WO2001073719A2 - Infrared communications device - Google Patents
Infrared communications device Download PDFInfo
- Publication number
- WO2001073719A2 WO2001073719A2 PCT/AT2001/000087 AT0100087W WO0173719A2 WO 2001073719 A2 WO2001073719 A2 WO 2001073719A2 AT 0100087 W AT0100087 W AT 0100087W WO 0173719 A2 WO0173719 A2 WO 0173719A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- communication device
- information
- infrared communication
- pulse
- base
- Prior art date
Links
- 238000004891 communication Methods 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 230000033001 locomotion Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 5
- 230000001960 triggered effect Effects 0.000 claims description 3
- 241000699666 Mus <mouse, genus> Species 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000012790 confirmation Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 2
- 241000699670 Mus sp. Species 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
- G08C23/04—Non-electrical signal transmission systems, e.g. optical systems using light waves, e.g. infrared
Definitions
- the invention relates to an infrared communication device with a base device that communicates bidirectionally with a variety of control devices.
- Such a communication device is known from WO 97/23853.
- Such a communication device is used, for example, for computers, set-top boxes, digital broadcasting systems, such as, for example, the dBox, audio systems, video systems, game consoles, house bus systems and other infrared applications, which use standard infrared remote controls, infrared keyboards , Infrared mice, infrared game pads and / or other infrared controls with a bidirectional IR interface can be controlled and operated. For example, several people in a room, each with an operating device, can run a computer game together. All operating devices communicate bidirectionally with the one basic device, which is connected to the computer via a known interface, such as a serial or a parallel interface.
- the base device is connected to a large number of devices to be controlled remotely, such as a computer, a CD player, a video recorder and other devices which can be controlled remotely.
- each operating device is assigned an individual address in one embodiment, by means of which the basic device can address the individual operating device and can also identify its signals.
- each operating device is assigned its own communication channel, for example by frequency multiplexing, in which a different frequency is assigned to each channel.
- the base device sends its message intended for a selected control device and then waits for a confirmation signal from this control device, whereupon the next control device is addressed in the same way.
- WO 98/02995 describes a transmission method between a plurality of stations, e.g. a satellite and several ground stations, the transmission channel being divided into successive time windows of a predetermined length, each consisting of two parts, namely a data transmission part and a smaller channel request part.
- a channel occupancy signal is output in the channel request part, which takes precedence for a new message in the event of a collision between the channel occupancy signal and a channel request signal.
- the object of the invention is to provide a communication device which enables error-free and collision-free communication between a large number of operating devices and a basic device with a very simple transmission protocol. This object is achieved by the features specified in claim 1. Advantageous refinements and developments of the invention can be found in the subclaims.
- the basic principle of the invention is that the base unit sends out a start pulse that is received by all (reachable) control units and that each operating device is assigned a time window based on the start pulse, within which it sends its information to the base device.
- a cycle thus consists of a start pulse and a number of time windows that correspond to the number of controls. A new cycle then starts again with a start pulse.
- the length of a cycle is variable and depends on the number of controls. It is set when the base station is configured. Depending on the type of individual operating device, the time length of the individual time windows can also be different, which can be determined when configuring the base station.
- a start pulse is triggered at the request of an operating device. This reduces the power consumption of the base station, since a cycle is only triggered when at least one operating device has to send a message to the base device.
- the infrared communication between the base and control device takes place by means of a two-phase modulated carrier frequency, which ensures a high level of transmission security.
- This also gives the IR range a long range, which gives users of the control units greater freedom of movement.
- Another advantage is the low level of interference from other sources, such as light, electromagnetic interference, etc., since the two-phase modulated carrier frequency can be easily distinguished from other sources of interference and very low reception levels are sufficient. Therefore, the individual operating devices do not have to be aligned with the base device, since reflections on objects or walls of the room are sufficient to exchange a distinguishable signal. According to a development of the invention, the transmission power of the individual control devices is automatically minimized.
- At least one bit or pulse or also a burst with a step-wise reduced transmission power is emitted during the transmission of the infrared signal from the operating device to the basic device. If this bit or pulse is recognized by the base unit, it sends an acknowledgment signal to the control unit, which then emits with the reduced transmission power for the next sequence. In the next sequence, too, the corresponding bit or the predetermined pulse is then emitted again with a further reduced transmission power, this process being repeated until the corresponding bit or the corresponding pulse is no longer recognized by the base device. In the absence of the confirmation signal, the transmission power is then no longer reduced, but may be set one level higher.
- an inverse confirmation signal is used, so to speak, i.e. an acknowledgment signal is only sent when the pulses reduced in the transmission power are no longer received. As long as these pulses are received, no confirmation signal is sent, and the operator panel reduces the corresponding pulses by one level in each cycle. Since less information is transmitted overall with this variant, communication is faster.
- This procedure not only extends the life of the batteries of the control units, but also increases the security of transmission, since the transmission power is set optimally, which in turn minimizes the mutual interference of the IR receiver of the individual IR controls.
- buttons and for movement can be transmitted separately. This can take place in the same time window of different cycles; however, it is also possible to transmit the information in different time windows of the same cycle.
- an additional brief information of the other time window that is to say, for example, the state of the keys, and conversely, a short information about the movement when the keys are transmitted. This gives you a faster response to changes, which is particularly important for game pads.
- FIG. 1 shows a basic circuit diagram of a basic device which communicates bidirectionally with a large number of operating devices; 2 shows a block diagram of a basic device and an operating device; Fig. 3 is a timing diagram of a sequence of communication between the
- Fig. 5 is a timing diagram of carriers and on modulated pulses for a logic "0" and a logic "1".
- a base device 1 which has an IR transmitter module 1s and an IR receiver module 1e.
- the emitted or received IR rays are indicated by an arrow.
- the base device communicates with a large number of operating devices 2, 3, 4, 5, each of which likewise has an IR transmitter module 2s, 3s, 4s, 5s and an IR receiver module 2e, 3e, 4e, 5e.
- the number of operating devices is basically freely selectable and, as a result, only influences the cycle time described further below in connection with FIG. 3.
- Fig. 2 shows a block diagram of base unit 1 and an operating device 2.
- the base unit contains a microprocessor 6, which controls an IR transmitter unit 7 and an IR receiver unit 7 ', which is also connected to the microprocessor 6 is connected.
- the basic device contains a memory component, for example an EEPROM 8, and an interface 9, which can be a serial or parallel interface and which is connected to a device to be controlled, such as a computer (not shown).
- the control unit 2 also contains a microprocessor 10, an IR transmitter unit 11 and an IR receiver unit 12, which are each connected to the microprocessor 10.
- the control unit 2 also contains a memory module 13, which can also be an EEPROM, a power supply 14, such as a battery, as well as one or more "interfaces" for operating elements, e.g. Keys 15, which are in principle electrical switches, and other input elements, such as Motion detector 16 of a mouse or joystick.
- Fig. 3 shows the IR transmission protocol using the example of four operating devices.
- the pulses emitted by the transmitter module 1s are denoted by StS and are transmitted during a first time period Tr and received by all IR receiver modules that are within range.
- This start or trigger pulse has a predetermined length and synchronizes all operator panels. This is followed by a pause P with a predetermined length.
- a first time window F1 then begins, in which the IR transmitter module of a first operating device transmits its message T1 to the IR receiver module 1e of the base device.
- the time window F1 also has a predefined length.
- the IR receiving module 1e of the base unit receives these pulses, which are referred to as StE on the receiving side.
- a pause P whereupon the IR transmitter module of the second operating device sends its pulses T2 with a predetermined length in the time window F2, which are also received by the IR receiver module 1e of the base device.
- the third and fourth base units then transmit in the time windows F3 and F4.
- a cycle is ended and the base unit sends a new trigger pulse in the next time window Tr, with which a new cycle begins.
- the individual cycles can follow one another continuously. However, it can also be provided that a cycle is only followed by a new cycle or several cycles when one of the operating devices has sent a request signal to the basic device. The cycles can also be stopped if none of the operating devices has transmitted information for a predetermined number of cycles.
- the time windows F1-F4 are each of the same length. However, it is also possible to make the time windows of different lengths, each operating device being able to be programmed in an initialization phase, when, based on the start pulse, "its" time window begins and how long it is.
- the base unit must of course have the same information so that it can assign received pulses to the respective control unit.
- the basic device uses the transmitted information, such as e.g. a so-called device code, identified and not based on the time window assigned to the respective operator panel. In this case, each operator panel “knows” when "its" time window begins and ends in relation to the start pulse. In this variant, the basic device does not "know" which time window is assigned to which operating device.
- Both identification methods i.e. Time window / device code, combine with each other, one information is then used to verify the other information. This increases data transmission security. If the identification takes place solely on the basis of the assigned time window, the device code need not be transmitted, as a result of which the transmitted word length is reduced and communication takes place more quickly.
- Fig. 4 shows the transmission protocol that is sent within a time window.
- the upper line shows the transmission protocol for the movement of a joystick or a mouse.
- a first bit 1 is the start bit, which is always a logical "1" here. This is followed by five bits D5 ... DO, which identify the respective device, for example whether it is a mouse, a keyboard or another device.
- a bit B0 which indicates the status of the battery of the control unit. Is the battery voltage has dropped below a certain value, a logical "0" is transmitted, otherwise a "1".
- S3, S2, S1 and SO which indicate the step size, i.e. the amount of the mouse speed. Then follow four bits W3, W2, W1 and WO, which represent the angle of the mouse movement.
- a bit Tx can follow, which contains information about the keys, for example a "1" when a mouse button is pressed and a "0" when the key is released. This means that information about the keys can also be sent in the transmission protocol for the mouse movement, which increases the processing speed, since the next time window that contains the full information about the keys is not waited for.
- time windows not all time windows, as shown in Fig. 3, must be occupied with messages. If a control element does not send a message to the base unit in one cycle, this time window remains unoccupied. As a result, there can be no overlap of the IR information by different operating devices, which prevents interference in the IR transmission and thus also delays the information transfer, since multiple transmission of the same information is unnecessary.
- any number of IR control elements can interact with a basic device. All operating devices work quasi-simultaneously within a cycle, since the time offset of the time windows is not noticeable for the user.
- the cycle time is determined by the length of the trigger information, the number of operator panels and the information content (word length). In principle, the maximum number of control elements is freely programmable and only affects the cycle time.
- the respective transmitter modules send out a carrier with a carrier frequency of here 56 kHz or a period of 17.9 ⁇ s, and a burst contains 14 carrier pulses and thus a duration of 250 ⁇ s. A pause is also 250 ⁇ s in length.
- a bit then has a length of 500 ⁇ s.
- a logical "1" consists of a burst (14 carrier pulses) and a pause.
- a logical "0" consists of a pause and a burst.
- the bottom line shows an example of a data word with the bit sequence 11001011.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01914815A EP1269443B1 (en) | 2000-03-27 | 2001-03-23 | Infrared communications device |
DE50101608T DE50101608D1 (en) | 2000-03-27 | 2001-03-23 | INFRARED COMMUNICATIONS DEVICE |
AU2001242086A AU2001242086A1 (en) | 2000-03-27 | 2001-03-23 | Infrared communications device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10014595.7 | 2000-03-27 | ||
DE10014595A DE10014595A1 (en) | 2000-03-27 | 2000-03-27 | Infrared communication device |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001073719A2 true WO2001073719A2 (en) | 2001-10-04 |
WO2001073719A3 WO2001073719A3 (en) | 2002-04-04 |
Family
ID=7636157
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT2001/000087 WO2001073719A2 (en) | 2000-03-27 | 2001-03-23 | Infrared communications device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1269443B1 (en) |
AU (1) | AU2001242086A1 (en) |
DE (2) | DE10014595A1 (en) |
WO (1) | WO2001073719A2 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3119876A1 (en) * | 1981-05-19 | 1982-12-16 | Wilhelm Ruf KG, 8000 München | Infrared transmitting/receiving system |
US5297144A (en) * | 1991-01-22 | 1994-03-22 | Spectrix Corporation | Reservation-based polling protocol for a wireless data communications network |
US5881366A (en) * | 1996-05-01 | 1999-03-09 | Logitech, Inc. | Wireless peripheral interface |
WO1999027662A2 (en) * | 1997-11-21 | 1999-06-03 | Maxim Integrated Products, Inc. | Variable gain optical communication |
EP0948166A1 (en) * | 1997-09-30 | 1999-10-06 | Sony Corporation | Method for radio communication and device for radio communication |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2106309B2 (en) * | 1971-02-10 | 1973-01-25 | Robert Bosch Elektronik Gmbh, 1000 Berlin Und 7000 Stuttgart | PROCESS AND SYSTEM FOR WIRELESS CONTROL OF AT LEAST TWO OBJECTS VIA ONLY ONE HIGH FREQUENCY CHANNEL |
FI98675B (en) * | 1995-02-17 | 1997-04-15 | Nokia Telecommunications Oy | Allocation of time intervals in a mobile communication system |
-
2000
- 2000-03-27 DE DE10014595A patent/DE10014595A1/en not_active Withdrawn
-
2001
- 2001-03-23 EP EP01914815A patent/EP1269443B1/en not_active Expired - Lifetime
- 2001-03-23 WO PCT/AT2001/000087 patent/WO2001073719A2/en active IP Right Grant
- 2001-03-23 DE DE50101608T patent/DE50101608D1/en not_active Expired - Lifetime
- 2001-03-23 AU AU2001242086A patent/AU2001242086A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3119876A1 (en) * | 1981-05-19 | 1982-12-16 | Wilhelm Ruf KG, 8000 München | Infrared transmitting/receiving system |
US5297144A (en) * | 1991-01-22 | 1994-03-22 | Spectrix Corporation | Reservation-based polling protocol for a wireless data communications network |
US5881366A (en) * | 1996-05-01 | 1999-03-09 | Logitech, Inc. | Wireless peripheral interface |
EP0948166A1 (en) * | 1997-09-30 | 1999-10-06 | Sony Corporation | Method for radio communication and device for radio communication |
WO1999027662A2 (en) * | 1997-11-21 | 1999-06-03 | Maxim Integrated Products, Inc. | Variable gain optical communication |
Also Published As
Publication number | Publication date |
---|---|
DE50101608D1 (en) | 2004-04-08 |
DE10014595A1 (en) | 2001-10-11 |
WO2001073719A3 (en) | 2002-04-04 |
AU2001242086A1 (en) | 2001-10-08 |
EP1269443B1 (en) | 2004-03-03 |
EP1269443A2 (en) | 2003-01-02 |
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