JP2576485B2 - Information transmission equipment in vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial Field of Use B Summary of the Invention C Prior Art D Problems to be Solved by the Invention E Means for Solving the Problems (FIG. 1) F Function G Embodiment G ₁ Explanation on the Sending Side G ₂ Description of Receiving Side G ₃ Description of Other Embodiments H Effects of the Invention A Industrial Field of the Invention The present invention relates to a video display device individually provided in or near a passenger seat of, for example, an aircraft, a train, a bus, or the like. The present invention relates to an information transmission device in a vehicle suitable for use in transmitting a plurality of video signals, audio signals, and the like to an audio generation device or the like in parallel.

B. Summary of the Invention The present invention relates to an information transmission apparatus in a vehicle for transmitting a plurality of video signals, audio signals, and the like in parallel from a transmission side to a reception side, by frequency-multiplexing a plurality of video signals, audio signals, and the like. In addition to being transmitted by one signal transmission means, data indicating a reception state is transmitted from the reception side to a transmission side via the single signal transmission means in response to a request from the transmission side so that the data can be used. Accordingly, the apparatus is simplified and the usability of the transmitting user is improved.

C Prior Art For example, U.S. Pat. No. 4,584,603 shows that a video display is provided separately on a passenger seat of a vehicle such as an aircraft. That is, a video display is individually provided in the passenger seat, and a plurality of video signals are transmitted to these video displays in parallel, and each video display selects and displays one of the signals.

D Problems to be Solved by the Invention In this conventional device, a plurality of video signals are transmitted to each video display using independent transmission lines, and require many transmission lines. It is. Therefore, there is a problem that the wiring is complicated and the device is complicated.

In view of the above, the present invention is intended to simplify the apparatus and improve the usability of the transmitting user.

E Means for Solving the Problems The information transmission device in the vehicle according to the present invention comprises, for example, a central control device as shown in FIG. 1, a terminal device (30) provided for each passenger seat, and a central control device. Equipment and this terminal equipment (30)
And a bi-directional signal transmission means (21) for connecting the video signal sources (1) to (3), (2) and (3). ), And a plurality of audio signal sources (1a) to (1d), (2), (3), (4a),
(4b), storage means (9b) to (9h) storing a plurality of game data, and audio signal sources (1a) to (1d),
(2), (3), (4a), time division time-division multiplexing the game data and the control data SC _1, SC ₂ from the audio signal from (4b) and the storage means (9b) ~ (9h) Multiplexing means (6), (7), video signal sources (1a) to (1d),
Frequency multiplexing means (11a) for frequency-multiplexing the video signals from (2) and (3) and the output signals of the time-division multiplexing means (6) and (7) and sending out to the bidirectional signal transmission means (21)
~ (11g), (12), this terminal device (30)
Are selecting means (33), (34), and (34) for selecting a desired video signal, audio signal, or game data from the frequency multiplexed signal transmitted by the bidirectional transmitting means (21).
(35) and the video and audio signals selected by the selection means (33), (34) and (35) or the video and audio signals generated based on the selected game data are supplied. A video device (35a) and an audio generator (35c), and separation means (35) and (36) for separating the control data SC ₁ and SC ₂ from the frequency multiplexed signal.
Control data from this separation means (35) (36)
Depending on the SC _1, SC _2, the selection means (33), (34), (3
Data generation means (35), (36), (38) for generating data indicating the selection state of 5) and the bidirectional signal transmission means (21), and the selection means (33), (34) , (3
And a distributor (32) having a terminal to which data from the data generating means (35), (36), and (38) is input.

F Function In the above-described configuration, a plurality of video signals, audio signals, and the like are frequency-multiplexed by the transmission device, and the bidirectional signal transmission means (2
Since the signal is supplied to the terminal device (30) on the receiving side via 1), the terminal device (30) can selectively extract desired video signals and audio signals by the selection devices (33) to (36). , The user can watch desired video and audio. In the above configuration, the control data SC ₂ are multiplexed by the transmitting apparatus, is supplied to the recipient terminal via a bidirectional signal transmission means (21) (30), the data generating apparatus on the reception side (3
From 6) data indicating the status of the selected device in accordance with the control data SC ₂ (33) ~ (36) is generated, this data is bidirectional signal transmission means (21) via the sending computer (8 ), The transmitting side can use this data for statistics of audience rating.

G Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIG. This example is applied to transmission of video signals, audio signals, and the like in an aircraft.

In the first diagram explaining in G ₁ sender, (1a) ~ (1d) is a video tape recorder which is provided on the transmission side, such as crew compartment. Video tape recorder (1a) is for override,
A cassette tape recording how to put on a life jacket and the like is loaded. In addition, video tape recorders (1b)-(1
In d), a cassette tape on which a movie is recorded is loaded. These video tape recorders (1a) to (1d) are provided with a terminal V for outputting a reproduced video signal and terminals L, R, and A for outputting a reproduced audio signal. These video tape recorders (1a) to (1d) correspond to two languages, terminals L and R are output terminals of a left audio signal and a right audio signal in the language of the first country, respectively, and terminal A is Second
Output terminal for monaural audio signal in national language.

Reference numeral (2) denotes a television tuner. The television tuner (2) is provided with a terminal V for outputting a video signal and terminals L and R for outputting an audio signal. Terminal L
And R are output terminals for a left audio signal and a right audio signal, respectively.

Further, (3) is a still picture reproducing machine, which is a compact disc on which maps, airfield guide maps, etc. are recorded, so-called CDs.
It is made to play ROM. The still picture reproducing device (3) is provided with a terminal V for outputting a still picture video signal and a terminal A for outputting an audio signal.

(4a) and (4b) are audio reproducers each equipped with three compact disk players (CD players) and tape recorders. These audio reproducers (4a) and (4b) have audio Six pairs of terminals L and R for outputting signals are provided. Terminals L and R are output terminals for a left audio signal and a right audio signal, respectively.

Also, (5) is a control device, (5a) is a microphone, (5b) is a volume for adjusting the level of an audio signal from the microphone (5a), (5c) is an announcement key, (5d) is an override key, (5e) to (5g) are pause keys for putting the video tape recorders (1b) to (1d) in a pause state, respectively. Video signal and terminal obtained at terminal V of video tape recorder (1a) and (1b)
The audio signals obtained for L, R and A are supplied to the control device (5). The control device (5) is provided with a video signal output terminal V and an audio signal output terminal L, R, A. These output terminals V, L, R, A are usually provided with a video tape recorder (1b). The video signal obtained at the terminal V and the audio signal obtained at the terminals L, R, A are output. When the override key (5d) is pressed to turn on the override, the video signal obtained at the terminal V of the video tape recorder (1a) is output. The video signal and the audio signal obtained at the terminals L, R, A are output. When the announcement key (5c) is pressed to turn on the announcement, an audio signal from the microphone (5a) is output to the output terminal A.

Further, (6) and (7) are CADA encoders used in conventionally known cable digital audio / data transmission systems (CADA systems). The CADA system is, for example, time-division multiplexing of a plurality of digital audio signals, and allocating a channel (6M
Hz), and is a system that can transmit music and the like extremely efficiently without deteriorating sound quality. CADA
The encoders (6) and (7) are provided with an A / D converter and a shift register, convert a plurality of audio signals into digital signals by the A / D converter, and respectively provide a parallel signal at a predetermined position of the shift register. , And time-division multiplexing is performed by serially outputting at high speed from the shift register. Note that not only digital audio but also control data and data for computer software can be multiplexed together.

The audio signals obtained at the output terminals L, R, A of the control device (5) are supplied to the encoder (6). Output terminals of video tape recorders (1c) and (1d)
The audio signals obtained in L, R and A are supplied to the encoder (6). Further, audio signals obtained at the output terminals L and R of the tuner (2) and the output terminal A of the still picture reproducing device (3) are supplied to the encoder (6). In addition, audio player (4a)
The audio signals obtained at the six pairs of output terminals L and R and the three pairs of output terminals L and R of the audio reproducer (4b) are supplied to the encoders (6) and (7) via the control device (5). You.

Also, the override key (5d), announce key (5c), pause key (5e),
When (5g) is pressed, the control device (5) uses the control data of the content corresponding to the pressed key.
SC ₁ is generated, the control data SC ₁ is supplied to an encoder (6).

The encoder (6), provided with an output terminal A-E the pause control signal in response to the control data SC ₁ is output, the pause control signal obtained at these output terminals A-E, respectively the video tape recorder ( 1b)-(1d),
The audio reproducers (4a) and (4b) are controlled. That is, when the override key (5d) and the announcement key (5c) are pressed, pause control signals are output to the output terminals A to E, and the video tape recorders (1b) to (1d), the audio reproducers (4a) and (4b) ) Are all paused. When the pause keys (5e) to (5g) are pressed, pause control signals are output to the output terminals A to C, respectively, and the video tape recorders (1b) to (1d) are set to the pause state, respectively.

Further, (8) is a master controller consisting of a computer to perform the flight management, the control data SC ₂ for controlling the receiving terminal apparatus is generated from the master controller (8), the control data SC ₂
Is supplied to the encoder (6). The control data SC ₂ is, for example, data such as requesting data, the data indicating the state of the terminal device that controls the brightness of the display device of the terminal device according to the brightness of the room.

(9a) is the ROM where the menu data is written,
(9b) to (9h) are ROMs in which different game data are written. The data SD for computer software read from the ROMs (9a) to (9h) is supplied to a signal processing circuit (10), and after being added with an error correction code and the like, is supplied to an encoder (7).

Further, the control data SC ₁ and SC ₂ is also supplied to the encoder (7) from the encoder (6).

At the output terminal O of the encoder (6), a digitally converted signal of a plurality of supplied audio signals and a time-division multiplexed signal _{SCA1 of the} control data SC ₁ and SC ₂ are obtained. _CA1 is supplied to the modulator (11f) and VSB
AM modulation is performed using the (remaining sideband) method. Further, the output terminal O of the encoder (7), which was digitally converted the supplied plurality of audio signals, control data SC _1, SC ₂
And computer-division-multiplexed signal S _CA2 when software data SD is obtained, the signal S _CA2 is modulator (11
g) and AM-modulated by the VSB method.

The video signal obtained at the output terminal V of the control device (5) is supplied to the modulator (11a), and the audio signal obtained at the output terminal A of the control device (5) is supplied to the modulator (11a). Is done. In the modulator (11a), the audio signal is FM-modulated, frequency-multiplexed with the video signal and made to be similar to a normal television signal, and then A
M modulated.

The video signals obtained at the output terminals V of the video tape recorders (1c), (1d), the tuner (2) and the still picture reproducer (3) are supplied to the modulators (11b) to (11e), respectively. AM modulation is performed by the VSB method.

Here, the modulators (11a) to (11g) are adapted to sequentially modulate, for example, 60 or more television broadcast channels in a frequency band every two channels to prevent cross modulation.

Output signals from the modulators (11a) to (11g) are supplied to an adder (12) and frequency-multiplexed. Then, the signal S _MF is a duplexer is frequency multiplexed from the adder (12) (13)
And supplied to one end of a leaky cable (leakage cable) (21) constituting the bidirectional signal transmission means. A terminating resistor (22) is connected to the other end of the leaky cable (21) and terminated. The leaky cable (21) has, for example, a spiral cutout around the coaxial cable to increase the amount of signal leakage.

G ₂ recipient description Further, (30) is a terminal device provided separately aircraft passenger seat show only one in FIG. In this terminal device (30), (31) is a leaky cable (2
1) an antenna for capturing a frequency-multiplexed signal S _MF leaking from. The antenna (31) frequency-multiplexed signal captured by S _MF television tuner (3 shows a demultiplexer (32)
3) and supplied to the CADA tuner (34). Tuner (3
3) is configured to be able to selectively receive the channels of the output frequency bands of the modulators (11a) to (11e), and the tuner (34) controls the channels of the output frequency bands of the modulators (11f) and (11g). Channel selection in these tuners (33) and (34) is controlled by a selection display device (35).

The video signal and the audio signal output from the tuner (33) are supplied to the selection display device (35), and the time division multiplexed signal _SCA1 or _SCA1 output from the tuner (34) is output.
S _CA2 is supplied to CADA data (36). CADA data (3
6) The CADA encoders described above (6), (7) and is configured to the operation of generally inverted, the control data SC _1, SC ₂ from the time division multiplexed signal S _CA1 or S _CA2, selected display device (35 A desired audio signal and data for computer software are extracted by the control of ()). That, CADA decoder (36) is configured with software register and D / A converter, a time division multiplexed signal S _CA1 or S _CA2 are serially input to the shift register, the control data from the predetermined position of the shift register SC ₁ and SC ₂ are extracted in parallel, and a desired audio signal and computer software data SD are extracted in parallel from a predetermined position of the shift register under the control of the selection display device (35). In this case, the audio signal is converted to an analog signal via the D / A converter. Since two D / A converters are used for stereo time, a total of two D / A converters are sufficient. The audio signal extracted by the CADA decoder (36) is supplied to a selection display device (35). The computer software data SD extracted by the CADA decoder (36) is supplied to a personal computer (37) and written into RAM.

FIG. 2 shows an example of the configuration of the panel surface of the selection display device (35). This panel surface is arranged on the back of the passenger seat as shown in FIG. In FIG.
(35a) is a display device composed of a flat cathode ray tube, a liquid crystal display device, etc., (35b) is a sound output terminal to which headphones (35c) are connected, (35d) is a joystick (35e) for games, etc. Is a game terminal to be connected.

Also, (35f) is a television selection key, (35g) is a music selection key, (35h) is a channel indicator, (35i) is a channel down key, and (35j) is a channel up key. In this case, press the TV selection key (35f) and press the channel down key (35i) and the channel up key (35j)
By sequentially pressing, the television channel is sequentially changed. That is, the receiving channel of the television tuner (33) and the audio signal output from the CADA decoder (36) are changed, and the video tape recorder (1) is displayed on the display device (35a).
b)-(1d), tuner (2), still picture playback device (3)
The screen of the output video signal is sequentially displayed, and the corresponding audio signal is output to the audio output terminal (35b). Here, when the audio signal is in two languages, 1
Two channels are allocated to one video signal screen, and the first channel outputs an audio signal in the language of the first country, and the second channel outputs an audio signal in the language of the second country. Press the music selection key (35g) and press the channel down key (35i) or channel up key (3
By sequentially pressing 5j), the music channels are sequentially changed. That is, the audio signal output from the CADA decoder (36) is changed, and the audio signals output from the audio reproducers (4a) and (4b) are sequentially output to the audio signal output terminal (35b).

(35k) is a menu display key, (35l) is a cursor down key, (35m) is a cursor up key, (35n)
Is the enter key. In this case, by pressing the menu display key (35k), the personal computer (3
7) The video signal based on the data from the menu ROM (9a) is supplied to the selection display device (35) from the display device (35a).
The menu screen is displayed. Then, by selecting a game by moving the cursor on the display screen with the cursor down key (35l) and the cursor up key (35m), and pressing the enter key (35n), the game ROM selected from the personal computer (37) is selected. The video signal and the audio signal based on the data from (9b) to (9h) are supplied to the selection display device (35), the game screen is displayed on the display device (35a), and the audio output terminal (35b) A game audio signal is output.

In FIG. 2, (35p) is a stewardess call key, (35q) is a reading light key, and (35r) is a volume adjustment volume.

Further, based on the control data SC ₁ and SC ₂ extracted by the CADA decoder (36), the CPU in the CADA decoder (36)
(Not shown) controls the selection display device (35) and the like. For example, on the basis of the control data SC _1, override key in the control device of the transmitting side (5) (5
When d) is pressed to turn on the override,
The tuner (33) is set to the receiving state of the channel of the output frequency band of the modulator (11a), and is output to the output terminal V of the video tape recorder (1a) to the display device (35a) of the selection display device (35). An image of a video signal is displayed, and an audio signal output to an output terminal A of the video tape recorder (1a) is obtained at an audio output terminal (35b). Further, on the basis of the control data SC _1, when the announcement key (5c) is an announcement on pressed control the transmitting device (5) includes a tuner (33) of the output frequency band of the modulator (11a) The channel is in the receiving state, and the microphone (5a) is connected to the audio output terminal (35b).
Is obtained. in this case,
The video signal is muted so that the screen is not displayed on the display device. In these cases, the volume is set to be constant, for example.

Further, when the CADA encoder (6) or (7) does not function, the control data SC ₁ is done as well to obtain the time of overriding on, it is forced to the reception state of the same manner as in the even override ON at this time You.

If such control is performed during the game, the execution of the personal computer (37) is temporarily stopped.

When the override key (5d) and the announcement key (5c) are pressed again to turn off the override and the announcement, the above-described control is canceled and the original state is automatically restored. In this case, the execution of the personal computer (37) is also resumed, and the game can be continued. When the reception state is forcibly controlled as described above, the channel indicator (35h)
Indicates that the state is different from the normal state. In this case, a dedicated display may be provided.

Further, when the control data SC ₂ is used to control the brightness of the display device, is controlled the brightness of the display device (35a), it is automatically brightness according to the brightness of the room. Further, when the control data SC ₂ is a request for the data of the terminal device, data indicating the state of the key operation of selecting the display device from the CPU (35) of the CADA decoder (36) (e.g., a television selection key (35f) , Music selection key (35
g), the menu display key (35k) is pressed, and which channel is selected when the TV selection key (35f) and music selection key (35g) are pressed, the menu display key (35k) is Data on which game is selected when pressed),
Data indicating the state of the seat belt, reclining and the like detected by the sensor (39) is generated. This data is supplied to the transmitter (38) and the modulators (11a) to (11g)
And then supplied to the leaky cable (21) via the splitter (32) and the antenna (31). Then, this data is supplied from the leaky cable (21) to the transmitting-side CADA encoder (6) via the duplexer (13), and the CADA encoder (6)
The data is further supplied to the master controller (8), and is used for, for example, statistics of audience rating, use check, and the like.

When the stewardess call key (35p) of the selection display device (35) is pressed, control data is generated from the CPU of the CADA decoder (36). This data is supplied to a transmitter (38), modulated, and then supplied to a leaky cable (21) via a splitter (32) and an antenna (31). This data is sent from the leaky cable (21) via the duplexer (13) to the CADA encoder (6) on the transmission side.
Supplied to The switch box (40) is controlled by a CPU (not shown) in the CADA encoder (6) based on this data, and the corresponding steward desk lamp (41) emits light. When the reading light key (35q) of the selection display device (35) is pressed, control data is generated from the CPU of the CADA decoder (36). This data is supplied to a transmitter (38), modulated, and then supplied to a leaky cable (21) via a duplexer (32) and an antenna (31). Then, this data is supplied from the leaky cable (21) to the CADA encoder (6) on the transmission side via the duplexer (13). Based on this data, the switch box (40) is controlled by the CPU in the CADA encoder (6), and the corresponding reading light (4
2) is made to emit light.

As shown by the broken line, when the keyboard (43) is connected to the game terminal (35d), the CADA decoder (36)
Control data is generated by the CPU. This data is supplied to the transmitter (38), modulated, and then split by the splitter (3).
2) and a leaky cable (2
Supplied to 1). The data is supplied from the leaky cable (21) to the CADA encoder (6) via the duplexer (13), and is supplied from the CADA encoder (6) to the master controller (8). When this data is supplied, the software data of the word processor is sent from the master controller (8) to the CADA encoder (6),
The signal (7) is supplied to the terminal device (30) via the leaky cable (21) as a frequency multiplexed signal, and is taken into the personal computer (37). In this state, when the user operates the keyboard (43), sentences and the like are recorded in the memory (RAM) of the personal computer (37). In this case, the created text and the like are displayed on the display device (35a), and the user can correct the text and the like while looking at the display screen. And the keyboard (43)
When the termination operation is performed, the data (ASCII code) such as sentences is supplied from the memory of the personal computer (37) to the transmitter (38) via the CADA decoder (36), modulated, and then separated. (32) and antenna (31)
To the leaky cable (21). This data is supplied from the leaky cable (21) to the CADA encoder (6) via the duplexer (13).
Master controller (8) from CADA encoder (6)
Supplied to The data such as text is supplied to a disk drive (44) and recorded on, for example, a floppy disk, or the data such as text is supplied to a printer (45) to print out the text or the like, or the data such as text. Is transmitted to the outside via the communication device (46). Which one of these is selected is determined, for example, by operating the keyboard (43) of the user.
Supplied to Note that the software data of the word processor may be written in advance in the ROM of the personal computer (37) and used. Further, the floppy disk or the printed paper printed out in this way is received, for example, when the user gets off the airplane.

This example is configured as described above, and video signals output from the video tape recorders (1a) to (1d), the tuner (2), and the still picture reproducing device (3), and the video tape recorders (1a) to (1d) ), A time-division multiplexed CADA encoder (6) for audio signals output from a tuner (2), a still picture reproducer (3), an audio reproducer (4a), (4b),
The output signals S _CA1 and S _{CA2 of} (7) are the modulators (11a) to
The signal is modulated by (11g) and added to obtain a frequency multiplexed signal _SMF . Then, the frequency multiplexed signal S _MF is transmitted is supplied to the receiving side in the leaky cable (21). And
In the receiving-side terminal apparatus (30), a plurality of video signals are transmitted as frequency multiplexed signal S _MF, may select the desired one by controlling the selection display device from the audio signal or the like (35).

Also, data indicating that the reading light key (35q) and the stewardess call key (35p) are pressed from the terminal device (30) are modulated by the transmitter (38), and then the splitter (32) and the antenna (31). ) To the leaky cable (21). Then, this data is supplied from the leaky cable (21) to the CADA encoder (6) via the duplexer (13). And this data is stored in CADA encoder (6).
The light is supplied to the CPU to control the light emission of the reading light (42) and the stewardess call light (41).

Further, the control data SC ₂ requesting data of the terminal device from the master controller (8) is CADA encoder with audio signal (6), multiplexed with (7), via a leaky cable (21) of the receiving terminal It is supplied to the device (30). Then, indicating the state of the seat belt, reclining or the like which is detected by the data indicating the state of key operation of selecting the display device from the CPU of the CADA data (36) in accordance with the control data SC ₂ (35), the sensor (39) Data is generated. This data is then sent to the transmitter (3
Demultiplexer (32) and antenna (31) after modulated in 8)
To the leaky cable (21). This data is supplied from the leaky cable (21) to the CADA encoder (6) via the duplexer (13).
Master controller (8) from CADA encoder (6)
And is used to obtain statistics of audience rating.

As described above, according to the present example, a plurality of video signals, audio signals, and the like are frequency-multiplexed on the transmitting side, and leaky cables (2
The data from the CADA data (36) of the receiving terminal device (30) is supplied to the transmitting device via the leaky cable (21) while being supplied to the receiving terminal device (30) via 1). With such a configuration, the apparatus can be simplified. Further, according to this example, since the audio signal is transmitted as a digital signal by the CADA encoders (6) and (7), the terminal device (30) on the receiving side can listen to music with good sound quality. . According to this embodiment, in accordance with the control data SC ₂ transmitted from the master controller of the transmission side (8), data indicating the state of the terminal in the master controller (8) of the transmission side from the terminal device (30) Since the data is transmitted and used, the usability of the transmitting user is improved.

G ₃ Description of Another Embodiment Next, FIG. 4 shows another embodiment of the present invention, in which data indicating the state of a plurality of terminal devices (30) can be individually requested. It is. In FIG. 4, portions corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, for example, an individual address signal generator (51) is provided in the CADA encoder (6), and under the control of the master controller (8), a terminal device (30) to request data from this generator (51). ) Is generated. Then, the address signal is multiplexed with the control data SC ₂ leaky cable (2
It is supplied to 1) and transmitted.

In the CADA data (36) of the terminal device (30),
An address signal is extracted from signals S _CA1 and S _CA2 supplied from the CADA tuner (34). This CADA decoder (36)
The address signal taken out by the terminal is supplied to a comparator (52), and is stored in an address ROM (5) provided in each terminal device (30).
It is compared with the address signal corresponding to each terminal device (30) from 3), and the CPU of the CADA decoder (36) is controlled by the output signal of the comparator (52). And in this case, CADA
Address signal and address extracted by decoder (36)
Only when the address signal from the ROM (53) matches,
C of CADA decoder (36) according to control data SC ₂
Data or the like indicating the key operation of the selection display device (35) is generated from the PU, and transmitted to the transmission side as described above.

 Other configurations are the same as those in the example of FIG.

As described above, in this example, data indicating the state is generated only from the terminal device (30) corresponding to the address signal transmitted from the transmitting side and transmitted to the transmitting side. In this case, if the individual address signal transmitted from the transmitting side is changed with time, different terminal devices (3
Data indicating the state of 0) can be obtained. As described above, according to this example, the same operation and effect as those of the example of FIG. 1 can be obtained, and the transmitting side can individually request data indicating the state from a plurality of terminal devices (30). There are benefits that can be done.

In the above-described embodiment, the present invention is applied to an information transmission device in an aircraft. However, the present invention can be similarly applied to an information transmission device in a vehicle such as a train or a bus, or in a theater or a stadium. In the above embodiment, the terminal device (30) is provided on the back side of the seat. However, the terminal device (30) may be arranged near the seat, for example, on an armrest, a table attached to the seat, or the like.

H Effects of the Invention According to the present invention described above, a plurality of video signals, audio signals, and the like are multiplexed and transmitted by a single signal transmission means, so that the wiring is simplified and the apparatus is simplified. Can be. In addition, since the data indicating the state of the terminal device on the receiving side is transmitted to the transmitting side via the above-described single signal transmitting means in accordance with the control data transmitted from the transmitting side and can be used, The usability of the user can be improved. Therefore, it is suitable for application to information transmission devices in vehicles such as aircraft, trains and buses, or in theaters and stadiums.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIGS. 2 and 3 are diagrams for explaining the embodiment, and FIG. 4 is a block diagram showing another embodiment of the present invention. (1a) to (1d) are video tape recorders, (2) is a TV tuner, (3) is a still picture player, (4a) and (4a)
b) is a sound reproducer, (5) is a control device, (6)
And (7) are CADA encoders, (8) is a master controller, (9a) to (9h) are ROMs, (11a) to (11g) are modulators, (12) is adders, (13) and (32) Is a duplexer,
(21) is a leaky cable, (30) is a terminal device, (31)
Is an antenna, (33) is a TV tuner, (34) is a CADA tuner, (35) is a selection display device, (35p) is a stewardess call key, (35q) is a reading light key, and (36) is CADA
A decoder, (37) is a personal computer, and (38) is a transmitter.

Claims (1)

(57) [Claims] An information transmission device in a vehicle, comprising: a central control device; a terminal device provided for each passenger seat; and a bidirectional signal transmission means for connecting the central control device and the terminal device. Wherein the central control unit includes a plurality of video signal sources, a plurality of audio signal sources, a storage unit storing a plurality of game data, an audio signal from the audio signal source, and Time-division multiplexing means for time-division multiplexing game data and control data; frequency multiplexing for frequency-multiplexing a video signal from the video signal source and an output signal of the time-division multiplexing means and transmitting the multiplexed signal to the bidirectional signal transmission means Selecting means for selecting a desired video signal, audio signal, or game data from the frequency multiplexed signal transmitted by the bidirectional transmitting means, The video signal and the audio signal selected by the selection means,
Alternatively, a video device and a voice generating device to which a video signal and a voice signal generated based on the selected game data are supplied, a separating unit that separates the control data from the frequency multiplexed signal, A data generating means for generating data indicating a selection state of the selecting means according to the control data; and an output terminal connected to the bidirectional signal transmitting means for outputting a signal supplied to the selecting means. And a distributor having a terminal to which data from the data generating means is input.