WO1997004531A1 - Low power data receiver combined with audio receiver - Google Patents

Low power data receiver combined with audio receiver Download PDF

Info

Publication number
WO1997004531A1
WO1997004531A1 PCT/US1996/011327 US9611327W WO9704531A1 WO 1997004531 A1 WO1997004531 A1 WO 1997004531A1 US 9611327 W US9611327 W US 9611327W WO 9704531 A1 WO9704531 A1 WO 9704531A1
Authority
WO
WIPO (PCT)
Prior art keywords
data
paging
audio
receiver
power source
Prior art date
Application number
PCT/US1996/011327
Other languages
French (fr)
Inventor
Garold B. Gaskill
Original Assignee
Seiko Communications Systems, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seiko Communications Systems, Inc. filed Critical Seiko Communications Systems, Inc.
Priority to JP50670497A priority Critical patent/JP3917657B2/en
Priority to EP96922660A priority patent/EP0842565A4/en
Priority to AU63460/96A priority patent/AU6346096A/en
Publication of WO1997004531A1 publication Critical patent/WO1997004531A1/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H20/00Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28Arrangements for simultaneous broadcast of plural pieces of information
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/222Personal calling arrangements or devices, i.e. paging systems
    • G08B5/223Personal calling arrangements or devices, i.e. paging systems using wireless transmission
    • G08B5/224Paging receivers with visible signalling details
    • G08B5/228Paging receivers with visible signalling details combined with other devices having a different main function, e.g. watches
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/16Circuits
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates generally to radio signal broadcast apparatus, and
  • the radio station listeners with audio receivers tuned to the particular radio station.
  • the radio station
  • Some FM radio signal broadcasts include a subcarrier signal.
  • Subcarrier signals can, for example, deliver paging data to a population of paging devices each of
  • the paging system thereby uses the
  • the FM broadcast facility receives digital paging messages from a paging system through, for example, a high speed modem coupling the FM broadcast facility to a paging system clearinghouse.
  • the FM broadcast facility includes a subcarrier generator.
  • the subcarrier generator receives the digital paging message information and
  • the subcarrier generator applies this output to an exciter, and subsequent FM signal broadcasting devices to provide paging messages in the subcarrier portion of the transmitted FM radio signal.
  • Radio stations can provide collateral material such as advertising or name and
  • a paging system especially one with a time-division multiplexed and multi-
  • the paging function must reliably receive paging data transmissions according to paging system protocol including frequency agility and time slot targeting.
  • the collateral data function relative to a given radio station may or may not be a paging system broadcast facility.
  • the audio function must follow user tuning to a desired audio station and present the audio signal continuously with clarity unaffected by any paging or collateral data reception functions.
  • a system under the present invention includes an audio receiver tunable to a
  • the pager operates during reception periods to receive paging data, and other times tunes to match tuning of the audio receiver to receive for display collateral data relative to the selected radio station.
  • a radio signal transmission and reception system under the present invention is a radio signal transmission and reception system under the present invention.
  • At least one radio signal transmission station transmits a radio signal including an audio portion and a data portion.
  • the data portion includes digital collateral information descriptive of the audio portion.
  • At least one remote receiving device includes an audio receiver and
  • the audio receiver selectively tunes and presents the audio portion of the radio signal.
  • the data receiver selectively tunes as needed to receive paging data according to the paging system protocol, and at other times tunes in response to tuning on the audio receiver to receive digital collateral information corresponding
  • a radio signal receiving device method of operation under the present invention includes a high power mode and a low power mode.
  • the high power mode operates in response to availability of an intermittently available power source to receive by radio signal transmission audio, paging message, and digital collateral data.
  • the device takes power from the intermittently available power source when in the high power mode.
  • the low power mode operates in response to non-availability of the intermittently available power source to receive by radio signal transmission paging
  • the device takes power from a constantly available relatively lower
  • FIG. 1 illustrates a system according to a preferred embodiment of the present invention including a paging system, plurality of radio stations, and plurality of remote receivers each including a low power data receiver combined with an audio
  • FIG. 2 is a block diagram of one of the radio stations of FIG. 1 including a multiple-
  • FIGS. 3A and 3B are flow charts illustrating operation of the audio source
  • FIG. 4 is a block diagram of one of the remote receivers of FIG. 1.
  • FIG. 5A is a flow chart illustrating a high power mode of operation for the data receiver portion of a remote receiver of FIG. 1.
  • FIG. 5B is a flow chart illustrating a paging data interrupt routine for the data receiver portion of the remote receiver of FIG. 1.
  • a system 10 in accordance with a preferred embodiment of the present invention will be illustrated in the context of a paging system 20 coupled to a plurality of FM radio stations 18, individually 18a-18c.
  • Radio stations 18 each transmit a combined audio and data radio signal 12 to a population of remote receivers 14.
  • receivers 14 are located in a variety of locations, e.g., home audio system 15 or vehicles 16. While a limited number of radio stations 18 and receivers 14 are illustrated in FIG. 1, it will be understood that the present invention may be implemented with any given number of such radio stations and remote receiving devices.
  • Callers 19 connect to system 20 and generate paging requests 21 through a public switch telephone network (PSTN) 22.
  • PSTN public switch telephone network
  • paging system 20 delivers a
  • Each radio station 18 incorporates paging data 24 into a sideband frequency of its signal 12 by use of a subcarrier generator device. Radio stations 18 transmit the audio portion of signal 12 at a given station frequency in conventional fashion and transmit the sideband or data portion at a given
  • remote paging devices activate at certain brief
  • time slots monitor a selected sideband signal, and receive a data packet.
  • Pagers seek paging information by selectively tuning to one of a plurality of radio stations and synchronizing relative to a repeating
  • Each pager targets a given station frequency and time slot for
  • each remote receiver must stand ready to tune to a
  • 4,713,808 shows a paging system including a multi-frequency time-division
  • multiplexed paging system including a clearinghouse and FM radio stations.
  • FM radio station provides in a main audio channel an audio signal and provides in a subcarrier signal paging data directed to a population of remote paging devices.
  • the present invention may be implemented in a variety of radio signal transmission
  • Each of receivers 14 include corresponding receiver decoding circuitry
  • Each radio station 18 also incorporates into the data portion of its signal 12
  • digital collateral data for presentation at receivers 14. While discussed herein generally as textual presentation, it will be understood that digital collateral data
  • audio presentation e.g., song title, song classification, producer, artist, advertiser
  • the invention concems coordinated reception and use of the audio portion, e.g. voice,
  • collateral data e.g., taken from signals 12 and stored or displayed at receivers 14.
  • FIG. 2 illustrates generally one of radio stations 18 as coupled to public switch
  • a stereo generator 200 receives left and right channels of a main audio
  • left and right channels of signal 202 are combined, subtracted, applied to a pilot generator, and subjected to other known procedures to derive a
  • Exciter 210 receives the sum of stereo multiplexed signal 206 and a subcarrier signal 208. Exciter 210 applies its output 220 to an
  • amplifier 222 driving antenna 224 and to transmit the combined voice and data radio
  • a subcarrier generator 214 provides subcarrier signal 208 partially from the stream
  • Paging data 24 represents the normal flow or stream of paging data obtained from paging system 20 and injected as a subcarrier component of radio signal 12.
  • Digital collateral data 218 represents identifying or descriptive data with respect to audio
  • Subcarrier generator 214 incorporates the digital collateral data 218 into the stream of paging data 24 according to paging system 20 broadcast protocol.
  • paging system 20 broadcasts paging message data packets during particular time slots according to a time-division multiplexed protocol, and digital collateral data 218 replaces unused data packets in the stream of paging data 24.
  • a plurality of audio components, or sub-sources, 250 drive an audio mixer 252 producing the audio signal 202 as its output.
  • Components 250 comprise various individual audio sources such as tape machines and CD players storing audio items for programmed presentation by radio station 18.
  • a control 254 applies control commands 256 and 257 to audio components 250 and audio mixer 252, respectively, according to a prearranged play list 260.
  • Play list 260 items specify command information needed to operate a given one of components 250 and further include descriptive or identifying information. Play list 260 thereby dictates operation of control 254 in issuing commands 256 and 257 to components 250 and
  • FIG. 3.- illustrates control 254 operation with respect to audio signal 202 production.
  • FIG. 3 is a flow chart illustrating a "play audio" routine executed by
  • control 254 sends corresponding digital collateral data
  • control 254 sends identifying or descriptive
  • subcarrier generator 214 where a next audio item is selected and played, and corresponding digital collateral data 218 is sent to subcarrier generator 214.
  • FIG. 3B is a flow chart illustrating operation of the subcarrier generator 214.
  • subcarrier generator 214 initializes in block 350 a FILL DATA variable with a
  • digital collateral data 218 has arrived from audio source 204. If no new digital collateral data 218 has arrived then processing advances to block 354, but if new
  • subcarrier generator 214 incorporates the current FILL DATA value into one or more
  • subcarrier generator 214 provides as its output the combined digital collateral data 218, as generated by the radio station 18, and paging data as generated by paging system
  • collateral data 218 has arrived from audio source 204.
  • each radio station 218 presents a series of programmed audio items in the audio portion of its signal 12 while concurrently presenting in the data or
  • each radio station 18 serves
  • a given radio station 18 need not be part of the paging system 20 transmission
  • the radio station 18 would include a subcarrier generator, but need not combine paging data with digital collateral data.
  • the broadcast 12 would then include an audio portion and a data portion including only digital collateral data.
  • FIG. 4 illustrates in simplified block diagram a receiver 14 as contemplated under
  • Receivers 14 each include an audio portion 15 and a data receiver portion 17.
  • Data portion 17 is a low power device corresponding generally
  • the audio portion corresponds generally to a pager under system 20.
  • portions 15 and 17 are modified to
  • the data portion 17 selectively monitors the data portion of one
  • data portion 17 monitors the subcarrier of a specific signal 12 as indicated by the audio portion 15 of receiver 14, i.e. collects collateral data 218
  • An audio receiver 400 receives, via antenna 402, a signal 12 from one of radio
  • Receiver 400 applies the baseband composite signal 412 to a filter
  • Audio signal 416 drives an audio block 420
  • Tuner controls block 426 includes conventional FM radio control buttons and knobs in implementation of the tune signal 408 and volume, balance, and tone control signal 424. Display
  • controls block 428 provides user-buttons for manipulation of a textual display at LCD
  • display block 430 e.g., manipulation of paging message and collateral data textual presentation.
  • Audio portion 15 of each receiver 14 operates generally as a conventional FM radio
  • general purpose controller 410 is configured to control the data portion 17 of receiver 14.
  • a data controller 454 of data portion 17 provides to general
  • paging data 24 and digital collateral data 218 is accomplished by the storage and user-interface resources of audio portion 15 of receiver 14. This arrangement avoids duplication of display and storage resources in the receiver 14. As may be
  • data portion 17 could be provided with its own storage and
  • data portion 17 does include a small local storage block 455 for storing
  • Data receiver 450 monitors, via antenna 451 , the subcarrier or data portion of a
  • a filter 416 couples the data receiver 450 output 418 to a data
  • Decoder block 456 reacts to paging system 20 protocol to extract therefrom a sequence of data packets.
  • controller 454 monitors
  • Controller 454 provides selected data packets 432 to controller 410. Controller 454
  • Controller 454 determines the current tuning of
  • LCD display block 430 allows controller 410 to present textually the content of data
  • block 431 allows controller 410 to save a given number of data packets 432.
  • controller 410 interacts with blocks 428, 430, and 431 according to an established user-interface to implement selected storage and textual display of paging data 24
  • Each receiver 14 has two power sources, i.e., a high power source 470 and a low power source 472.
  • High power source 470 e.g., a vehicle 16 power system, provides power for the audio portion 15 of each receiver 14, but may not always be
  • Low power source 472 e.g., a small battery such as a watch battery,
  • Switch 474 receives energy from high power source
  • Switch 474 applies to data portion 17 the high power source 470 when available and otherwise applies low power source 472.
  • data portion 17 monitors the high power
  • data portion 17 constantly collects data packets from a radio station 18 sideband frequency
  • Data portion 17 thereby reacts to availability of power and performs the additional
  • receiver 14 could be incorporated into an AC-powered
  • high power source 470 is only be available when the device is switched-on or plugged into a wall receptacle.
  • low power source 472 is always available for operation of data portion 17 to
  • FIGS. 5A and 5B are flow charts illustrating programming for data controller 454.
  • FIG. 5A shows a high power mode of operation for controller 454
  • FIG. 5B shows operation relative to receiving of paging data 24, in particular a seek paging data interrupt routine executed with reference to the repeating time frame of system 20 protocol to activate and monitor a selected signal
  • FIG. 5B occurs regardless of high power source 470 availability, there being low
  • controller 454 reacts to the availability of high power source 470 by first enabling in block 500 the interrupt processing, i.e. paging message targeting and collection, of FIG. 5B. Continuing to block 502, controller 454 references its tuned audio frequency 435 input and tunes data receiver 450 to match the current tuning
  • controller 454 receives a data packet according
  • controller 454 interrogates the content of the received data packet to identify representation of the digital collateral data 218 therein.
  • data packets carrying digital collateral 218 include an identification field
  • controller 454 sends the just-received digital collateral
  • controller 454 determines if the user has switched to a different station 18 by again referencing its tuned audio frequency 435 input. If audio receiver 400 has been tuned by the user to a new frequency then processing returns to tuning block 502, but otherwise retums to receiving block 504.
  • FIG. 5B illustrates the paging data interrupt routine executed by data portion 17 of
  • processing begins in block 550 where controller 454 activates data receiver 450 and
  • Tuning in block 550 corresponds to a
  • System 20 broadcasts information redundantly on radio stations 18, with a given time offset between station 18 time frames. In this manner, a pager switches frequencies, i.e., tunes to a different station 18 and synchronizes to its offset time
  • each pager seeks paging data by selecting a particular radio station
  • controller 454 receives and decodes a data packet.
  • controller 454 compares its address with an address field of the decoded packet, i.e., determines whether the data packet is addressed to this
  • Processing of FIG. 5B then exits from block 562. If, however, the decoded data packet is addressed to this particular receiver 14,
  • controller 454 stores the decoded data packet in local storage block 455.
  • local storage block 455 is of sufficient size to hold a desired number of decoded
  • controller 454 sends stored data packets to general
  • the data portion may be incorporated into existing device design by appropriate interface coupling.
  • the data portion may be incorporated
  • the device advantageously collects all digital collateral information on a given radio station.
  • second low power source remains constantly available to serve the higher priority paging functions. In this manner, a receiver 14 presently unused remains available to collect paging data.

Abstract

A combined audio receiver (400) and data receiver (450) act in cooperation to serve audio presentation, digital collateral data presentation and paging functions. The data receiver (450) activates intermittently according to a time-division multiplexed broadcast protocol to receive paging data during brief time slots. At other times, the data receiver (450) tunes to a frequency matching that of the audio receiver (400) to receive digital collateral data descriptive of the audio presentation.

Description

LOW POWER DATA RECEIVER COMBINED WITH AUDIO RECEIVER
BACKGROUND OF THE INVENTION
The present invention relates generally to radio signal broadcast apparatus, and
particularly to combined paging, audio, and collateral digital data signal apparatus
and method.
Records, songs or audio tracks played over conventional radio stations are heard by
listeners with audio receivers tuned to the particular radio station. The radio station
operator or disc jockey announces identifying or descriptive information verbally either with respect to each individual audio track or for a sequence of audio tracks.
Listeners traditionally have opportunity to only hear the identifying or descriptive
information.
Some FM radio signal broadcasts include a subcarrier signal. Subcarrier signals can, for example, deliver paging data to a population of paging devices each of
which monitor one or more subcarrier signals. The paging system thereby uses the
existing FM signal broadcast facilities, i.e., existing radio stations. The FM broadcast facility receives digital paging messages from a paging system through, for example, a high speed modem coupling the FM broadcast facility to a paging system clearinghouse. The FM broadcast facility includes a subcarrier generator.
The subcarrier generator receives the digital paging message information and
incorporates this paging message information into its output as a subcarrier signal.
The subcarrier generator applies this output to an exciter, and subsequent FM signal broadcasting devices to provide paging messages in the subcarrier portion of the transmitted FM radio signal.
Radio stations can provide collateral material such as advertising or name and
author of a record or song being played. For example, the name and author of a
given song may appear on a radio display during song presentation. For example, see co-pending U.S. Patent Application Serial Number 08\365,859, filed 12/29/94, entitled TRANSMITTING AND DISPLAYING ON A RECEIVER INFORMATION
DESCRIBING BROADCAST PROGRAMS and assigned in common to the assignee of the present invention.
A paging system, especially one with a time-division multiplexed and multi-
frequency protocol, introduces difficulty when incorporating also audio and collateral data functions. The paging function must reliably receive paging data transmissions according to paging system protocol including frequency agility and time slot targeting. The collateral data function relative to a given radio station may or may not be a paging system broadcast facility. The audio function must follow user tuning to a desired audio station and present the audio signal continuously with clarity unaffected by any paging or collateral data reception functions.
It would be desirable to provide, therefore, a coordinated use of paging system information and collateral data in the context of an integrated audio and data receiver. The subject matter of the present invention provides such coordinated use
of audio, paging, and collateral data. SUMMARY OF THE INVENTION A system under the present invention includes an audio receiver tunable to a
selected radio station and a low power consuming pager in combination. The pager operates during reception periods to receive paging data, and other times tunes to match tuning of the audio receiver to receive for display collateral data relative to the selected radio station.
A radio signal transmission and reception system under the present invention
includes a paging system generating and making available paging data by radio signal transmission according to a paging system protocol. At least one radio signal transmission station transmits a radio signal including an audio portion and a data portion. The data portion includes digital collateral information descriptive of the audio portion. At least one remote receiving device includes an audio receiver and
a data receiver. The audio receiver selectively tunes and presents the audio portion of the radio signal. The data receiver selectively tunes as needed to receive paging data according to the paging system protocol, and at other times tunes in response to tuning on the audio receiver to receive digital collateral information corresponding
to the audio signal.
A radio signal receiving device method of operation under the present invention includes a high power mode and a low power mode. The high power mode operates in response to availability of an intermittently available power source to receive by radio signal transmission audio, paging message, and digital collateral data. The device takes power from the intermittently available power source when in the high power mode. The low power mode operates in response to non-availability of the intermittently available power source to receive by radio signal transmission paging
messages. The device takes power from a constantly available relatively lower
power source when in the low power mode.
The subject matter of the present invention is particularly pointed out and distinctly claimed in the concluding portion of this specification. However, both the
organization and method of operation of the invention, together with further
advantages and objects thereof, may best be understood by reference to the
following description taken with the accompanying drawings wherein like reference
characters refer to like elements.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS FIG. 1 illustrates a system according to a preferred embodiment of the present invention including a paging system, plurality of radio stations, and plurality of remote receivers each including a low power data receiver combined with an audio
receiver.
FIG. 2 is a block diagram of one of the radio stations of FIG. 1 including a multiple-
component audio source and a subcarrier generator to produce a combined audio
and data transmission.
FIGS. 3A and 3B are flow charts illustrating operation of the audio source and
subcarrier generator, respectively, of FIG. 2. FIG. 4 is a block diagram of one of the remote receivers of FIG. 1.
FIG. 5A is a flow chart illustrating a high power mode of operation for the data receiver portion of a remote receiver of FIG. 1.
FIG. 5B is a flow chart illustrating a paging data interrupt routine for the data receiver portion of the remote receiver of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT With reference to FIG. 1, a system 10 in accordance with a preferred embodiment of the present invention will be illustrated in the context of a paging system 20 coupled to a plurality of FM radio stations 18, individually 18a-18c. Radio stations 18 each transmit a combined audio and data radio signal 12 to a population of remote receivers 14. In the described embodiment, receivers 14 are located in a variety of locations, e.g., home audio system 15 or vehicles 16. While a limited number of radio stations 18 and receivers 14 are illustrated in FIG. 1, it will be understood that the present invention may be implemented with any given number of such radio stations and remote receiving devices.
Callers 19 connect to system 20 and generate paging requests 21 through a public switch telephone network (PSTN) 22. In response, paging system 20 delivers a
stream of paging data 24 to radio stations 18 via PSTN 22 according to a time- division multiplexed protocol. Each radio station 18 incorporates paging data 24 into a sideband frequency of its signal 12 by use of a subcarrier generator device. Radio stations 18 transmit the audio portion of signal 12 at a given station frequency in conventional fashion and transmit the sideband or data portion at a given
frequency offset relative to the station frequency.
Under paging system 20 protocol, remote paging devices activate at certain brief
time slots, monitor a selected sideband signal, and receive a data packet.
Addressing schemes associate a given pager with certain time slots and also allow
certain pagers to share time slots. Pagers seek paging information by selectively tuning to one of a plurality of radio stations and synchronizing relative to a repeating
frame of time slots. Each pager targets a given station frequency and time slot for
paging message reception, but otherwise remains dormant during virtually all of the
repeating time frame. As paging messages are received, the pagers store and make available for display paging messages addressed thereto. Thus, to reliably receive paging messages, each remote receiver must stand ready to tune to a
selected frequency during a selected time slot and receive a data packet.
For a more comprehensive description of a paging system 20, U.S. Patent Number
4,713,808 shows a paging system including a multi-frequency time-division
multiplexed paging system including a clearinghouse and FM radio stations. Each
FM radio station provides in a main audio channel an audio signal and provides in a subcarrier signal paging data directed to a population of remote paging devices.
The present invention may be implemented in a variety of radio signal transmission
systems, however, the present invention will be illustrated by reference to paging
system 20. Each of receivers 14 include corresponding receiver decoding circuitry
for accessing and decoding the paging system broadcast and protocol. Each radio station 18 also incorporates into the data portion of its signal 12
information descriptive of the current audio portion presentation, i.e., incorporates
digital collateral data, for presentation at receivers 14. While discussed herein generally as textual presentation, it will be understood that digital collateral data
may also represent graphic images and may also be converted, e.g. text-to-speech
conversion, for audible presentation. As used herein, the term "collateral data" shall
refer to a variety of identifying or descriptive information with respect to a given
audio presentation, e.g., song title, song classification, producer, artist, advertiser
name, radio station identification, and the like. The subject matter of the present
invention concems coordinated reception and use of the audio portion, e.g. voice,
music, and announcement presentation; of the data portion, e.g. textual display of
collateral data; and of paging messages, e.g., taken from signals 12 and stored or displayed at receivers 14.
FIG. 2 illustrates generally one of radio stations 18 as coupled to public switch
telephone network 22 and providing a combined voice and data radio signal 12. In FIG. 2, a stereo generator 200 receives left and right channels of a main audio
signal 202 from a multiple-component programmable audio source 204. In stereo
generator 200, left and right channels of signal 202 are combined, subtracted, applied to a pilot generator, and subjected to other known procedures to derive a
stereo multiplexed signal 206. Exciter 210 receives the sum of stereo multiplexed signal 206 and a subcarrier signal 208. Exciter 210 applies its output 220 to an
amplifier 222 driving antenna 224 and to transmit the combined voice and data radio
signal 12 to receivers 14. A subcarrier generator 214 provides subcarrier signal 208 partially from the stream
of paging data 24, obtained by way of modem 216 coupled to telephone network 22,
and partially from digital collateral data 218 obtained from audio source 204. Paging data 24 represents the normal flow or stream of paging data obtained from paging system 20 and injected as a subcarrier component of radio signal 12. Digital collateral data 218 represents identifying or descriptive data with respect to audio
signal 202. Subcarrier generator 214 incorporates the digital collateral data 218 into the stream of paging data 24 according to paging system 20 broadcast protocol. In the illustrated embodiment, paging system 20 broadcasts paging message data packets during particular time slots according to a time-division multiplexed protocol, and digital collateral data 218 replaces unused data packets in the stream of paging data 24.
A plurality of audio components, or sub-sources, 250 drive an audio mixer 252 producing the audio signal 202 as its output. Components 250 comprise various individual audio sources such as tape machines and CD players storing audio items for programmed presentation by radio station 18. A control 254 applies control commands 256 and 257 to audio components 250 and audio mixer 252, respectively, according to a prearranged play list 260. Play list 260 items specify command information needed to operate a given one of components 250 and further include descriptive or identifying information. Play list 260 thereby dictates operation of control 254 in issuing commands 256 and 257 to components 250 and
audio mixer 252, and also serves as a source for the digital collateral data 218. FIG. 3.- illustrates control 254 operation with respect to audio signal 202 production.
In particular, FIG. 3 is a flow chart illustrating a "play audio" routine executed by
control 254 of each radio station 18. Control 254 first selects a next item from play
list 260 in block 300 and then in block 302 starts play of the selected item. The selected item thereby appears in the audio portion of signal 12 for that radio station
18. Continuing to block 304, control 254 sends corresponding digital collateral data
218 to subcarrier 214. In other words, control 254 sends identifying or descriptive
information relative to the audio item just taken from the play list 260 and playing on one of components 250. Programming then loops at decision block 306 until the current audio item completes play. Once complete, processing returns to block 300
where a next audio item is selected and played, and corresponding digital collateral data 218 is sent to subcarrier generator 214.
FIG. 3B is a flow chart illustrating operation of the subcarrier generator 214. In FIG.
3B, subcarrier generator 214 initializes in block 350 a FILL DATA variable with a
null value and proceeds to decision block 302 where it determines whether new
digital collateral data 218 has arrived from audio source 204. If no new digital collateral data 218 has arrived then processing advances to block 354, but if new
digital collateral data 218 has arrived subcarrier generator 214 sets the FILL DATA
variable to equal the value of the new digital collateral data 218. In block 356
subcarrier generator 214 incorporates the current FILL DATA value into one or more
unused data packets of the stream of paging data 24, and thereby fills unused time
slots of the paging system 20 protocol with digital collateral data 218 corresponding to the current audio presentation for this radio station 18. In block 357, subcarrier generator 214 provides as its output the combined digital collateral data 218, as generated by the radio station 18, and paging data as generated by paging system
20. Processing then returns to decision block 352 to determine whether new digital
collateral data 218 has arrived from audio source 204.
In this manner, each radio station 218 presents a series of programmed audio items in the audio portion of its signal 12 while concurrently presenting in the data or
subcarrier portion of its signal 12 combined digital collateral data 218 and paging
data 24. As illustrated in this particular embodiment, each radio station 18 serves
as a paging system 20 transmission facility. Under the present invention, however, a given radio station 18 need not be part of the paging system 20 transmission
facility. In such case, the radio station 18 would include a subcarrier generator, but need not combine paging data with digital collateral data. The broadcast 12 would then include an audio portion and a data portion including only digital collateral data.
FIG. 4 illustrates in simplified block diagram a receiver 14 as contemplated under
the present invention. Receivers 14 each include an audio portion 15 and a data receiver portion 17. Data portion 17 is a low power device corresponding generally
to a pager under system 20. The audio portion corresponds generally to a
conventional FM audio receiver. Each of portions 15 and 17 are modified to
establish interaction therebetween and operation under the present invention as
described herein. The data portion 17 selectively monitors the data portion of one
signals 12 as necessary to satisfy the desired paging function according to system
20 protocol. Further, when not seeking paging messages and when sufficient power is available, data portion 17 monitors the subcarrier of a specific signal 12 as indicated by the audio portion 15 of receiver 14, i.e. collects collateral data 218
corresponding to the user-selected radio station 18.
An audio receiver 400 receives, via antenna 402, a signal 12 from one of radio
stations 18 as established by a tune signal 408 originating from a general purpose
controller 410. Receiver 400 applies the baseband composite signal 412 to a filter
414 to obtain an audio signal 416. Audio signal 416 drives an audio block 420
coupled to a pair of speakers 422 and operating in response to a volume, balance,
and tone control signal 424 originating from controller 410. Tuner controls block 426 includes conventional FM radio control buttons and knobs in implementation of the tune signal 408 and volume, balance, and tone control signal 424. Display
controls block 428 provides user-buttons for manipulation of a textual display at LCD
display block 430, e.g., manipulation of paging message and collateral data textual presentation.
Audio portion 15 of each receiver 14 operates generally as a conventional FM radio
receiver tunable to a given FM station for presentation of an audio signal at
speakers 422. Modification relative to conventional operation includes and interface
to the data portion 17 of receiver 14. In particular, general purpose controller 410
provides to data controller 454 a tuned audio frequency 435 representing the station
18 to which audio receiver 400 is currently tuned, i.e., a representation of tune
signal 408. Further, a data controller 454 of data portion 17 provides to general
purpose controller 410 decoded data 432 whereby storage and presentation of
paging data 24 and digital collateral data 218 is accomplished by the storage and user-interface resources of audio portion 15 of receiver 14. This arrangement avoids duplication of display and storage resources in the receiver 14. As may be
appreciated, however, data portion 17 could be provided with its own storage and
display resources. Such arrangement would further minimize the interface between
data portion 17 and audio portion 17 of receiver 14, and minimize modifications
relative to conventional audio receiver design. As will be discussed more fully hereafter, data portion 17 does include a small local storage block 455 for storing
selected data packets when general purpose controller 410 is unavailable, i.e., not
operating for lack of high power source 470 availability.
Data receiver 450 monitors, via antenna 451 , the subcarrier or data portion of a
selected station 18 signal 12 according to a tune signal 452 provided by a data
controller 454. A filter 416 couples the data receiver 450 output 418 to a data
decoder block 456. Decoder block 456 reacts to paging system 20 protocol to extract therefrom a sequence of data packets. Receiver 14, according to paging system 20 operation, activates only during certain targeted and brief, i.e., 13
millisecond, time slots to receive paging messages. Such time-division multiplexed
protocol conserves battery power. As illustrated herein, however, when sufficient
power is available, e.g. vehicle 16 ignition power present, controller 454 monitors
constantly a sequence of data packets derived from the data portion 418 taken from radio signal 12.
Controller 454 provides selected data packets 432 to controller 410. Controller 454
evaluates received data packets in implementation of a given paging system 20
addressing scheme, i.e., keeping those data packets 432 addressed specifically to a given receiver 14, and also in implementation of the present invention keeping those
data packets 432 carrying representation of digital collateral data 218 identifying and describing a current audio presentation in the radio signal 12 to which the audio
receiver 400 is currently tuned. Controller 454 determines the current tuning of
audio receiver 400 by reference to the tuned audio frequency 435 provided by
general purposed controller 410.
LCD display block 430 allows controller 410 to present textually the content of data
packets 432 in response to user manipulation of display controls block 428. Storage
block 431 allows controller 410 to save a given number of data packets 432. Thus, controller 410 interacts with blocks 428, 430, and 431 according to an established user-interface to implement selected storage and textual display of paging data 24
addressed to receiver 14 and digital collateral data 218 collected by receiver 14.
Each receiver 14 has two power sources, i.e., a high power source 470 and a low power source 472. High power source 470, e.g., a vehicle 16 power system, provides power for the audio portion 15 of each receiver 14, but may not always be
available. Low power source 472, e.g., a small battery such as a watch battery,
remains always available to provide power for data portion 17 when high power
source 470 is not available. Switch 474 receives energy from high power source
470 and from low power source 472. Switch 474 applies to data portion 17 the high power source 470 when available and otherwise applies low power source 472. A
high power available signal 476 drives switch 474 to apply the selected power
source to data portion 17. Further, data portion 17 monitors the high power
available signal 476 to determine the current power mode. Generally, when operating from low power source 472, data portion 17 operates
according to its normal paging function, i.e., activating at certain targeted time slots
and monitoring certain stations 18 to receive data packets bearing paging messages
addressed to that particular paging receiver. When high power source 470 is available and when higher priority paging functions are dormant, data portion 17 constantly collects data packets from a radio station 18 sideband frequency
corresponding to the radio station 18 to which audio receiver 400 is currently tuned.
Data portion 17 thereby reacts to availability of power and performs the additional
function of digital collateral data 418 reception without excessively diminishing the
low power source 472 and without interrupting normal paging message reception functions.
While a particular power source arrangement has been illustrated in FIG. 4, it will be appreciated that the present invention may be applied to a variety of power source arrangements. For example, receiver 14 could be incorporated into an AC-powered
device, e.g., home audio system 15. In such case, high power source 470 is only be available when the device is switched-on or plugged into a wall receptacle. At other
times, low power source 472 is always available for operation of data portion 17 to
reliably execute the higher priority paging function.
FIGS. 5A and 5B are flow charts illustrating programming for data controller 454. In
particular, FIG. 5A shows a high power mode of operation for controller 454
executed when sufficient power is available to allow constant monitoring of digital
collateral data 218. FIG. 5B shows operation relative to receiving of paging data 24, in particular a seek paging data interrupt routine executed with reference to the repeating time frame of system 20 protocol to activate and monitor a selected signal
12 sideband transmission during a targeted time slot. The interrupt procedure of
FIG. 5B occurs regardless of high power source 470 availability, there being low
power source 472 always available for operation of data portion 17. When high
power source 470 is available, however, processing of FIG. 5A occurs with the interrupt routine of FIG. 5B enabled to allow collection of paging data 24 as a higher
priority function relative to collection of digital collateral data 218.
In FIG. 5A, controller 454 reacts to the availability of high power source 470 by first enabling in block 500 the interrupt processing, i.e. paging message targeting and collection, of FIG. 5B. Continuing to block 502, controller 454 references its tuned audio frequency 435 input and tunes data receiver 450 to match the current tuning
of audio receiver 400. In block 504 controller 454 receives a data packet according
to paging system 20 protocol. Processing then advances to decision block 506
where controller 454 interrogates the content of the received data packet to identify representation of the digital collateral data 218 therein. As may be appreciated, data packets carrying digital collateral 218 include an identification field
differentiating digital collateral data 218 from paging messages.
If the received data packet carries digital collateral data 218, then processing advances to block 510 where controller 454 sends the just-received digital collateral
data 218 to controller 410 as decoded data 432 for textual presentation at display
block 430. Otherwise, processing advances to decision block 512. In decision block 512, controller 454 determines if the user has switched to a different station 18 by again referencing its tuned audio frequency 435 input. If audio receiver 400 has been tuned by the user to a new frequency then processing returns to tuning block 502, but otherwise retums to receiving block 504.
FIG. 5B illustrates the paging data interrupt routine executed by data portion 17 of
receiver 14 regardless of availability of high power source 470. In FIG. 5B,
processing begins in block 550 where controller 454 activates data receiver 450 and
data decoder 456 and also tunes data receiver 450 by application of tune signal
452. Important to note, activation, i.e., initiation of the FIG. 5B interrupt process,
corresponds to a selected or targeted time slot of system 20 broadcast protocol
associated with this particular receiver 14. Tuning in block 550 corresponds to a
selected one of radio stations 18 targeted for collecting specific paging data. System 20 broadcasts information redundantly on radio stations 18, with a given time offset between station 18 time frames. In this manner, a pager switches frequencies, i.e., tunes to a different station 18 and synchronizes to its offset time
frame. Thus, each pager seeks paging data by selecting a particular radio station
18 and time slot relative to that radio station 18 time frame.
Continuing to block 552, controller 454 receives and decodes a data packet. In
decision block 554, controller 454 compares its address with an address field of the decoded packet, i.e., determines whether the data packet is addressed to this
particular receiver. If the address fails to match, processing branches from decision
block 554 to block 562 where controller 454 sets its interrupt for a next targeted time
slot, i.e., a next occurrence for the paging data interrupt routine of FIG. 5B.
Processing of FIG. 5B then exits from block 562. If, however, the decoded data packet is addressed to this particular receiver 14,
then processing branches from decision block 554 to block 556 where controller 454 stores the decoded data packet in local storage block 455. As may be appreciated,
local storage block 455 is of sufficient size to hold a desired number of decoded
data packets, i.e., capable of storing a given number of paging messages.
Following storage, processing advances to decision block 558 where controller 454
determines availability of high power source 470, i.e., references high power
command 476. If high power source 470 is currently being used, then processing
branches to block 560 where controller 454 sends stored data packets to general
purpose controller 410 and clears from local storage block 455 the stored data
packets. Processing then advances from block 560 to block 562 and continues as
described above. If high power source 470 is not being used, i.e., general purpose controller 410 not available to accept decoded data packets, then processing branches from decision block 558 directly to block 562.
Thus, a low power data receiver combined with audio receiver has been shown and described. The data portion may be incorporated into existing device design by appropriate interface coupling. For example, the data portion may be incorporated
into vehicle radios, home audio systems, personal computers, and generally into
any existing product form as a mechanism to manage both paging functions and also digital collateral data. By providing access to a high power source, the device advantageously collects all digital collateral information on a given radio station. A
second low power source remains constantly available to serve the higher priority paging functions. In this manner, a receiver 14 presently unused remains available to collect paging data.
It will be appreciated that the present invention is not restricted to the particular
embodiment that has been described and illustrated, and that variations may be
made therein without departing from the scope of the invention as found in the appended claims and equivalents thereof.

Claims

CLAIMS What is claimed is:
1. A system comprising:
an audio receiver tunable to a selected radio station; and
a low power consuming pager having paging signal reception periods during which paging data is received, the pager being responsive at time other than said
paging signal reception periods to tuning of said audio receiver to receive collateral
data relative to said selected radio station.
2. A system according to claim 1 wherein said pager responds to availability of an intermittently available power source by receiving power therefrom
and receiving said digital collateral data.
3. A radio signal transmission and reception system comprising:
a paging system generating and making available paging data by radio signal
transmission according to a paging system protocol;
at least one radio signal transmission station transmitting a radio signal including an audio portion and a data portion, the data portion including digital collateral information descriptive of said audio portion; and
at least one remote receiving device including an audio receiver and a data
receiver, said audio receiver being selectively tunable and presenting said audio
portion of said radio signal, said data receiver being selectively tunable to receive said paging data according to said system protocol and also tuned in response to tuning of said audio receiver to receive said digital collateral information.
4. A system according to claim 3 wherein said at least one receiver operates selectively in a first mode and a second mode, said first mode being
invoked and maintained according to said paging system protocol and causing
reception of said paging data, said second mode being invoked in response to
availability of a given power source and causing reception of said digital collateral data and said paging data.
5. A system according to claim 3 wherein said radio station also receives
from said paging system said paging data and transmits said paging data in combination with said digital collateral data.
6. A system according to claim 3 wherein said paging data is transmitted by said radio signal.
7. A system according to claim 6 wherein said radio station combines said digital collateral data and said paging data for transmission a sideband frequency relative to its audio portion transmission frequency.
8. A system according to claim 3 wherein said at least one remote
receiver includes a first power source and a second power source, said first power
source being maintained constantly, said second power source being maintained
intermittently, said at least one receiver selectively using said second power source
when available and receiving said digital collateral data when using said second
power source.
9. A radio signal receiving device method of operation, said method including the steps: a high power mode invoked in response to availability of an intermittently available power source to receive by radio signal transmission audio, paging message, and digital collateral data, said device taking power from said intermittently available power source when in said high power mode; and a low power mode invoked in response to non-availability of said intermittently available power source to receive by radio signal transmission paging
messages, said device taking power from a constantly available power source when
in said low power mode.
PCT/US1996/011327 1995-07-14 1996-07-02 Low power data receiver combined with audio receiver WO1997004531A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP50670497A JP3917657B2 (en) 1995-07-14 1996-07-02 Low power data receiver combined with audio receiver
EP96922660A EP0842565A4 (en) 1995-07-14 1996-07-02 Low power data receiver combined with audio receiver
AU63460/96A AU6346096A (en) 1995-07-14 1996-07-02 Low power data receiver combined with audio receiver

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/502,807 US5774798A (en) 1995-07-14 1995-07-14 Low power data receiver combined with audio receiver
US08/502,807 1995-07-14

Publications (1)

Publication Number Publication Date
WO1997004531A1 true WO1997004531A1 (en) 1997-02-06

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EP (1) EP0842565A4 (en)
JP (1) JP3917657B2 (en)
AU (1) AU6346096A (en)
CA (1) CA2221742A1 (en)
WO (1) WO1997004531A1 (en)

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Also Published As

Publication number Publication date
CA2221742A1 (en) 1997-02-06
US5774798A (en) 1998-06-30
EP0842565A4 (en) 2000-09-13
JPH11509393A (en) 1999-08-17
AU6346096A (en) 1997-02-18
EP0842565A1 (en) 1998-05-20
JP3917657B2 (en) 2007-05-23

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