlled moving and talking device |
JP3101102B2 (en) * | 1992-12-02 | 2000-10-23 | 富士通株式会社 | Radio wave eavesdropping test equipment |
US5410326A (en) * | 1992-12-04 | 1995-04-25 | Goldstein; Steven W. | Programmable remote control device for interacting with a plurality of remotely controlled devices |
US5557334A (en) * | 1993-01-12 | 1996-09-17 | Visual Automation Systems, Inc. | Apparatus for tracking the flow of video signals by incorporating patterns of machine readable signals which will appear at predetermined locations of a television picture |
US5450134A (en) * | 1993-01-12 | 1995-09-12 | Visual Automation Systems, Inc. | Video facility management system for encoding and decoding video signals to facilitate identification of the video signals |
USRE37991E1 (en) * | 1993-01-12 | 2003-02-18 | Visual Automation Systems, Inc. | Apparatus for tracking the flow of video signals by incorportating patterns of machine readable signals which will appear at predetermined locations of a television picture |
US5404160A (en) * | 1993-06-24 | 1995-04-04 | Berkeley Varitronics Systems, Inc. | System and method for identifying a television program |
JPH0775076A (en) * | 1993-09-01 | 1995-03-17 | Sega Enterp Ltd | Interactive video method and device |
US5949476A (en) * | 1993-10-20 | 1999-09-07 | Cableshare, Inc. | Television system distributing a dynamically varying number of concurrent video presentations over a single television channel |
US5481294A (en) * | 1993-10-27 | 1996-01-02 | A. C. Nielsen Company | Audience measurement system utilizing ancillary codes and passive signatures |
US6983051B1 (en) * | 1993-11-18 | 2006-01-03 | Digimarc Corporation | Methods for audio watermarking and decoding |
US6424725B1 (en) | 1996-05-16 | 2002-07-23 | Digimarc Corporation | Determining transformations of media signals with embedded code signals |
US7676059B2 (en) * | 1994-10-21 | 2010-03-09 | Digimarc Corporation | Video steganography or encoding |
US6944298B1 (en) * | 1993-11-18 | 2005-09-13 | Digimare Corporation | Steganographic encoding and decoding of auxiliary codes in media signals |
US6122403A (en) | 1995-07-27 | 2000-09-19 | Digimarc Corporation | Computer system linked by using information in data objects |
ATE199469T1 (en) * | 1993-11-18 | 2001-03-15 | Digimarc Corp | VIDEO COPY CONTROL WITH VARIOUS EMBEDDED SIGNALS |
US5841978A (en) | 1993-11-18 | 1998-11-24 | Digimarc Corporation | Network linking method using steganographically embedded data objects |
US6681028B2 (en) | 1995-07-27 | 2004-01-20 | Digimarc Corporation | Paper-based control of computer systems |
US6611607B1 (en) | 1993-11-18 | 2003-08-26 | Digimarc Corporation | Integrating digital watermarks in multimedia content |
US6614914B1 (en) | 1995-05-08 | 2003-09-02 | Digimarc Corporation | Watermark embedder and reader |
US5748763A (en) | 1993-11-18 | 1998-05-05 | Digimarc Corporation | Image steganography system featuring perceptually adaptive and globally scalable signal embedding |
US5710834A (en) * | 1995-05-08 | 1998-01-20 | Digimarc Corporation | Method and apparatus responsive to a code signal conveyed through a graphic image |
US6516079B1 (en) | 2000-02-14 | 2003-02-04 | Digimarc Corporation | Digital watermark screening and detecting strategies |
US5841886A (en) * | 1993-11-18 | 1998-11-24 | Digimarc Corporation | Security system for photographic identification |
US5862260A (en) * | 1993-11-18 | 1999-01-19 | Digimarc Corporation | Methods for surveying dissemination of proprietary empirical data |
US5822436A (en) | 1996-04-25 | 1998-10-13 | Digimarc Corporation | Photographic products and methods employing embedded information |
US6408082B1 (en) | 1996-04-25 | 2002-06-18 | Digimarc Corporation | Watermark detection using a fourier mellin transform |
US7313251B2 (en) * | 1993-11-18 | 2007-12-25 | Digimarc Corporation | Method and system for managing and controlling electronic media |
US6449377B1 (en) * | 1995-05-08 | 2002-09-10 | Digimarc Corporation | Methods and systems for watermark processing of line art images |
US6681029B1 (en) | 1993-11-18 | 2004-01-20 | Digimarc Corporation | Decoding steganographic messages embedded in media signals |
US5748783A (en) * | 1995-05-08 | 1998-05-05 | Digimarc Corporation | Method and apparatus for robust information coding |
USRE40919E1 (en) * | 1993-11-18 | 2009-09-22 | Digimarc Corporation | Methods for surveying dissemination of proprietary empirical data |
US20020009208A1 (en) * | 1995-08-09 | 2002-01-24 | Adnan Alattar | Authentication of physical and electronic media objects using digital watermarks |
US5768426A (en) * | 1993-11-18 | 1998-06-16 | Digimarc Corporation | Graphics processing system employing embedded code signals |
US5832119C1 (en) * | 1993-11-18 | 2002-03-05 | Digimarc Corp | Methods for controlling systems using control signals embedded in empirical data |
US6574350B1 (en) | 1995-05-08 | 2003-06-03 | Digimarc Corporation | Digital watermarking employing both frail and robust watermarks |
US6636615B1 (en) | 1998-01-20 | 2003-10-21 | Digimarc Corporation | Methods and systems using multiple watermarks |
US7171016B1 (en) | 1993-11-18 | 2007-01-30 | Digimarc Corporation | Method for monitoring internet dissemination of image, video and/or audio files |
US7044395B1 (en) | 1993-11-18 | 2006-05-16 | Digimarc Corporation | Embedding and reading imperceptible codes on objects |
US5636292C1 (en) * | 1995-05-08 | 2002-06-18 | Digimarc Corp | Steganography methods employing embedded calibration data |
US5488571A (en) * | 1993-11-22 | 1996-01-30 | Timex Corporation | Method and apparatus for downloading information from a controllable light source to a portable information device |
US5880769A (en) * | 1994-01-19 | 1999-03-09 | Smarttv Co. | Interactive smart card system for integrating the provision of remote and local services |
US5594493A (en) * | 1994-01-19 | 1997-01-14 | Nemirofsky; Frank R. | Television signal activated interactive smart card system |
US7039214B2 (en) * | 1999-11-05 | 2006-05-02 | Digimarc Corporation | Embedding watermark components during separate printing stages |
US6869023B2 (en) * | 2002-02-12 | 2005-03-22 | Digimarc Corporation | Linking documents through digital watermarking |
US6968057B2 (en) * | 1994-03-17 | 2005-11-22 | Digimarc Corporation | Emulsion products and imagery employing steganography |
US6522770B1 (en) | 1999-05-19 | 2003-02-18 | Digimarc Corporation | Management of documents and other objects using optical devices |
US5537141A (en) * | 1994-04-15 | 1996-07-16 | Actv, Inc. | Distance learning system providing individual television participation, audio responses and memory for every student |
AU2390895A (en) * | 1994-04-20 | 1995-11-16 | Shoot The Moon Products, Inc. | Method and apparatus for nesting secondary signals within a television signal |
US5517251A (en) * | 1994-04-28 | 1996-05-14 | The Regents Of The University Of California | Acquisition of video images simultaneously with analog signals |
CN1140115C (en) | 1994-05-16 | 2004-02-25 | 杰姆斯达发展公司 | Television program record scheduling and satellite receiver control using compressed codes |
US5953046A (en) * | 1994-05-31 | 1999-09-14 | Pocock; Michael H. | Television system with multiple video presentations on a single channel |
US5739864A (en) * | 1994-08-24 | 1998-04-14 | Macrovision Corporation | Apparatus for inserting blanked formatted fingerprint data (source ID, time/date) in to a video signal |
US5733131A (en) * | 1994-07-29 | 1998-03-31 | Seiko Communications Holding N.V. | Education and entertainment device with dynamic configuration and operation |
US5632007A (en) * | 1994-09-23 | 1997-05-20 | Actv, Inc. | Interactive system and method for offering expert based interactive programs |
US8094949B1 (en) | 1994-10-21 | 2012-01-10 | Digimarc Corporation | Music methods and systems |
US6560349B1 (en) * | 1994-10-21 | 2003-05-06 | Digimarc Corporation | Audio monitoring using steganographic information |
US6879701B1 (en) | 1994-10-21 | 2005-04-12 | Digimarc Corporation | Tile-based digital watermarking techniques |
US7724919B2 (en) * | 1994-10-21 | 2010-05-25 | Digimarc Corporation | Methods and systems for steganographic processing |
EP0710022A3 (en) * | 1994-10-31 | 1998-08-26 | AT&T Corp. | System and method for encoding digital information in a television signal |
EP0713335A2 (en) | 1994-11-15 | 1996-05-22 | AT&T Corp. | System and method for wireless capture of encoded data transmitted with a television, video or audio signal and subsequent initiation of a transaction using such data |
KR960020437A (en) | 1994-11-18 | 1996-06-17 | 사또오 후미오 | Signal Transmitter and Receiver |
US6321208B1 (en) | 1995-04-19 | 2001-11-20 | Brightstreet.Com, Inc. | Method and system for electronic distribution of product redemption coupons |
US6760463B2 (en) * | 1995-05-08 | 2004-07-06 | Digimarc Corporation | Watermarking methods and media |
US7555139B2 (en) * | 1995-05-08 | 2009-06-30 | Digimarc Corporation | Secure documents with hidden signals, and related methods and systems |
US6721440B2 (en) | 1995-05-08 | 2004-04-13 | Digimarc Corporation | Low visibility watermarks using an out-of-phase color |
US7224819B2 (en) | 1995-05-08 | 2007-05-29 | Digimarc Corporation | Integrating digital watermarks in multimedia content |
US6744906B2 (en) | 1995-05-08 | 2004-06-01 | Digimarc Corporation | Methods and systems using multiple watermarks |
US6738495B2 (en) | 1995-05-08 | 2004-05-18 | Digimarc Corporation | Watermarking enhanced to withstand anticipated corruptions |
US20030133592A1 (en) * | 1996-05-07 | 2003-07-17 | Rhoads Geoffrey B. | Content objects with computer instructions steganographically encoded therein, and associated methods |
US7805500B2 (en) * | 1995-05-08 | 2010-09-28 | Digimarc Corporation | Network linking methods and apparatus |
US6590996B1 (en) | 2000-02-14 | 2003-07-08 | Digimarc Corporation | Color adaptive watermarking |
US7486799B2 (en) * | 1995-05-08 | 2009-02-03 | Digimarc Corporation | Methods for monitoring audio and images on the internet |
US5953418A (en) * | 1995-06-14 | 1999-09-14 | David Hall | Providing selective data broadcast receiver addressability |
US6064420A (en) * | 1995-06-15 | 2000-05-16 | Intel Corporation | Simulating two way connectivity for one way data streams for multiple parties |
AU6477596A (en) * | 1995-06-15 | 1997-01-15 | Hall, David | Communication system for superimposing data onto a video signal |
US7917386B2 (en) | 1995-06-16 | 2011-03-29 | Catalina Marketing Corporation | Virtual couponing method and apparatus for use with consumer kiosk |
US5682196A (en) * | 1995-06-22 | 1997-10-28 | Actv, Inc. | Three-dimensional (3D) video presentation system providing interactive 3D presentation with personalized audio responses for multiple viewers |
US20020178051A1 (en) * | 1995-07-25 | 2002-11-28 | Thomas G. Scavone | Interactive marketing network and process using electronic certificates |
US7711564B2 (en) * | 1995-07-27 | 2010-05-04 | Digimarc Corporation | Connected audio and other media objects |
US6650761B1 (en) * | 1999-05-19 | 2003-11-18 | Digimarc Corporation | Watermarked business cards and methods |
US6788800B1 (en) | 2000-07-25 | 2004-09-07 | Digimarc Corporation | Authenticating objects using embedded data |
US6829368B2 (en) * | 2000-01-26 | 2004-12-07 | Digimarc Corporation | Establishing and interacting with on-line media collections using identifiers in media signals |
US7051086B2 (en) | 1995-07-27 | 2006-05-23 | Digimarc Corporation | Method of linking on-line data to printed documents |
US7171018B2 (en) | 1995-07-27 | 2007-01-30 | Digimarc Corporation | Portable devices and methods employing digital watermarking |
US6965682B1 (en) | 1999-05-19 | 2005-11-15 | Digimarc Corp | Data transmission by watermark proxy |
US6408331B1 (en) | 1995-07-27 | 2002-06-18 | Digimarc Corporation | Computer linking methods using encoded graphics |
US7003731B1 (en) | 1995-07-27 | 2006-02-21 | Digimare Corporation | User control and activation of watermark enabled objects |
US6505160B1 (en) * | 1995-07-27 | 2003-01-07 | Digimarc Corporation | Connected audio and other media objects |
US6577746B1 (en) * | 1999-12-28 | 2003-06-10 | Digimarc Corporation | Watermark-based object linking and embedding |
US7006661B2 (en) * | 1995-07-27 | 2006-02-28 | Digimarc Corp | Digital watermarking systems and methods |
US7562392B1 (en) | 1999-05-19 | 2009-07-14 | Digimarc Corporation | Methods of interacting with audio and ambient music |
US6411725B1 (en) * | 1995-07-27 | 2002-06-25 | Digimarc Corporation | Watermark enabled video objects |
US5805211A (en) * | 1995-09-15 | 1998-09-08 | Hartson; Ted E. | Electrostatic probe device for signal detection of cathode ray tube displays |
FR2743230B1 (en) * | 1995-12-28 | 1998-02-06 | Asulab Sa | DATA TRANSMISSION SYSTEM INCLUDING A DATA TRANSMITTER AND A PORTABLE INFORMATION DETECTION DEVICE FOR RECEIVING SUCH DATA |
FR2743244B1 (en) * | 1995-12-29 | 1998-04-03 | Parment Philippe | METHOD FOR TRANSMITTING INFORMATION |
US5672108A (en) * | 1996-01-16 | 1997-09-30 | Tiger Electronics, Inc. | Electronic game with separate emitter |
CA2195037C (en) * | 1996-01-25 | 2001-03-20 | Theodore Ii Sizer | System and method for encoding digital information in a television signal |
US5835388A (en) * | 1996-03-26 | 1998-11-10 | Timex Corporation | Apparatus and method for optical transmission of serial data using a serial communications port |
US20030056103A1 (en) * | 2000-12-18 | 2003-03-20 | Levy Kenneth L. | Audio/video commerce application architectural framework |
US7715446B2 (en) * | 1996-04-25 | 2010-05-11 | Digimarc Corporation | Wireless methods and devices employing plural-bit data derived from audio information |
US7412072B2 (en) * | 1996-05-16 | 2008-08-12 | Digimarc Corporation | Variable message coding protocols for encoding auxiliary data in media signals |
US6381341B1 (en) | 1996-05-16 | 2002-04-30 | Digimarc Corporation | Watermark encoding method exploiting biases inherent in original signal |
US5889548A (en) * | 1996-05-28 | 1999-03-30 | Nielsen Media Research, Inc. | Television receiver use metering with separate program and sync detectors |
US5915243A (en) * | 1996-08-29 | 1999-06-22 | Smolen; Daniel T. | Method and apparatus for delivering consumer promotions |
US6647548B1 (en) | 1996-09-06 | 2003-11-11 | Nielsen Media Research, Inc. | Coded/non-coded program audience measurement system |
US6052556A (en) * | 1996-09-27 | 2000-04-18 | Sharp Laboratories Of America | Interactivity enhancement apparatus for consumer electronics products |
US8005254B2 (en) * | 1996-11-12 | 2011-08-23 | Digimarc Corporation | Background watermark processing |
US5903231A (en) * | 1996-12-16 | 1999-05-11 | Vidicast Ltd. | System for encoding base N data using a multi-level coding scheme |
US6122010A (en) * | 1996-12-16 | 2000-09-19 | Vidicast Ltd. | Television signal data transmission system |
GB9700854D0 (en) * | 1997-01-16 | 1997-03-05 | Scient Generics Ltd | Sub-audible acoustic data transmission mechanism |
JPH10210570A (en) * | 1997-01-23 | 1998-08-07 | Sony Corp | Remote control transmitter and information transfer system using it |
US5986623A (en) * | 1997-02-03 | 1999-11-16 | Microsoft Corporation | System and method for interlaced display device data transmission |
US6415439B1 (en) | 1997-02-04 | 2002-07-02 | Microsoft Corporation | Protocol for a wireless control system |
US5977951A (en) * | 1997-02-04 | 1999-11-02 | Microsoft Corporation | System and method for substituting an animated character when a remote control physical character is unavailable |
US6317714B1 (en) | 1997-02-04 | 2001-11-13 | Microsoft Corporation | Controller and associated mechanical characters operable for continuously performing received control data while engaging in bidirectional communications over a single communications channel |
US6130726A (en) * | 1997-03-24 | 2000-10-10 | Evolve Products, Inc. | Program guide on a remote control display |
US20050097594A1 (en) * | 1997-03-24 | 2005-05-05 | O'donnell Frank | Systems and methods for awarding affinity points based upon remote control usage |
US6211919B1 (en) * | 1997-03-28 | 2001-04-03 | Tektronix, Inc. | Transparent embedment of data in a video signal |
US6125172A (en) * | 1997-04-18 | 2000-09-26 | Lucent Technologies, Inc. | Apparatus and method for initiating a transaction having acoustic data receiver that filters human voice |
US6118490A (en) * | 1997-05-01 | 2000-09-12 | Interactive Learning Group, Inc. | Display based optical communication system |
US5904621A (en) * | 1997-06-25 | 1999-05-18 | Tiger Electronics, Ltd. | Electronic game with infrared emitter and sensor |
CA2294948C (en) * | 1997-06-30 | 2005-03-22 | Microsoft Corporation | Method and system for encoding data in the horizontal overscan portion of a video signal |
US5912454A (en) * | 1997-06-30 | 1999-06-15 | Microsoft Corporation | System and method for detecting a relative change in light intensity |
US6032548A (en) * | 1997-08-08 | 2000-03-07 | Del Castillo; Leonardo | System and method for creating movement utilizing a servo mechanism with a self-aligning clutch |
EP0901282B1 (en) | 1997-09-03 | 2006-06-28 | Hitachi, Ltd. | Method for recording and reproducing electronic watermark information |
US6094228A (en) * | 1997-10-28 | 2000-07-25 | Ciardullo; Daniel Andrew | Method for transmitting data on viewable portion of a video signal |
WO2001006781A1 (en) * | 1998-03-23 | 2001-01-25 | Koplar Interactive Systems International | Method for transmitting data on viewable portion of a video signal |
US6205582B1 (en) | 1997-12-09 | 2001-03-20 | Ictv, Inc. | Interactive cable television system with frame server |
US7054463B2 (en) | 1998-01-20 | 2006-05-30 | Digimarc Corporation | Data encoding using frail watermarks |
US6661905B1 (en) * | 1998-03-23 | 2003-12-09 | Koplar Interactive Systems International Llc | Method for transmitting data on a viewable portion of a video signal |
US6389055B1 (en) * | 1998-03-30 | 2002-05-14 | Lucent Technologies, Inc. | Integrating digital data with perceptible signals |
US7689532B1 (en) | 2000-07-20 | 2010-03-30 | Digimarc Corporation | Using embedded data with file sharing |
JP3358532B2 (en) * | 1998-04-27 | 2002-12-24 | 日本電気株式会社 | Receiving device using electronic watermark |
US6593972B1 (en) * | 1998-05-12 | 2003-07-15 | Clark E. Johnson, Jr. | Interactive display system |
US6100916A (en) * | 1998-05-20 | 2000-08-08 | Lucent Technologies Inc. | System and method for subscriber controlled signal blocking |
US7644282B2 (en) | 1998-05-28 | 2010-01-05 | Verance Corporation | Pre-processed information embedding system |
US7055034B1 (en) * | 1998-09-25 | 2006-05-30 | Digimarc Corporation | Method and apparatus for robust embedded data |
US6778678B1 (en) * | 1998-10-02 | 2004-08-17 | Lucent Technologies, Inc. | High-capacity digital image watermarking based on waveform modulation of image components |
US8290202B2 (en) * | 1998-11-03 | 2012-10-16 | Digimarc Corporation | Methods utilizing steganography |
US6215526B1 (en) * | 1998-11-06 | 2001-04-10 | Tivo, Inc. | Analog video tagging and encoding system |
US7296282B1 (en) | 1999-01-22 | 2007-11-13 | Koplar Interactive Systems International Llc | Interactive optical cards and other hand-held devices with increased connectivity |
US6483906B1 (en) | 1999-01-22 | 2002-11-19 | Pointset Corporation | Method and apparatus for setting programmable features of an appliance |
US6415023B2 (en) | 1999-01-22 | 2002-07-02 | Pointset Corporation | Method and apparatus for setting programmable features of an appliance |
US6882712B1 (en) | 1999-01-22 | 2005-04-19 | Pointset Corporation | Method and apparatus for setting programmable features of an appliance |
US6256378B1 (en) | 1999-01-22 | 2001-07-03 | Pointset Corporation | Method and apparatus for setting programmable features of an appliance |
US7415102B2 (en) * | 1999-01-22 | 2008-08-19 | Pointset Corporation | Method and apparatus for setting programmable features of an appliance |
US7289611B2 (en) * | 1999-01-22 | 2007-10-30 | Pointset Corporation | Method and apparatus for setting programmable features of motor vehicle |
US6735776B1 (en) | 1999-02-01 | 2004-05-11 | Kim R. Legate | Motion picture editing and distribution |
US6353635B1 (en) | 1999-02-12 | 2002-03-05 | Microsoft Corporation | Method for simultaneously controlling multiple devices using a single communication channel |
US7749089B1 (en) | 1999-02-26 | 2010-07-06 | Creative Kingdoms, Llc | Multi-media interactive play system |
US6847373B1 (en) * | 1999-04-16 | 2005-01-25 | Avid Technology, Inc. | Natural color matching in a video editing system |
US7302574B2 (en) * | 1999-05-19 | 2007-11-27 | Digimarc Corporation | Content identifiers triggering corresponding responses through collaborative processing |
US20070055884A1 (en) * | 1999-05-19 | 2007-03-08 | Rhoads Geoffrey B | User control and activation of watermark enabled objects |
US7261612B1 (en) | 1999-08-30 | 2007-08-28 | Digimarc Corporation | Methods and systems for read-aloud books |
US7565294B2 (en) * | 1999-05-19 | 2009-07-21 | Digimarc Corporation | Methods and systems employing digital content |
US20010034705A1 (en) * | 1999-05-19 | 2001-10-25 | Rhoads Geoffrey B. | Payment-based systems for internet music |
US8103542B1 (en) | 1999-06-29 | 2012-01-24 | Digimarc Corporation | Digitally marked objects and promotional methods |
US6281820B1 (en) | 1999-07-12 | 2001-08-28 | Pointset Corporation | Methods and apparatus for transferring data from a display screen |
EP1210818A1 (en) * | 1999-07-14 | 2002-06-05 | Koplar Interactive Systems International, LLC | Method for transmitting data on viewable portion of a video signal |
GB9917985D0 (en) | 1999-07-30 | 1999-09-29 | Scient Generics Ltd | Acoustic communication system |
US7502759B2 (en) * | 1999-08-30 | 2009-03-10 | Digimarc Corporation | Digital watermarking methods and related toy and game applications |
US9451310B2 (en) | 1999-09-21 | 2016-09-20 | Quantum Stream Inc. | Content distribution system and method |
GB2345779B (en) * | 1999-10-12 | 2004-08-11 | Roke Manor Research | Apparatus for controlling a remote item |
WO2001033836A1 (en) * | 1999-10-30 | 2001-05-10 | Roke Manor Research Limited | Improved interactive communications apparatus and method |
US6608919B1 (en) * | 1999-11-10 | 2003-08-19 | Digimarc Corporation | Method and apparatus for encoding paper with information |
BE1013189A3 (en) * | 1999-12-21 | 2001-10-02 | Image Line Bvba | Method and device for controlling an object and image remotely for an imagecarrier suitable for application in this method |
US6937289B1 (en) * | 1999-12-30 | 2005-08-30 | Microsoft Corporation | Method and system for downloading and storing interactive device content using the horizontal overscan portion of a video signal |
US6556247B1 (en) | 1999-12-30 | 2003-04-29 | Microsoft Corporation | Method and system for decoding data in the horizontal overscan portion of a video signal |
US6704058B2 (en) | 1999-12-30 | 2004-03-09 | Microsoft Corporation | System and method of adaptive timing estimation for horizontal overscan data |
US7150028B1 (en) | 1999-12-30 | 2006-12-12 | Microsoft Corporation | Method and system for downloading, storing and displaying coupon data using the horizontal overscan portion of a video signal |
US6625297B1 (en) * | 2000-02-10 | 2003-09-23 | Digimarc Corporation | Self-orienting watermarks |
US7478240B1 (en) | 2000-02-11 | 2009-01-13 | Alcatel-Lucent Usa Inc. | Method and system for capture of location specific media related information and delivery through communications network |
EP1237636B1 (en) * | 2000-02-11 | 2004-06-23 | Mattel, Inc. | Animated toy figure resting upon and responsive to computer monitor |
US6737957B1 (en) | 2000-02-16 | 2004-05-18 | Verance Corporation | Remote control signaling using audio watermarks |
US7878905B2 (en) * | 2000-02-22 | 2011-02-01 | Creative Kingdoms, Llc | Multi-layered interactive play experience |
US6761637B2 (en) | 2000-02-22 | 2004-07-13 | Creative Kingdoms, Llc | Method of game play using RFID tracking device |
US7445550B2 (en) | 2000-02-22 | 2008-11-04 | Creative Kingdoms, Llc | Magical wand and interactive play experience |
AU2001237552A1 (en) * | 2000-03-01 | 2001-09-12 | Peter Ernest Hookam-Miller | Presenting programs |
US7127744B2 (en) | 2000-03-10 | 2006-10-24 | Digimarc Corporation | Method and apparatus to protect media existing in an insecure format |
US8531276B2 (en) * | 2000-03-15 | 2013-09-10 | Logitech Europe S.A. | State-based remote control system |
US20010033243A1 (en) * | 2000-03-15 | 2001-10-25 | Harris Glen Mclean | Online remote control configuration system |
US6784805B2 (en) | 2000-03-15 | 2004-08-31 | Intrigue Technologies Inc. | State-based remote control system |
US8473342B1 (en) | 2000-04-05 | 2013-06-25 | Catalina Marketing Corporation | Method and system for generating certificates having unique Id data |
US7213254B2 (en) * | 2000-04-07 | 2007-05-01 | Koplar Interactive Systems International Llc | Universal methods and device for hand-held promotional opportunities |
WO2001080169A1 (en) * | 2000-04-17 | 2001-10-25 | Digimarc Corporation | Authentication of physical and electronic media objects using digital watermarks |
US6912295B2 (en) * | 2000-04-19 | 2005-06-28 | Digimarc Corporation | Enhancing embedding of out-of-phase signals |
US7027614B2 (en) * | 2000-04-19 | 2006-04-11 | Digimarc Corporation | Hiding information to reduce or offset perceptible artifacts |
US6804377B2 (en) | 2000-04-19 | 2004-10-12 | Digimarc Corporation | Detecting information hidden out-of-phase in color channels |
US7111168B2 (en) * | 2000-05-01 | 2006-09-19 | Digimarc Corporation | Digital watermarking systems |
US8121843B2 (en) * | 2000-05-02 | 2012-02-21 | Digimarc Corporation | Fingerprint methods and systems for media signals |
US6970886B1 (en) * | 2000-05-25 | 2005-11-29 | Digimarc Corporation | Consumer driven methods for associating content indentifiers with related web addresses |
WO2002033954A2 (en) | 2000-10-17 | 2002-04-25 | Digimarc Corporation | User control and activation of watermark enabled objects |
US7066781B2 (en) | 2000-10-20 | 2006-06-27 | Denise Chapman Weston | Children's toy with wireless tag/transponder |
BR0107444A (en) * | 2000-11-08 | 2002-10-08 | Koninkl Philips Electronics Nv | Method for communicating a command to a controllable device, arrangement for remotely controlling a controllable device, control device arranged to communicate a command in a first domain to a controllable device, controllable device arranged to receive a command in a first domain from a device control, computer program product, method for presenting an ad to a user, and, sign |
AU2211102A (en) | 2000-11-30 | 2002-06-11 | Scient Generics Ltd | Acoustic communication system |
ES2388357T3 (en) * | 2000-11-30 | 2012-10-11 | Intrasonics S.A.R.L. | Mobile phone to collect audience index data |
US7266704B2 (en) * | 2000-12-18 | 2007-09-04 | Digimarc Corporation | User-friendly rights management systems and methods |
US8055899B2 (en) * | 2000-12-18 | 2011-11-08 | Digimarc Corporation | Systems and methods using digital watermarking and identifier extraction to provide promotional opportunities |
US8301453B2 (en) | 2000-12-21 | 2012-10-30 | Digimarc Corporation | Watermark synchronization signals conveying payload data |
US8103877B2 (en) * | 2000-12-21 | 2012-01-24 | Digimarc Corporation | Content identification and electronic tickets, coupons and credits |
US6965683B2 (en) * | 2000-12-21 | 2005-11-15 | Digimarc Corporation | Routing networks for use with watermark systems |
WO2002051063A1 (en) | 2000-12-21 | 2002-06-27 | Digimarc Corporation | Methods, apparatus and programs for generating and utilizing content signatures |
US7072487B2 (en) * | 2001-01-26 | 2006-07-04 | Digimarc Corporation | Watermark detection using adaptive color projections |
US20020162118A1 (en) * | 2001-01-30 | 2002-10-31 | Levy Kenneth L. | Efficient interactive TV |
US7061510B2 (en) | 2001-03-05 | 2006-06-13 | Digimarc Corporation | Geo-referencing of aerial imagery using embedded image identifiers and cross-referenced data sets |
US7248715B2 (en) * | 2001-04-06 | 2007-07-24 | Digimarc Corporation | Digitally watermarking physical media |
US7822969B2 (en) * | 2001-04-16 | 2010-10-26 | Digimarc Corporation | Watermark systems and methods |
US20020183102A1 (en) * | 2001-04-21 | 2002-12-05 | Withers James G. | RBDS method and device for processing promotional opportunities |
US8457346B2 (en) * | 2001-04-24 | 2013-06-04 | Digimarc Corporation | Digital watermarking image signals on-chip |
US7046819B2 (en) * | 2001-04-25 | 2006-05-16 | Digimarc Corporation | Encoded reference signal for digital watermarks |
US7958359B2 (en) * | 2001-04-30 | 2011-06-07 | Digimarc Corporation | Access control systems |
US7502937B2 (en) * | 2001-04-30 | 2009-03-10 | Digimarc Corporation | Digital watermarking security systems |
US7305691B2 (en) * | 2001-05-07 | 2007-12-04 | Actv, Inc. | System and method for providing targeted programming outside of the home |
US20020194589A1 (en) * | 2001-05-08 | 2002-12-19 | Cristofalo Michael | Technique for optimizing the delivery of advertisements and other programming segments by making bandwidth tradeoffs |
US7340076B2 (en) * | 2001-05-10 | 2008-03-04 | Digimarc Corporation | Digital watermarks for unmanned vehicle navigation |
GB2375923A (en) * | 2001-05-25 | 2002-11-27 | Roke Manor Research | Recognising and extracting embedded data in a broadcast signal |
US20050086697A1 (en) * | 2001-07-02 | 2005-04-21 | Haseltine Eric C. | Processes for exploiting electronic tokens to increase broadcasting revenue |
US20030014748A1 (en) * | 2001-07-16 | 2003-01-16 | Gal Ben-David | Methods for data transmission |
US20030058707A1 (en) * | 2001-09-12 | 2003-03-27 | Dilger Bruce C. | System and process for implementing commercial breaks in programming |
US9135811B2 (en) * | 2001-09-27 | 2015-09-15 | Universal Electronics Inc. | Two way communication between an appliance and a remote control |
US7193661B2 (en) | 2001-09-27 | 2007-03-20 | Universal Electronics Inc. | Two way communication using light links |
US7392392B2 (en) * | 2001-12-13 | 2008-06-24 | Digimarc Corporation | Forensic digital watermarking with variable orientation and protocols |
US7392394B2 (en) * | 2001-12-13 | 2008-06-24 | Digimarc Corporation | Digital watermarking with variable orientation and protocols |
PT1456810E (en) | 2001-12-18 | 2011-07-25 | L 1 Secure Credentialing Inc | Multiple image security features for identification documents and methods of making same |
US7728048B2 (en) * | 2002-12-20 | 2010-06-01 | L-1 Secure Credentialing, Inc. | Increasing thermal conductivity of host polymer used with laser engraving methods and compositions |
EP1459239B1 (en) * | 2001-12-24 | 2012-04-04 | L-1 Secure Credentialing, Inc. | Covert variable information on id documents and methods of making same |
EP1459246B1 (en) * | 2001-12-24 | 2012-05-02 | L-1 Secure Credentialing, Inc. | Method for full color laser marking of id documents |
US7694887B2 (en) * | 2001-12-24 | 2010-04-13 | L-1 Secure Credentialing, Inc. | Optically variable personalized indicia for identification documents |
US8248528B2 (en) * | 2001-12-24 | 2012-08-21 | Intrasonics S.A.R.L. | Captioning system |
US7152786B2 (en) * | 2002-02-12 | 2006-12-26 | Digimarc Corporation | Identification document including embedded data |
TR200402517T1 (en) * | 2002-03-29 | 2007-12-24 | Innogenetics N.V. | HBV drug resistance detection methods |
JP3783645B2 (en) * | 2002-04-05 | 2006-06-07 | 株式会社日立製作所 | Contrast adjustment method, contrast adjustment circuit, and video display device using the same |
US20070066396A1 (en) | 2002-04-05 | 2007-03-22 | Denise Chapman Weston | Retail methods for providing an interactive product to a consumer |
US6967566B2 (en) | 2002-04-05 | 2005-11-22 | Creative Kingdoms, Llc | Live-action interactive adventure game |
US7824029B2 (en) | 2002-05-10 | 2010-11-02 | L-1 Secure Credentialing, Inc. | Identification card printer-assembler for over the counter card issuing |
US7899915B2 (en) | 2002-05-10 | 2011-03-01 | Richard Reisman | Method and apparatus for browsing using multiple coordinated device sets |
US7075899B2 (en) * | 2002-05-21 | 2006-07-11 | Actv, Inc. | System and method for providing private in-band data to digital set-top boxes in a broadcast environment |
US7974495B2 (en) * | 2002-06-10 | 2011-07-05 | Digimarc Corporation | Identification and protection of video |
US20040125125A1 (en) * | 2002-06-29 | 2004-07-01 | Levy Kenneth L. | Embedded data windows in audio sequences and video frames |
US20040091111A1 (en) * | 2002-07-16 | 2004-05-13 | Levy Kenneth L. | Digital watermarking and fingerprinting applications |
US7440034B2 (en) * | 2002-08-20 | 2008-10-21 | Optinetix (Israel) Ltd. | Method and apparatus for transferring data within viewable portion of video signal |
US7303471B2 (en) * | 2002-08-27 | 2007-12-04 | Micron Technology, Inc. | Method and system for transferring data to an electronic toy or other electronic device |
US20040055019A1 (en) * | 2002-09-12 | 2004-03-18 | Koninklijke Philips Electronics N.V. | Method for controlling an apparatus with a broadcast signal and apparatus therefor |
US7650624B2 (en) * | 2002-10-01 | 2010-01-19 | Koplar Interactive Systems International, L.L.C. | Method and apparatus for modulating a video signal with data |
EP2782337A3 (en) | 2002-10-15 | 2014-11-26 | Verance Corporation | Media monitoring, management and information system |
AU2003285891A1 (en) * | 2002-10-15 | 2004-05-04 | Digimarc Corporation | Identification document and related methods |
US7978874B2 (en) * | 2002-10-21 | 2011-07-12 | Digimarc Corporation | Digital watermarking for workflow by tracking content or content identifiers with respect to time |
US7804982B2 (en) | 2002-11-26 | 2010-09-28 | L-1 Secure Credentialing, Inc. | Systems and methods for managing and detecting fraud in image databases used with identification documents |
US20040117840A1 (en) * | 2002-12-12 | 2004-06-17 | Boudreau Paul A. | Data enhanced multi-media system for a set-top terminal |
US20040117858A1 (en) * | 2002-12-12 | 2004-06-17 | Boudreau Paul A. | Data enhanced multi-media system for an external device |
US7712673B2 (en) | 2002-12-18 | 2010-05-11 | L-L Secure Credentialing, Inc. | Identification document with three dimensional image of bearer |
WO2004073168A2 (en) * | 2003-02-07 | 2004-08-26 | Warner Bros. Entertainment Inc. | Methods for encoding data in an analog video signal such that it survives resolution conversion |
US9446319B2 (en) | 2003-03-25 | 2016-09-20 | Mq Gaming, Llc | Interactive gaming toy |
US7626635B2 (en) * | 2003-04-04 | 2009-12-01 | Koplar Interactive Systems International, L.L.C. | Method and system of detecting signal presence from a video signal presented on a digital display device |
DE602004030434D1 (en) | 2003-04-16 | 2011-01-20 | L 1 Secure Credentialing Inc | THREE-DIMENSIONAL DATA STORAGE |
US20050044387A1 (en) * | 2003-08-18 | 2005-02-24 | Ozolins Helmars E. | Portable access device |
US7330511B2 (en) * | 2003-08-18 | 2008-02-12 | Koplar Interactive Systems International, L.L.C. | Method and system for embedding device positional data in video signals |
US7116374B2 (en) * | 2003-08-26 | 2006-10-03 | Koplar Interactive Systems International, L.L.C. | Method and system for enhanced modulation of video signals |
TWM246707U (en) * | 2003-08-26 | 2004-10-11 | Behavior Tech Computer Corp | Wireless man machine interface device |
TWI232681B (en) * | 2003-08-27 | 2005-05-11 | Mediatek Inc | Method of transforming one video output format into another video output format without degrading display quality |
US7786987B2 (en) | 2003-09-25 | 2010-08-31 | The Nielsen Company (Us), Llc | Methods and apparatus to detect an operating state of a display based on visible light |
US9027043B2 (en) | 2003-09-25 | 2015-05-05 | The Nielsen Company (Us), Llc | Methods and apparatus to detect an operating state of a display |
US9055239B2 (en) * | 2003-10-08 | 2015-06-09 | Verance Corporation | Signal continuity assessment using embedded watermarks |
US7369677B2 (en) | 2005-04-26 | 2008-05-06 | Verance Corporation | System reactions to the detection of embedded watermarks in a digital host content |
US20070039018A1 (en) * | 2005-08-09 | 2007-02-15 | Verance Corporation | Apparatus, systems and methods for broadcast advertising stewardship |
US20060239501A1 (en) | 2005-04-26 | 2006-10-26 | Verance Corporation | Security enhancements of digital watermarks for multi-media content |
US7075583B2 (en) * | 2003-10-20 | 2006-07-11 | Koplar Interactive Systems International, L.L.C. | Methods for improved modulation of video signals |
WO2005043902A1 (en) * | 2003-10-20 | 2005-05-12 | Koplar Interactive Systems International, L.L.C. | Methods for improved modulation of video signals |
US7587121B1 (en) | 2003-10-23 | 2009-09-08 | Koplar Interactive Systems International, L.L.C. | Method and system for multiple field modulation |
US20050148277A1 (en) * | 2004-01-02 | 2005-07-07 | Stephen Lister | Interactive command-repeater toy system |
US20050194456A1 (en) | 2004-03-02 | 2005-09-08 | Tessier Patrick C. | Wireless controller with gateway |
US7744002B2 (en) * | 2004-03-11 | 2010-06-29 | L-1 Secure Credentialing, Inc. | Tamper evident adhesive and identification document including same |
US20050264545A1 (en) * | 2004-05-27 | 2005-12-01 | Walker Ray A | Method and system for determining the location of a movable icon on a display surface |
US7664175B1 (en) | 2004-06-16 | 2010-02-16 | Koplar Interactive Systems International, L.L.C. | Mark-based content modulation and detection |
US7668334B2 (en) | 2004-07-02 | 2010-02-23 | Digimarc Corp | Conditioning imagery to better receive steganographic encoding |
EP1622380A1 (en) * | 2004-07-30 | 2006-02-01 | Koninklijke KPN N.V. | Method and system for directing interactive TV shows |
CA2576865C (en) * | 2004-08-09 | 2013-06-18 | Nielsen Media Research, Inc. | Methods and apparatus to monitor audio/visual content from various sources |
US7826674B1 (en) | 2004-09-10 | 2010-11-02 | Koplar Interactive Systems International, L.L.C. | Content signal analysis |
US8806533B1 (en) | 2004-10-08 | 2014-08-12 | United Video Properties, Inc. | System and method for using television information codes |
EP2408202B1 (en) * | 2004-11-19 | 2017-05-17 | TiVo Solutions Inc. | Method and apparatus for secure transfer and playback of multimedia content |
US7440398B2 (en) | 2004-11-29 | 2008-10-21 | Honeywell International Inc. | Fault tolerant communication apparatus |
US9282335B2 (en) * | 2005-03-15 | 2016-03-08 | Hewlett-Packard Development Company, L.P. | System and method for coding image frames |
DE102006018238A1 (en) * | 2005-04-20 | 2007-03-29 | Logitech Europe S.A. | Remote control system for home theater system, analyzes log of events stored by remote controller to identify patterns of interest in logged use of remote controller |
US8570586B2 (en) | 2005-05-02 | 2013-10-29 | Digimarc Corporation | Active images through digital watermarking |
US7846028B2 (en) * | 2005-05-19 | 2010-12-07 | Shoot The Moon Products Ii, Llc | Lazer tag advanced |
JP2007006352A (en) * | 2005-06-27 | 2007-01-11 | Nippon Television Network Corp | Control system of external device utilizing data broadcasting, and device and program used for the same |
US8020004B2 (en) | 2005-07-01 | 2011-09-13 | Verance Corporation | Forensic marking using a common customization function |
US8781967B2 (en) * | 2005-07-07 | 2014-07-15 | Verance Corporation | Watermarking in an encrypted domain |
US8074248B2 (en) | 2005-07-26 | 2011-12-06 | Activevideo Networks, Inc. | System and method for providing video content associated with a source image to a television in a communication network |
CN101278568B (en) | 2005-08-16 | 2010-12-15 | 尼尔森(美国)有限公司 | Display device on/off detection methods and apparatus |
US7974435B2 (en) * | 2005-09-16 | 2011-07-05 | Koplar Interactive Systems International Llc | Pattern-based encoding and detection |
US20070213111A1 (en) * | 2005-11-04 | 2007-09-13 | Peter Maclver | DVD games |
US20070153025A1 (en) * | 2005-12-29 | 2007-07-05 | Mitchell Owen R | Method, apparatus, and system for encoding and decoding a signal on a viewable portion of a video |
AU2007221717B2 (en) * | 2006-03-01 | 2010-06-10 | Yasunori Hatabu | Video-linked controller of external target device and video recording medium used therein |
EP2030442A4 (en) * | 2006-05-18 | 2012-05-09 | Nielsen Co Us Llc | Methods and apparatus for cooperator installed meters |
WO2007143755A2 (en) * | 2006-06-09 | 2007-12-13 | Mattel, Inc. | Interactive dvd gaming systems |
US7873982B2 (en) * | 2006-06-22 | 2011-01-18 | Tivo Inc. | Method and apparatus for creating and viewing customized multimedia segments |
US7661121B2 (en) * | 2006-06-22 | 2010-02-09 | Tivo, Inc. | In-band data recognition and synchronization system |
US8261300B2 (en) * | 2006-06-23 | 2012-09-04 | Tivo Inc. | Method and apparatus for advertisement placement in a user dialog on a set-top box |
US20100146139A1 (en) * | 2006-09-29 | 2010-06-10 | Avinity Systems B.V. | Method for streaming parallel user sessions, system and computer software |
WO2008073455A1 (en) * | 2006-12-11 | 2008-06-19 | Koplar Interactive Systems International, L.L.C. | Spatial data encoding and decoding |
US8721460B2 (en) * | 2007-01-04 | 2014-05-13 | Jakks Pacific, Inc. | Toy laser gun and laser target system |
US20080198923A1 (en) * | 2007-01-05 | 2008-08-21 | Gramelspacher Michael S | Content signal modulation and decoding |
US9826197B2 (en) | 2007-01-12 | 2017-11-21 | Activevideo Networks, Inc. | Providing television broadcasts over a managed network and interactive content over an unmanaged network to a client device |
EP2116051A2 (en) * | 2007-01-12 | 2009-11-11 | ActiveVideo Networks, Inc. | Mpeg objects and systems and methods for using mpeg objects |
US20080175313A1 (en) * | 2007-01-24 | 2008-07-24 | Icuiti Corporation | Methods of adaptive encoding and decoding video signals |
GB2451437B (en) * | 2007-07-27 | 2012-11-14 | Hewlett Packard Development Co | Content encoder and decoder and methods of encoding and decoding content |
US8798133B2 (en) * | 2007-11-29 | 2014-08-05 | Koplar Interactive Systems International L.L.C. | Dual channel encoding and detection |
GB2460306B (en) | 2008-05-29 | 2013-02-13 | Intrasonics Sarl | Data embedding system |
US8259938B2 (en) | 2008-06-24 | 2012-09-04 | Verance Corporation | Efficient and secure forensic marking in compressed |
US8180712B2 (en) | 2008-09-30 | 2012-05-15 | The Nielsen Company (Us), Llc | Methods and apparatus for determining whether a media presentation device is in an on state or an off state |
US8793717B2 (en) * | 2008-10-31 | 2014-07-29 | The Nielsen Company (Us), Llc | Probabilistic methods and apparatus to determine the state of a media device |
US8156517B2 (en) * | 2008-12-30 | 2012-04-10 | The Nielsen Company (U.S.), Llc | Methods and apparatus to enforce a power off state of an audience measurement device during shipping |
US8375404B2 (en) | 2008-12-30 | 2013-02-12 | The Nielsen Company (Us), Llc | Methods and apparatus to enforce a power off state of an audience measurement device during shipping |
CN101850187B (en) * | 2009-04-01 | 2012-07-18 | 凌通科技股份有限公司 | Interactive entertainment device, method and system |
US8715083B2 (en) * | 2009-06-18 | 2014-05-06 | Koplar Interactive Systems International, L.L.C. | Methods and systems for processing gaming data |
US8189340B2 (en) | 2009-06-24 | 2012-05-29 | Ivs, Inc. | Mobile digital video recorder |
US9008315B2 (en) | 2012-01-20 | 2015-04-14 | Digimarc Corporation | Shared secret arrangements and optical data transfer |
FR2950540A1 (en) | 2009-09-28 | 2011-04-01 | Electromantik Innovative | METHOD FOR CONTROLLING A DEVICE USING AN IMAGE |
GB2474508B (en) * | 2009-10-16 | 2015-12-09 | Norwell Sa | Audience measurement system |
US8819172B2 (en) | 2010-11-04 | 2014-08-26 | Digimarc Corporation | Smartphone-based methods and systems |
US8775245B2 (en) | 2010-02-11 | 2014-07-08 | News America Marketing Properties, Llc | Secure coupon distribution |
US8508401B1 (en) | 2010-08-31 | 2013-08-13 | Logitech Europe S.A. | Delay fixing for command codes in a remote control system |
US8838977B2 (en) | 2010-09-16 | 2014-09-16 | Verance Corporation | Watermark extraction and content screening in a networked environment |
EP2628306B1 (en) | 2010-10-14 | 2017-11-22 | ActiveVideo Networks, Inc. | Streaming digital video between video devices using a cable television system |
TWM404929U (en) * | 2011-01-03 | 2011-06-01 | Univ Kun Shan | LED luminaries with lighting and communication functions |
EP2695388B1 (en) | 2011-04-07 | 2017-06-07 | ActiveVideo Networks, Inc. | Reduction of latency in video distribution networks using adaptive bit rates |
US8923548B2 (en) | 2011-11-03 | 2014-12-30 | Verance Corporation | Extraction of embedded watermarks from a host content using a plurality of tentative watermarks |
US8533481B2 (en) | 2011-11-03 | 2013-09-10 | Verance Corporation | Extraction of embedded watermarks from a host content based on extrapolation techniques |
US8615104B2 (en) | 2011-11-03 | 2013-12-24 | Verance Corporation | Watermark extraction based on tentative watermarks |
US8682026B2 (en) | 2011-11-03 | 2014-03-25 | Verance Corporation | Efficient extraction of embedded watermarks in the presence of host content distortions |
US8745403B2 (en) | 2011-11-23 | 2014-06-03 | Verance Corporation | Enhanced content management based on watermark extraction records |
US9084312B2 (en) | 2011-12-07 | 2015-07-14 | Comcast Cable Communications, Llc | Dynamic ambient lighting |
US20130198786A1 (en) * | 2011-12-07 | 2013-08-01 | Comcast Cable Communications, LLC. | Immersive Environment User Experience |
US9323902B2 (en) | 2011-12-13 | 2016-04-26 | Verance Corporation | Conditional access using embedded watermarks |
US9547753B2 (en) | 2011-12-13 | 2017-01-17 | Verance Corporation | Coordinated watermarking |
JP2015506158A (en) | 2011-12-19 | 2015-02-26 | ザ ニールセン カンパニー (ユーエス) エルエルシー | Method and apparatus for crediting a media presentation device |
EP2815582B1 (en) | 2012-01-09 | 2019-09-04 | ActiveVideo Networks, Inc. | Rendering of an interactive lean-backward user interface on a television |
EP2805439B1 (en) | 2012-01-20 | 2016-12-28 | Digimarc Corporation | Shared secret arrangements and optical data transfer |
US9692535B2 (en) | 2012-02-20 | 2017-06-27 | The Nielsen Company (Us), Llc | Methods and apparatus for automatic TV on/off detection |
US9800945B2 (en) | 2012-04-03 | 2017-10-24 | Activevideo Networks, Inc. | Class-based intelligent multiplexing over unmanaged networks |
US9123084B2 (en) | 2012-04-12 | 2015-09-01 | Activevideo Networks, Inc. | Graphical application integration with MPEG objects |
US10105616B2 (en) | 2012-05-25 | 2018-10-23 | Mattel, Inc. | IR dongle with speaker for electronic device |
US9372351B1 (en) * | 2012-05-31 | 2016-06-21 | Maxim Integrated Products, Inc. | Circuits for active eyewear |
US8948611B1 (en) * | 2012-05-31 | 2015-02-03 | Maxim Integrated Products, Inc. | I/R receiver with duty cycle synchronized power reduction |
US9571606B2 (en) | 2012-08-31 | 2017-02-14 | Verance Corporation | Social media viewing system |
ES2581554T3 (en) * | 2012-09-10 | 2016-09-06 | Philips Lighting Holding B.V. | Light detection system and method |
US20140075469A1 (en) | 2012-09-13 | 2014-03-13 | Verance Corporation | Content distribution including advertisements |
US8726304B2 (en) | 2012-09-13 | 2014-05-13 | Verance Corporation | Time varying evaluation of multimedia content |
US8869222B2 (en) | 2012-09-13 | 2014-10-21 | Verance Corporation | Second screen content |
TW201424352A (en) * | 2012-12-05 | 2014-06-16 | Wistron Corp | Marketing method and computer system thereof for cloud system |
US8988574B2 (en) | 2012-12-27 | 2015-03-24 | Panasonic Intellectual Property Corporation Of America | Information communication method for obtaining information using bright line image |
SG11201505027UA (en) | 2012-12-27 | 2015-07-30 | Panasonic Ip Corp America | Information communication method |
US10523876B2 (en) | 2012-12-27 | 2019-12-31 | Panasonic Intellectual Property Corporation Of America | Information communication method |
US9608727B2 (en) | 2012-12-27 | 2017-03-28 | Panasonic Intellectual Property Corporation Of America | Switched pixel visible light transmitting method, apparatus and program |
US10303945B2 (en) | 2012-12-27 | 2019-05-28 | Panasonic Intellectual Property Corporation Of America | Display method and display apparatus |
US10951310B2 (en) | 2012-12-27 | 2021-03-16 | Panasonic Intellectual Property Corporation Of America | Communication method, communication device, and transmitter |
US10530486B2 (en) | 2012-12-27 | 2020-01-07 | Panasonic Intellectual Property Corporation Of America | Transmitting method, transmitting apparatus, and program |
JP6328060B2 (en) | 2012-12-27 | 2018-05-23 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカPanasonic Intellectual Property Corporation of America | Display method |
US9087349B2 (en) | 2012-12-27 | 2015-07-21 | Panasonic Intellectual Property Corporation Of America | Information communication method |
US8922666B2 (en) | 2012-12-27 | 2014-12-30 | Panasonic Intellectual Property Corporation Of America | Information communication method |
SG10201502498PA (en) | 2012-12-27 | 2015-05-28 | Panasonic Ip Corp America | Information communication method |
US9608725B2 (en) | 2012-12-27 | 2017-03-28 | Panasonic Intellectual Property Corporation Of America | Information processing program, reception program, and information processing apparatus |
JP5715301B2 (en) * | 2012-12-27 | 2015-05-07 | パナソニック インテレクチュアル プロパティ コーポレーション オブアメリカPanasonic Intellectual Property Corporation of America | Display method and display device |
KR20140086415A (en) * | 2012-12-28 | 2014-07-08 | 삼성전기주식회사 | Device of data communication using video and method of data communication using video |
US9380443B2 (en) | 2013-03-12 | 2016-06-28 | Comcast Cable Communications, Llc | Immersive positioning and paring |
US9262793B2 (en) | 2013-03-14 | 2016-02-16 | Verance Corporation | Transactional video marking system |
WO2014145921A1 (en) | 2013-03-15 | 2014-09-18 | Activevideo Networks, Inc. | A multiple-mode system and method for providing user selectable video content |
EP3005712A1 (en) | 2013-06-06 | 2016-04-13 | ActiveVideo Networks, Inc. | Overlay rendering of user interface onto source video |
US9294785B2 (en) | 2013-06-06 | 2016-03-22 | Activevideo Networks, Inc. | System and method for exploiting scene graph information in construction of an encoded video sequence |
US9219922B2 (en) | 2013-06-06 | 2015-12-22 | Activevideo Networks, Inc. | System and method for exploiting scene graph information in construction of an encoded video sequence |
US9251549B2 (en) | 2013-07-23 | 2016-02-02 | Verance Corporation | Watermark extractor enhancements based on payload ranking |
US9208334B2 (en) | 2013-10-25 | 2015-12-08 | Verance Corporation | Content management using multiple abstraction layers |
US9311639B2 (en) | 2014-02-11 | 2016-04-12 | Digimarc Corporation | Methods, apparatus and arrangements for device to device communication |
KR101731770B1 (en) | 2014-03-13 | 2017-04-28 | 베란스 코오포레이션 | Interactive content acquisition using embedded codes |
US9788029B2 (en) | 2014-04-25 | 2017-10-10 | Activevideo Networks, Inc. | Intelligent multiplexing using class-based, multi-dimensioned decision logic for managed networks |
US9636599B2 (en) | 2014-06-25 | 2017-05-02 | Mattel, Inc. | Smart device controlled toy |
WO2016075948A1 (en) | 2014-11-14 | 2016-05-19 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | Reproduction method, reproduction device and program |
US9924224B2 (en) | 2015-04-03 | 2018-03-20 | The Nielsen Company (Us), Llc | Methods and apparatus to determine a state of a media presentation device |
CN107113058B (en) | 2015-11-06 | 2020-12-18 | 松下电器(美国)知识产权公司 | Method for generating visible light signal, signal generating device, and medium |
WO2017081870A1 (en) | 2015-11-12 | 2017-05-18 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | Display method, program and display device |
EP3393132B1 (en) | 2015-12-17 | 2022-11-02 | Panasonic Intellectual Property Corporation of America | Display method and display device |
CN110114988B (en) | 2016-11-10 | 2021-09-07 | 松下电器(美国)知识产权公司 | Transmission method, transmission device, and recording medium |
Family Cites Families (47)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1209152B (en) * | 1963-09-25 | 1966-01-20 | Edgar F Scholz | Method and device for transmitting and copying a typeface using the facilities of television broadcasting |
US3292489A (en) * | 1964-07-09 | 1966-12-20 | Ibm | Hierarchical search system |
US3493674A (en) * | 1965-05-28 | 1970-02-03 | Rca Corp | Television message system for transmitting auxiliary information during the vertical blanking interval of each television field |
US3737566A (en) * | 1968-01-15 | 1973-06-05 | Sanders Associates Inc | Television coder and decoder |
US3599221A (en) * | 1968-03-18 | 1971-08-10 | Sanders Associates Inc | Recording crt light gun and method |
US3566482A (en) * | 1968-10-24 | 1971-03-02 | Data Plex Systems | Educational device |
US3671668A (en) * | 1968-11-18 | 1972-06-20 | Leonard Reiffel | Teaching system employing a television receiver |
US3728480A (en) * | 1969-03-18 | 1973-04-17 | Sanders Associates Inc | Television gaming and training apparatus |
AU440977B2 (en) * | 1970-03-19 | 1973-09-27 | Sanders Associates, Inc | Television decoder |
US3663937A (en) * | 1970-06-08 | 1972-05-16 | Thiokol Chemical Corp | Intersection ingress-egress automatic electronic traffic monitoring equipment |
US3743767A (en) * | 1971-10-04 | 1973-07-03 | Univ Illinois | Transmitter and receiver for the transmission of digital data over standard television channels |
US3777410A (en) * | 1972-03-01 | 1973-12-11 | Telattach Inc | Interactive display and viewer response apparatus and method |
US3872461A (en) * | 1972-10-26 | 1975-03-18 | Mennen Greatbatch Electronics | Waveform and symbol display system |
US3848082A (en) * | 1973-01-16 | 1974-11-12 | Atlantic Res Corp | System for transmitting and utilizing supplemental data via television systems |
US3900887A (en) * | 1973-01-18 | 1975-08-19 | Nippon Steel Corp | Method of simultaneous multiplex recording of picture and data and of regenerating such record and apparatus therefor |
US3891792A (en) * | 1974-06-25 | 1975-06-24 | Asahi Broadcasting | Television character crawl display method and apparatus |
US3976992A (en) * | 1975-01-03 | 1976-08-24 | Ibm Corporation | Gas display panel with light pen |
US3993861A (en) * | 1975-03-24 | 1976-11-23 | Sanders Associates, Inc. | Digital video modulation and demodulation system |
US4051532A (en) * | 1975-06-19 | 1977-09-27 | Matsushita Electric Company Of America | Auxiliary signal processing circuit for television receivers |
DE2653113C2 (en) * | 1976-11-23 | 1983-01-13 | Loewe Opta Gmbh, 8640 Kronach | TV game switching |
DE2653093B1 (en) * | 1976-11-23 | 1977-09-29 | Loewe Opta Gmbh | TELEVISION GAME SWITCHING WITH A TARGET DETECTOR |
US4186413A (en) * | 1977-11-14 | 1980-01-29 | Sanders Associates, Inc. | Apparatus for receiving encoded messages on the screen of a television receiver and for redisplay thereof on the same receiver screen in a readable format |
US4206557A (en) * | 1978-01-27 | 1980-06-10 | Educational Testing Service | Teaching system employing binary light-sensitive responders |
PL204525A1 (en) * | 1978-02-09 | 1982-07-19 | Os Bad Rozwojowy Przetwornikow | |
US4237486A (en) * | 1978-11-09 | 1980-12-02 | Comsonics, Inc. | Compatible transmission of an encoded signal with a television |
US4329684A (en) * | 1979-01-16 | 1982-05-11 | British Broadcasting Corporation | Apparatus using a light sensing system for sensing time modulated information from a light emitting device |
US4306630A (en) * | 1979-02-01 | 1981-12-22 | Monte Anthony J | Radio controlled miniature target vehicle and radio control accessory for binoculars |
US4218697A (en) * | 1979-05-08 | 1980-08-19 | William Leventer | Digital data transmission arrangement using a standard TV video |
BG30754A1 (en) * | 1980-07-22 | 1982-12-15 | Zhelezov | A method of transmitting digital data through a television signal |
US4484302A (en) * | 1980-11-20 | 1984-11-20 | International Business Machines Corporation | Single screen display system with multiple virtual display having prioritized service programs and dedicated memory stacks |
US4609358A (en) * | 1981-06-26 | 1986-09-02 | Sangster Bruce F | Video training system for simulataneously training a plurality of students |
US4479142A (en) * | 1982-05-17 | 1984-10-23 | M/A-Com Dcc, Inc. | Interface apparatus and method for asynchronous encoding of digital television |
US4608601A (en) * | 1982-07-12 | 1986-08-26 | The Moving Picture Company Inc. | Video response testing apparatus |
US4456925A (en) * | 1982-10-04 | 1984-06-26 | Zenith Radio Corporation | Television/telephone system with automatic dialing |
US4496976A (en) * | 1982-12-27 | 1985-01-29 | Rockwell International Corporation | Reduced memory graphics-to-raster scan converter |
JPS59156696U (en) * | 1983-04-05 | 1984-10-20 | 株式会社 ニツコ− | remote control running toy |
US4638359A (en) * | 1983-05-19 | 1987-01-20 | Westinghouse Electric Corp. | Remote control switching of television sources |
DE3318919C2 (en) * | 1983-05-25 | 1985-03-21 | TeleMetric S.A., Internationale Gesellschaft für Fernsehzuschauerforschung, Zug | Method and apparatus for collecting data on television viewing behavior of television viewers |
JPS6076995U (en) * | 1983-11-02 | 1985-05-29 | 株式会社ニツコー | rechargeable radio controlled toy |
US4579338A (en) * | 1983-11-14 | 1986-04-01 | North American Philips Consumer Electronics Corp. | Video game device with automatic standby mode |
US4613904A (en) * | 1984-03-15 | 1986-09-23 | Control Data Corporation | Television monitoring device |
US4602279A (en) * | 1984-03-21 | 1986-07-22 | Actv, Inc. | Method for providing targeted profile interactive CATV displays |
US4602227A (en) * | 1984-07-30 | 1986-07-22 | Rca Corporation | Coaxial LC phase-shifter for phase-controlled television broadcast switching circuit |
GB8424638D0 (en) * | 1984-09-29 | 1984-11-07 | Firstquad Ltd | Transmission of digital data |
JPS61156405A (en) * | 1984-12-28 | 1986-07-16 | Nintendo Co Ltd | Robot composite system |
US4589138A (en) * | 1985-04-22 | 1986-05-13 | Axlon, Incorporated | Method and apparatus for voice emulation |
JPS62149281A (en) * | 1985-12-23 | 1987-07-03 | Sharp Corp | Information processor |
-
1987
- 1987-10-20 US US07/112,713 patent/US4807031A/en not_active Expired - Lifetime
-
1988
- 1988-06-30 DE DE3886929T patent/DE3886929T2/en not_active Expired - Fee Related
- 1988-06-30 BR BR888807255A patent/BR8807255A/en not_active IP Right Cessation
- 1988-06-30 AU AU20842/88A patent/AU615465B2/en not_active Ceased
- 1988-06-30 JP JP63506121A patent/JP2545456B2/en not_active Expired - Fee Related
- 1988-06-30 RU SU884614686A patent/RU2048709C1/en active
- 1988-06-30 WO PCT/US1988/002192 patent/WO1989004100A1/en active IP Right Grant
- 1988-06-30 KR KR1019890701127A patent/KR970002962B1/en not_active IP Right Cessation
- 1988-06-30 HU HU884569A patent/HU209795B/en not_active IP Right Cessation
- 1988-06-30 EP EP88906481A patent/EP0346402B1/en not_active Expired - Lifetime
- 1988-10-19 ZA ZA887836A patent/ZA887836B/en unknown
- 1988-10-19 PT PT88800A patent/PT88800B/en not_active IP Right Cessation
- 1988-10-19 IE IE316088A patent/IE61641B1/en not_active IP Right Cessation
- 1988-10-19 GR GR900100793A patent/GR1000595B/en unknown
- 1988-10-19 IL IL8808988A patent/IL88089A/en not_active IP Right Cessation
- 1988-10-19 CA CA000580578A patent/CA1323688C/en not_active Expired - Fee Related
- 1988-10-19 GR GR880100707A patent/GR1000173B/en unknown
- 1988-10-20 MX MX13493A patent/MX165159B/en unknown
- 1988-10-20 CN CN88108801A patent/CN1018603B/en not_active Expired
- 1988-10-20 PH PH37705A patent/PH24926A/en unknown
- 1988-10-20 ES ES8803195A patent/ES2009073A6/en not_active Expired
-
1989
- 1989-06-15 OA OA59594A patent/OA09050A/en unknown
- 1989-06-19 NO NO892540A patent/NO176230C/en unknown
- 1989-06-19 FI FI893007A patent/FI93916C/en not_active IP Right Cessation
- 1989-06-20 DK DK303189A patent/DK303189A/en not_active Application Discontinuation
-
1992
- 1992-03-09 PT PT100213A patent/PT100213A/en not_active Application Discontinuation
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