JPS63219499A - Recognition device for position of seat - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The explanation will be given in the following order.

A. Industrial application field B. Summary of the invention C Conventional technology D. Problem that the invention aims to solve E. Means to solve the problem (Figure 1) F. Effect G Example (Figure 1) Effect of H invention A. Industrial application field The present invention relates to a seat position recognition device.

B. Summary of the Invention This invention provides a method for recognizing the seat position based on the light source by receiving output light from a light source installed on a wall, etc., when the seat position can be changed. This is what I did.

C. Conventional Technology International passenger planes are equipped with audio/video systems to prevent passengers from getting bored as much as possible, even on long flights. Additionally, service systems such as reading lights and stewardess call lights are installed to accommodate the individual needs of passengers.

Figure 2 shows an example of such a system. In the figure, (100) is a transmitting device installed in the crew cabin, (200) is a terminal device installed in each seat in the cabin, ( 300) is PSU (Basenger Service)
unit), and in this example, the transmitting device (10
This is a case where seven downlink channels and one uplink channel are prepared between the terminal device (200) and the terminal device (200) using a frequency division method.

Then, in the transmitting device (100), (110) to (
113) indicates a VTR, which is composed of 8mm video, and the VTR (110) is used for overrides and has a tape cassette recorded with instructions on how to put on a life jacket, etc., and the VTR (111) ~(1
13) is for general use and contains tape cassettes that record movies and the like. In this way, VTR (110)
- (113), a video signal (1), a stereo audio signal (R) in the first language, and a monaural audio signal (A) in the second language are taken out.

Further, (114') is a TV tuner, (115) is a still image reproducing device, such as a CD-ROM player, and this player (115) includes a guide map of the airport,
A CD containing various procedures is included. Then, the video signal (1) and the audio signals (R, A) are taken out from the devices (114) and (115').

Further, (121) to (129) indicate CD players, and stereo audio signals such as music or R are taken out from these players (121) to (129).

In addition, (131) is the microphone for in-flight announcements, (
132) is the AV control unit, (132A) is the announce switch, (132B) is the override switch, (132C) to (132E) are the VTR (111)
~(113) is a pose switch.

Furthermore, (141) to (148) indicate memory cartridges, and cartridges (141) to (147) are, for example, M
ROM used in SX standard personal computers
It is a cartridge, and programs such as games are written in its ROM.

In addition, the cartridge (148) has a built-in RAM,
This stores programs and data such as in-flight service menus. The programs or data of these cartridges (141) to (148) are time-division multiplexed into a serial signal by a multiplexer (149), as will be described later.

Further, (151) and (152) indicate encoders.

These encoders (151') and (152) are CA
It is called a D^ encoder, and the details of its signal form will be described later, but one encoder converts a 16-channel monaural audio signal (or 8-channel audio signal for stereo) into a PCM signal. This multiplexed signal is time-division multiplexed, and a command signal for controlling the terminal device (200) is added to this multiplexed signal, and the output signal has approximately the same bandwidth as a general video signal.

Furthermore, (161) to (167) are modulation circuits, (169)
) is a duplexer that separates the downstream channel signal and the upstream channel signal, and (105) is a controller that controls each of the above-mentioned circuits and the terminal device (200), which is constituted by a microcomputer. This controller (105) includes a duplexer (1
69) and a decoder (106), each terminal device (2
Commands, data, etc. from 00) are supplied.

Further, (101) indicates a mask control unit composed of a microcomputer, and this unit (101) controls the transmitting device (100) and the terminal device (2).
00) is centrally managed and controlled. Therefore, the unit (101) is connected to a controller (105), a keyboard ('102) is connected as a means of inputting data, etc., a CRT display (103) is connected as a monitor, and an F.
DD/+100 (104) is connected.

During normal operation, the video signal V and audio signal A from the VTR (111) are sent to the switch circuit (116).
, (117) to the modulation circuit (161), and the video signal V and audio signal A from the devices (112) to (115) are supplied to the modulation circuit (162) to
(165) and modulation circuits (161) to (165).
) are modulated by signals V and A in the same manner as broadcast wave signals in general television broadcasting, and modulated signals of different channels are extracted, and these signals are supplied to an adder circuit (16B).

Also, the audio signals L to A from the VTR (111) are passed through the switch circuit (116) to the encoder (151').
), and the devices (112) to (115)
, (121) to (129) and the output signal of the multiplexer (149) are supplied to encoders (151) and (152) to form two time-division multiplexed signals, and these signals are sent to the modulation circuit. (16
6) and (167) and are used as modulated signals of empty channels, respectively, and these signals are sent to the adder circuit (167).
68).

Therefore, the modulation circuit (16) is connected to the adder circuit (168).
The modulated signals from 1) to (167) are frequency multiplexed and extracted.

This multiplexed signal is sent to a duplexer (16
9) and is sent to the leaky cable (171) as a down channel signal. This cable (171) is a coaxial cable with a notch formed in a spiral shape so that signals passing through the notch leak to the outside.

Therefore, in normal times, the devices (111) to (115)
The reproduced video signal V and audio signal are frequency multiplexed and sent to the cable (171), and the devices (111') to (115).

The audio signal L-A reproduced by (121) to (129) and the program or data of the cartridges (141) to (148) are time-division multiplexed, frequency multiplexed, and sent to the cable (171). It will be.

Also, during in-flight announcements, the announce switch (132
When A) is turned on, the control signal from the unit (132) causes the devices (111) to (115) and (121
) to (129) are put into a pause state, their reproduction signal system is muted, and the switch circuit (
117) is connected in the opposite way to the diagram, and the microphone (
The announcement audio signal from the unit (131) is supplied from the unit (132) to the modulation circuit (161) through the switch circuit (117) and converted into an FM signal similar to the audio broadcast wave signal in general television broadcasting. is supplied to the adder circuit (16B).

Furthermore, at this time, the audio signal A from the microphone (131) is transmitted from the unit (132) to the encoder (
151), and a command signal indicating the announce mode is supplied from the controller (105) to the encoders (151'') and (152) based on the signal indicating the state of the unit (132).

Therefore, at the time of in-flight announcement, the modulation circuit (161)
The encoder (151) sends out the audio signal A of the announcement, and also sends out a command signal indicating the announcement mode.

Note that when the announce switch (132A) is turned off, the above-mentioned normal mode is restored.

Furthermore, at the time of override, when the override switch (132B) is turned on, the devices (111) to (115),
(121) to (129) are in the pause state, and VT
R (110) is put into the reproducing state, and the switch circuit (116) is switched to the opposite state as shown in the figure, so that the VTR
(110) playback signal ■ and LA are the modulation circuit (161
) and the encoder (151).

At this time, the controller (105) also operates the encoder (1) based on the signal indicating the state of the unit (132).
A command signal indicating the override mode is supplied to 511 and (152).

Therefore, when overriding, V
TR (111") (7) Reproduction signals V and LA are sent out in place of VTR (110") (7) At the same time, the reproduction signals V and LA are sent out, and a command signal indicating this override mode is sent. Sent out.

In addition, when overriding, press the announce switch (132
When A) is turned on, the switch circuit (117) and the encoders (151) and (152) are controlled so that only the audio signal A from the microphone (131) has priority.

On the other hand, since the terminal device (200) is provided for each passenger seat, the cable (171) is wired along the seat.

In the terminal device (200), (201) indicates a transmitting/receiving antenna (coupler), which is a cable (17).
1), the transmitting device (100) and the terminal device (200
) to access signals between.

Further, (203) and (204) indicate tuners, and in the tuner (203), modulation circuits (161) to
The modulated signal from (165) is selected, and the original video signal V (and audio signal A) is demodulated from the selected modulated signal, and in the tuner (204), the modulation circuit (166), A modulated signal from (167) is selected, and a time division multiplexed signal from the selected modulated signal, ie, a time division multiplexed signal from encoder (151') or (152), is extracted.

Furthermore, (205) indicates a decoder, which performs processing opposite to that of encoders (151) and (152).

Further, (206) indicates a display selection unit, which, as will be described later, has a color picture tube (61) and various operation switches, and is also capable of connecting headphones (207) and a joystick (208). There is.

Further, (209'') indicates a microcomputer of the MSX standard, which mainly performs display processing in the picture tube (61).Furthermore, (219) is a transmitting circuit for the up channel, and (214) is a , a sensor that detects the status of the passenger in each seat, such as whether the passenger is seated and whether the seatbelt is correctly set. (220) is a microcomputer that controls the entire terminal device.

FIG. 3 shows an example of the display selection unit (206), and the color picture tube (61) is, for example, an index beam type flat color picture tube. Further, (62) is a reading light switch, (63) is a stewardess call switch, and (64) is a connector to which a joystick (208) is connected.

Furthermore, (65) is a television switch for selecting a mode for the reproduction signals V (and LA) of the devices (111) to (115), and (66) is a television switch for selecting the reproduction signal V (and LA) of the players (121) to (129). , R selection mode music switch, (6
7) is a channel up/down switch that selects a channel (playback signal) from among the modes selected by switches (65) and (66), and (68) is a display that digitally displays the channel number of the selected channel. It is a means.

Further, (71) is a menu switch for displaying a menu on the picture tube (61), and (72) is a menu switch for displaying a menu on the picture tube (61).
1) is a cursor key (switch) for moving the cursor displayed up and down, (73) is an enter key for validating the item specified by the cursor, (74) is
This is a sliding knob for adjusting the volume of the headphones (207).

The display selection unit (206) is provided on the back of the seat in front of the seat where the user is sitting, as shown in FIG. 4, for example.

Further, a PSU (300) is provided on the wall of the aircraft corresponding to each seat, and a reading light (301) and a stewardess call light (302) are connected to the PSU (300), and a control signal is supplied from a controller (105).

In normal times, the frequency multiplexed signal sent out to the cable (171) is picked up by the antenna (201), and this signal is supplied to the tuners (203) and (204) through the duplexer (202).

When the switch (65) is pressed, the mode is set to television, and when the switch (67) is pressed, the modulation circuit (161) is activated in the tuner (203).
The output signal of ~ (165) is selected and the device (111”)
The switch (of the reproduced signals V and A from ~(115)
The signals V and A of the designated channel are extracted in step 67), and the signal V is supplied to the picture tube (61).

Also, at this time, the output signals of the modulation circuits (166) and (167) are selected in the tuner (204), and the output signals of the encoder (151) or (152) are supplied to the decoder (205). )
The audio signal L-A of the channel specified by the switch (67) is decoded at the decoder 11, and this signal is supplied to the headphones (207) through the unit (206).

Therefore, by operating the switches (65) and (67), any one of the signals reproduced by the devices (111) to (115) can be viewed.

Further, when the switch (66) is pressed, the music mode is set, and when the switch (67) is further pressed, the modulation circuit (166),
The output signal of (167) is selected and the encoder (1
The output signal of (51) or (152) is sent to the decoder (205).
), and in this decoder (205), the audio signal of the channel specified by the switch (67),
R1, that is, the playback signal R specified by the switch (67) among the playback signals from the players (121) to (129) is decoded, and this signal R is decoded by the unit (
206) to the headphones (207).

Furthermore, when the menu switch (71) is pressed,
The menu program and data of the cartridge (148) are taken out from the decoder (205), loaded into the microcomputer (209), and executed.

As a result, a menu screen is displayed on the picture tube (61),
When you use the cursor key (72) to move the cursor to a desired item on this menu screen, for example, the game item, and press the enter key (73), the game menu will be displayed, and furthermore, among the game menus, When you place the cursor on the desired game name and press the enter key (73), the program for the game specified by the cursor, that is, the program prepared in the cartridges (141) to (147), is sent from the decoder (205). The game is loaded into the microcomputer (209'), and the game can then be played using the game stick (208).

In this way, during normal times, the devices (111) to (115)
.

(121)-(129), (141)-(147
) software can be used freely.

At this time, data indicating the usage status of the software at each seat is output from the microcomputer (220).
This data is supplied to the transmitting circuit (219) and made into an uplink channel signal, and this signal is sent to the transmitting circuit (219)→
Duplexer (202) → Antenna (201) → Cable (171) → Duplexer (169) → Decoder (1
06) is supplied to the decoder (10B) and the original data is extracted, and this data is supplied to the unit (101) through the controller (105),
The usage status of the software at each seat is aggregated and managed.

Also, at the time of an announcement, a command signal indicating the announce mode is sent to the downlink channel, which is taken out from the decoder (205), and this command signal causes the decoder (205) to send the signal from the microphone (131) to the encoder ( The audio signal A is forced to the channel of the announcement audio signal A sent through the headphones (20
7). In addition, at this time, headphones (20
The volume of 7) is set to a constant value regardless of the position of the volume knob (74). Furthermore, if a game is in progress, the game is set to Bose mode.

Furthermore, at this time, if necessary, the player (115)
The video signal V of the image corresponding to the announcement is extracted from the video signal V, which is forcibly selected by the tuner (203) and supplied to the picture tube (61), where the still image corresponding to the announcement is displayed.

After the announcement ends, a command signal indicating this causes the terminal device (200'') to return to the state before the announcement.

In addition, at the time of override, a command signal indicating this forcibly selects the signals V, L, and R from the VTR (110) in the same manner as at the time of announcement, and these signals are selected from the picture tube (110).
61) and headphones (207”)
is supplied to

Note that when a trouble occurs in the encoders (151), (152) or the decoder (205), the audio signal A from the modulation circuits (161') to (165) is forcibly selected.

Further, when the reading light switch (62) is pressed, the seat number and a command signal indicating that the switch (62) has been pressed are sent to the controller (105) through the upstream channel in the same manner as described above. Then, in the controller (105), a command signal (which also has a seat number) to turn on the reading light (301) is formed based on this command signal, and this command signal is assigned to the seat where the switch (62) is pressed. The reading light (301) is turned on by being supplied to the PSU (300).

At this time, the controller (105) supplies the unit (101) with data indicating that the reading light switch (62) has been pressed and data on the seat number, and the reading light (301) is supplied to the unit (101). The on/off state of the lights is managed.

Note that the reading light (301) is turned off by pressing the switch (62) again, and this is processed in the same way as when it is turned on.

Further, when a predetermined key is pressed on the keyboard (102), a command signal having a command to turn on/off the reading light (301) and its seat number is supplied to the controller (105), and this is transmitted to the corresponding one through the down channel. Supplied to the terminal device (200), the reading light (3
01) is turned on and off.

That is, in this case, the mask control unit 7)
Reading lights (301) for each seat can be controlled from (101).

Also, when the stewardess call switch (63) is pressed, the call light (302) is turned on in the same way as when the reading light (301) is turned on, and this is managed in the unit (101), and the display (103).

Furthermore, the state of the seat detected by the sensor (214) is also sent to the controller (105) along with the seat number.
It is managed by a unit (101).

FIG. 5 shows the signal format of the time division multiplexed signals output from the encoders (151) and (152).
This is an improved signal format proposed in Japanese Patent Application No. 59-170925 and others.

That is, this multiplexed signal is a serial binary signal St consisting of a large number of superframes, as shown in FIG.
1 to F256, and the l frame is composed of 168 bits as shown in FIG.
The period is 1/32kHz. Each frame includes an 8-bit synchronization code 5YNC, a 4-bit service bit SB, and a 32-bit x 4 data block BL.
KANBLKD and 7 bits x 4 error correction bits E
CC in this order.

In this case, as shown in FIG.
2 to F256 are used as frame sync FS, and the bit patterns are different between super frame sync SS and frame sync SS.

Further, although details of the service bit SB will be described later, one unit is 77 frames, and includes data such as commands and seat numbers.

Furthermore, each of the data blocks BLKA to BLKD is composed of 32 pinpoints, and independently constitutes four blocks BIJA to BLKD. And this block BLKA -BLKD
is divided into four channels M1 to M4 of 8 bits each, as shown in FIG.
It is assumed to be a PCM signal sampled at Hz.

Therefore, in one frame, four blocks BLK
Since there is A-BLKD and each block has four channels M1 to M4, a total of 16 channels of audio signals can be transmitted simultaneously in a time-division manner using one signal St.

In addition, each channel has a sampling frequency of 32k.
flz, the number of quantization bits is 8 bits, so it is almost the same standard as PCM audio in 8 mm video.

Further, programs or data from the memory cartridges (141) to (148) are transferred to a multiplexer (149).
), this signal is made into a bit-sequential time-division signal, and this signal is used as it is as one of the 16 channel signals, and when each program or data is sent out to the last bit, it is sent out again from the first bit.

Note that one channel is 8 bits, and the number of cartridges (141) to (148) is eight, so in the channel that transmits the program or data of these cartridges (141) to (14B), the first bit is The 8th bit corresponds to the program or data of the cartridges (141) to (14B), and the transmission speed of each program or data is 32 kbps.

Furthermore, the error correction code FCC performs error correction for each of the blocks BIJA to BIJD by 7 bits.

Since the signal St has the above format, its transmission bit rate is 168 bits x 32k)lzW5.4 Mbps, and 1/2 of that is the Nyquist frequency, so if there is a video signal bandwidth, the signal This means that St can be transmitted.

Therefore, as mentioned above, the encoder (151).

(152) can time-division multiplex audio signals of 16 channels each, and the time-division multiplexed signals can be frequency multiplexed with other video signals.

Further, the service bit SB is used, for example, in the format shown in FIG. That is, service bit SB
There are 4 bits per frame, and these 4 bits are sequentially designated as bits 81 to B4. As schematically shown in Figure A, if 77 consecutive frames are made into a set and the 77 frames are arranged vertically in frame units, the size of the service bit will be 77 bits vertically x 4 bits horizontally. .

Therefore, as shown in FIG.
A is formed, and similarly, second to fourth packets PKTC-PKTD are formed by each of 77 bits B2 to B4.

Then, as shown in FIG. B, packets PKTA to PK
Each TD consists of seven words W of 11 bits each in turn.
It is divided into RDA-WRDG, and as shown in C of the same figure,
In each word, the first bit is the start bit 5TRT with a "0" level, and the following 8 bits are the start bit 5TRT.

At the same time as the data bit DTBT, the next bit is used as the parity bit PRTY, and the last bit is “
The stop bit of 1'' level is 5TOP.

And, although the data bit DTBT is the packet PK
In each of TA to PKTO, data bit DT
There is one BT per word (II), and there are seven words per 77 frames (7 bytes), so there are 7 data bits DTBT (7 bytes) per 77 frames.
Therefore, the total data bits DTBT are equivalent to 4 packets of 8 bytes.

Of the data bits DTBT, the data bits DTBT of the second packet PKTB have the first byte as a header HDER with a predetermined bit pattern ("AA" in hexadecimal value), as shown in the figure. 2 bytes are the command CMD, and the 3rd and 4th bytes are the address AD indicating the seat number (the number of the terminal device (200))
Status information 5 which is RS and whose 5th and 6th bytes indicate data or parameters accompanying the command CMD.
TTS, and the last byte is checksum CS.

In this case, since command CMD is 1 byte long, a maximum of 256 types of commands can be set, and address ADR5
is 2 bytes long, so it is possible to specify up to 650,000 or more seats.

Therefore, data bit DT of this packet PKTB
According to BT, the transmitting device (100) is connected to the terminal device (200).
), or even a predetermined operation, such as a reading light (
212) can be controlled to turn on or off.

Furthermore, the data bit DTBT to the first packet PKT
Since there is only one uplink channel, this is used as a flag to indicate the usage status of this uplink channel, and when the uplink channel is in use, the flag is set. Therefore, the terminal device (200) can determine whether the uplink channel can be used based on the data bit DTBT of this packet PKTA, and when it is in use, it will not issue commands (and data) to the transmitting device (100) until it becomes free. stand by.

Note that the third and fourth packets PKTc and PKTD are undefined.

In addition, in the upstream channel, only the above-mentioned service bit SB is sent in the state of a PSK signal using the formant described in FIGS. 6B to 6D and at a bit rate of 32 kbps, which is the same as that of the downstream channel.

Therefore, the mask unit (101') can obtain data regarding the specific terminal device (200).

Therefore, according to the above service system, passengers can freely enjoy their favorite audio/video software while remaining in their seats. Also,
Calling a stewardess is also easy.

Furthermore, stewardesses can easily know each passenger's requests regarding meals, etc., which reduces their burden and allows them to provide various services in a detailed manner.

Furthermore, since the audio/video system and the service system are integrated, the entire system can be simplified and expandability can be improved.

Furthermore, on passenger aircraft, the number and position of passenger seats may be changed due to operational reasons, but the transmitter (
100) and the terminal device (200) are connected to the cable (171).
) and antenna (201), and is not connected by a general connector, so the terminal device (200)
That is, when changing the number or position of seats with built-in seats, the change can be easily made without requiring large-scale wiring work.

D Problems to be Solved by the Invention However, as described above, when the transmitting device (100) and the terminal device (200) are connected wirelessly,
If the number or position of the seats (terminal devices) is changed, the number, position, or seat number of the seats or terminal devices (200) becomes unknown when viewed from the transmitting device (100).

This invention attempts to solve these problems.

E. Means for Solving Problems Therefore, in this invention, when the seat position can be changed, the light source can be used as a reference by receiving the output light from a light source installed on a wall or the like. This allows the seat position to be recognized.

F If the number or position of active seats is changed, this can be known from the transmitter side.

G. Embodiment In FIG. 1, (2) indicates the seats for passengers, and in this figure, the seats (2) are shown arranged in -rows in the longitudinal direction (front-back direction).

As mentioned above, the seat (2) is equipped with a terminal device (2).
00) is built-in, and its antenna (20
1”) is routed along the seat (2)
171).

Further, a photosensor (231) is provided on the upper part of the backrest of the seat (2), for example. In this case, this sensor (231) is provided with a lens, an infrared filter, etc., so that it detects only infrared light from a predetermined direction, and its detection output is transmitted to the microcomputer (220') of the terminal device (200'I). ).

In addition, the microcomputer (220) of the terminal device (200) has the following information:
ROM in which the machine number of this terminal device (200) is written
(not shown) is connected.

Further, a reading light (301) is installed on the wall of the cabin, and this reading light (301) can be rotated in the front and back direction of the seat (2) by a drive means (311) having a motor, gears, etc. and therefore a reading light (
The irradiation angle of the output light from the seat (301) changes in the front and rear directions of the seat (2). Further, an angle sensor (312) constituted by a photo-ink rubber or the like is coupled to the reading light (301) or the means (311), and the reading light (
301) or the irradiation angle of the output light is detected, and the detection output is supplied to the controller (105) of the transmitter (100) through the PSU (300).

When the position of seat (2) is changed, the mask unit (Lot) or controller (105) performs the following process to determine the seat number of seat (2) or terminal device (200). be done.

First, the command signal of the controller (105) is
(300) and a large number of reading lights (30
Among 1), only the Nth reading light (3N) is lit,
The other reading lights (300) are turned off.

Further, the drive means (311) that is coupled to the reading light (3N) is controlled, and the reading light (3N) is swung back and forth.

Also, at this time, the controller (100) polls the terminal devices (200) in order, and the photosensor (2)
31) is sent back to the controller (105) in order for each seat (2). Note that the machine number of the terminal device (200) is used as the polling address at this time.

Then, in this case, the reading light (3) of the seat (2)
The output of the sensor (231) is maximum at the terminal device (200) of the N-th seat (2N) arranged corresponding to seat (2N), and the output of the sensor (231) at other seats is not obtained, or Even if the seat (2N) sensor (2
This is sufficiently small compared to the output of the 31").

Therefore, the controller (105) determines that the seat (2N) for which the output of this sensor (231) is maximum corresponds to the reading light (3N), and from then on, the seat (2N)
N) is considered the Nth seat, i.e. address A
SRS is assumed to be ``N''.

Also, when the reading light (3N) is swung, the seat (2
Reading light (3) where the output of sensor (231) of N) is maximum
There is a certain width in the angle of N), but when it is at the center, it is sufficient to judge that the reading light (3N) is facing the sensor (231). Therefore, the angle sensor (312) The angle of the reading light (3N) is detected. Furthermore, if the angle of the reading light (3N) is offset based on this angle, then the reading light (3N) will illuminate the area near the passenger.

Then, perform the above processing on all reading lights (301).
By doing this for each seat (2), the controller (105) or mask unit (101) can recognize the position, seat number, or total number of seats for all seats (2).

Thus, according to the present invention, since the seat (2) is made to correspond to the reading light (301), the seat (2) is made to correspond to the reading light (301).
2) Even if there is a change in the position or number of seats, the seats (
2) The location or seat number can be recognized. Further, the optimum irradiation position of the reading lamp (301'') can also be set from the transmitter (100).

Although the above description has been made using a passenger plane as an example, the present invention can also be applied to vehicles such as trains and buses, or to theaters and stadiums, as long as the service is provided to a large number of customers.

H Effects of the Invention According to this invention, since the seats (2) are made to correspond to the reading lamp ('301), even if the position or number of seats (2) is changed, the reading lamp ('301) is automatically changed. The location of the seat (2) or the seat number can be recognized immediately. In addition, the optimum irradiation position of the reading lamp (301) is also determined by the transmitting device (10).
It is also possible to set from 0).

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an example of the present invention, and FIGS. 2 to 6 are diagrams for explaining the same. (100) is a transmitter, (101) is a mask control unit, (110) to (115'), (12
1) to (129) are video signal or audio signal sources, (151) and (152) are encoders,
(161) to (167) are modulation circuits, (200) is a terminal device, (205') is a decoder, and (206') is a selection display unit.

Claims (1)

[Scope of Claims] In a case where the position of the seat can be changed, the light source includes a light source provided at a fixed position such as a wall surface, and a light receiving element that is provided on the seat and receives the output light of the light source, A seat position recognition device, wherein output light from a light source is received by the light receiving element, and the position of the seat is recognized based on the light source based on the magnitude of the amount of received light.