JPS63257391A - Information transmitter - Google Patents

Abstract

PURPOSE:To simplify the titled transmitter and to make inexpensive by sending plural video signals and audio signals or the like through a single signal trans mission means while subjecting them to frequency multiplexing and sending a message override to a terminal equipment as a still picture. CONSTITUTION:Plural video signals and audio signals or the like are multiplexed by transmitters 11a-11g, 12 and fed to plural terminal equipments 30 through a signal transmission means 21. Thus, each terminal equipment 30 can utilize optional video signal or audio signal selectively from the multiplexed signal. Moreover, a still picture video signal from an override still picture reproducer la' is selected and multiplexed with other video signal and audio signal. Then a character pattern representing a message is displayed in each terminal equip ment 30. Thus, the device is simplified easily without causing complicated device or cost-up in the application of message override.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem (Fig. 1) F. Effect G. Embodiment G1 Explanation of transmitting side G2 Receiving side Description H Effect of the Invention A Industrial Field of Application The present invention provides a method for transmitting a plurality of video signals to a video display device, an audio generator, etc. individually provided in or near passenger seats of an airplane, train, bus, etc., for example. The present invention relates to an information transmission device suitable for use in transmitting audio signals and the like in parallel.

B. Summary of the invention In the present invention, a plurality of video signals are transmitted from the transmitting side to the receiving side.

In an information transmission device that transmits audio signals etc. in parallel,
By frequency multiplexing multiple video signals, audio signals, etc. and transmitting them using a single signal transmission means, and by sending the menu overwrite as a still image to the terminal device, the device can be simplified and made cheaper. This is what we aim to do.

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

D. Problems to be Solved by the Invention In this conventional device, multiple video signals are transmitted to each video display using independent transmission lines, and many transmission lines are required. It is.

Therefore, there is a problem that the wiring becomes complicated and the device becomes complicated.

In view of these points, the present invention aims at simplifying the device and also enables message override to be easily performed without complicating the device or increasing cost.

E Means for Solving Problems The present invention provides transmitting devices (lla) to (Ilg) (12) that multiplex and transmit video signals from a plurality of video signal sources and audio signals from a plurality of audio signal sources. ) and a plurality of terminal devices (30) to which the multiplexed signal SMF from the transmitting device is supplied through a single signal transmission means (21).
An information transmission device consisting of an override still image playback device (la') and an override video playback device (1a) are provided as video signal sources, and at the time of override, the still image playback device (la') and the video Only the video signal from one of the playback devices (la) is selected, multiplexed and transmitted by the transmitters (lla) to (Ilg) (12).

F Function In the above configuration, a plurality of video signals, audio signals, etc. are multiplexed by the transmitting devices (lla) to (l1g) (12), and are supplied to the plurality of terminal devices (30) through the signal transmission means (21). , each terminal device (30) can select and use any video signal, audio signal, etc. from the multiplexed signal. In addition, a still image playback device for override (la'
) is selected and multiplexed with other video signals, audio signals, etc., each terminal device (30
) can display a text screen indicating the message.

G. Example Hereinafter, an example of the present invention will be described with reference to FIG. This example is a video signal inside an aircraft.

This is applied to the transmission of audio signals, etc.

G1 Description of the transmitting side In FIG. 1, (Ia) to (ld) are video tape recorders provided on the transmitting side, such as in the crew cabin. The video tape recorder (la) is for video override, and is loaded with a cassette tape that records information such as how to put on a life jacket. Also, a videotape recorder (
1b) to (ld) are loaded with cassette tapes on which movies are recorded.

These video tape recorders (la) to (1d) include
A terminal V to which a reproduced video signal is output, and terminals R and A to which a reproduced audio signal is output are provided.

These video tape recorders (1a) to (1d) are bilingual, terminals R and R are output terminals for the left audio signal and right audio signal in the language of the first country, respectively, and terminal A is the output terminal for the left audio signal and right audio signal in the language of the first country. This is an output terminal for monaural audio signals in the language of the second country.

Further, (Ia') is a still image reproducing device such as a CD ROM reproducing device, a small computer, a disk reproducing device, etc., and is for message override. This still image reproducing device (la') is provided with a terminal (2) to which a reproduced video signal for a still screen indicating a message is output. In this case, the message can be freely changed by replacing the software or by rewriting the data in the memory. Furthermore, for example, in the case of a small computer, the message can be changed by supplying character data from a master controller, which will be described later.

Further, (2) is a television tuner, and this television tuner (2) is provided with a terminal (2) to which a video signal is output, and a terminal (R) to which an audio signal is output. Terminals R and R are output terminals for the left audio signal and right audio signal, respectively.

Further, (3) is a still image reproducing device, which is adapted to reproduce CD ROMs and the like on which maps, airport guide maps, etc. are recorded. This still playback device (3) is provided with a terminal V to which a still image video signal is output, and a terminal A to which an audio signal is output.

Further, (4a) and (4b) are audio playback machines each equipped with three compact disc players (CD players) and three tape recorders, and these sound playback machines (4B
) and (4b) are provided with six pairs of terminals R to which audio signals are output, respectively.

Terminals R and R are output terminals for the left audio signal and right audio signal, respectively.

Further, (5) is a control device, (5a) is a microphone, (5b) is a volume that adjusts the level of the audio signal from the microphone (5a), (5C) is an announce key, and (5d1) is a message override. key, (5d2) is the video override key, (5e) ~
(5g) are video tape recorders (lb) to (1d), respectively.
) is a Bose key to put the cursor into a pause state.

Video signals obtained at terminals (1) and audio signals obtained at terminals R and A of the video tape recorders (1a) and (lb) are respectively supplied to a control device (5). Also,
A video signal obtained at terminal (2) of the still image player (la') is supplied to a control device (5). The control device (5) is provided with a video signal output terminal ■ and an audio signal output terminal R, A, and these output terminals ■
A video tape recorder (l
In b), the video signal obtained at terminal V and the audio signal obtained at terminals R and A are output. However, when pressing the video override F-1-- (5d2) to turn on the video override, the output terminals ■ and R and A of the control device (5) are connected to the video tape recorder (
The video signal and terminal obtained at terminal V of 1a).

The audio signals obtained at R and A are output. Furthermore, when the message override key (5ds) is pressed to turn on the message override, the output terminal V of the control device (5) is connected to the still image player (Ia').
The video signal obtained is output to the terminal (2), and no audio signal is output to the output terminals R and A. Further, when the announce key (5C) is pressed to turn on the announcement, an audio signal from the microphone (5a) is output to the output terminal A of the control device (5).

Further, (6) and (7) are CAIIA encoders used in a conventionally well-known cable digital audio/data transmission system (CA system).

The CAD^ system, for example, is a system that time-division multiplexes multiple digital audio signals and transmits them using the band (6MHz) of one vacant CATV TV channel.
This is a system that can efficiently transmit music, etc. without sacrificing sound quality. CADA encoder (6) and (7)
is configured with an A/D converter and a shift register,
Time division multiplexing is performed by converting multiple audio signals into digital signals using an A/D converter, inputting them in parallel to predetermined positions of a shift register, and outputting them serially at high speed from this shift register. configured so that Note that it is possible to multiplex not only digital audio (but also control data and data for computer software).

Output terminal of the above-mentioned control device (5), l
Ma.

The audio signal obtained at A is supplied to an encoder (6). In addition, the audio signals obtained at the output terminals R and A of the video tape recorders (LC) and (LD) are output to the encoder (
6). Furthermore, the audio signals obtained at the output terminals R of the tuner (2) and the output terminal A of the still image player (3) are supplied to an encoder (6).

In addition, 6 pairs of output terminals of audio reproduction tJl (4a), R
The audio signals obtained at R and three pairs of output terminals of the audio player (4b) are supplied to the encoders (6) and (7) via the control device (5).

Also, the override key (5) of the control device (5)
dx), (5dz), announce key (5
c).

When the pause keys (5e) to (5g) are pressed, the control device (5) generates control data SC1 having contents corresponding to the pressed keys, and this control data SC1 is supplied to the encoder (6). .

The encoder (61) is provided with output terminals A to E from which a pause control signal is output in accordance with the control data SCI, and the pause control signals obtained at these output terminals A to E are used to control the video tape recorder (lb), respectively. ~(l
d) The audio players (4a) and (4b) are controlled. That is, the override key (5dt).

When (5d2) and announce key (5C) are pressed, a pause control signal is output to output terminals A-E, and video tape recorders (lb) to (Id), audio players (4th) and (4b) All are considered to be in a pause state. Also, when the Bose keys (5e) to (5g) are pressed,
Pause control signals are output to output terminals A to C, respectively, and the video tape recorders (1b) to (1d) are placed in a pause state, respectively.

Also, (8) is a master controller [J-ra] consisting of a computer that performs in-flight management, and this master controller (8) generates control data SC2 that controls the terminal device on the receiving side. It is supplied to an encoder (6).

This control data SC2 is, for example, data for controlling the brightness of the display device of the terminal device, data for requesting data indicating the status of the terminal device, and the like.

In addition, (9a) is a ROM in which menu data is written.
, (9b) to (9h) are ROMs in which different game data is written. This ROM (9a) to (9h)
The computer software I/ware data SD read out is supplied to a signal processing circuit (10), and after addition of an error correction code, etc., is supplied to an encoder (7).

The control data SC1 and SC2 are also supplied from the encoder (6) to the encoder (7).

Further, at the output terminal O of the encoder (6), a signal Sc^1 obtained by time division multiplexing of the digitally converted signals of the plurality of supplied audio signals and the control data SCz, SC2 is obtained. The signal 5CAI is connected to the modulator (I
AMf
It is in i key. Further, at the output terminal 0 of the encoder (7), a signal Sc^2 obtained by digitally converting the plurality of supplied audio signals, time-division multiplexing of control data SCI, SC2, and computer software data SD is obtained. This signal Sc^2 is sent to the modulator (l1g
) and AM modulated using the VSB method.

Furthermore, the video signal obtained at the output terminal (■) of the control device (5) is supplied to the modulator (lla), and the audio signal obtained at the output terminal A of the control device (5) is supplied to the modulator (lla). be done. In the modulator (lla), the audio signal is FM modulated and frequency multiplexed with the video signal to make it similar to a normal television signal, and then the VS
AM variation is used in B method.

Also, video tape recorder (LC), (Id)
.

Output terminal for tuner (2) and still player (3)■
The video signals obtained are transmitted through modulators (llb) to (li
e) and is AM modulated using the VSB method.

Here, the modulators (lla) to (l1g) are configured to sequentially modulate frequency bands every two channels to prevent cross-modulation, for example, on 60 or more television broadcast channels.

Further, the output signals of the modulators (lla) to (Ilg) are supplied to an adder (12) and frequency-multiplexed. The frequency-multiplexed signal SMF from the adder (12) is supplied via a duplexer (13) to one end of a leaky cable (21) constituting a bidirectional signal transmission means. The other end of this leaky cable (21) is connected to a terminating resistor (22) for termination. This leaky cable (21) is, for example, a coaxial cable with a spiral cutout around it to increase the amount of signal leakage.

Explanation of G2 Receiving Side Further, (30) is a terminal device provided individually in the passenger seat of the aircraft, and only one terminal device is shown in the figure. In this terminal device (30), (31) is an antenna for capturing the frequency multiplexed signal SMP leaking from the leaky cable (21). The frequency multiplexed signal SMF captured by this antenna (31) is sent to a TV tuner (33) and a CAIIA tuner (34) via a demultiplexer 13 (32).
supplied to The tuner (33) is a modulator (lla)
The tuner (34) is configured to selectively receive channels in the output frequency band of ~(lie), and the tuner (34) is configured to selectively receive channels in the output frequency band of the modulators (Iff) and (Ilg). Channel selection in these tuners (33) and (34) is controlled by a selection display device (35).

Further, the video signal and the audio signal outputted from the tuner (33) are supplied to the selection display device (35), and the time division multiplexed signal 5CA1 outputted from the tuner (34).
Alternatively, 5CA2 is supplied to the CADA decoder (36). The CADA decoder (36) is configured to operate almost inversely to the CADA encoder (6) and (71) described above, and outputs the control data SC1, SC2 and the selection display device (35) from the time division multiplexed signal 5CAI or Sc^2. ), the desired audio signal and data for computer software are extracted.That is, the CADA decoder (36) is configured with a shift register and a D/A converter, and outputs the time division multiplexed signal Sc^1 or Sc^
2 is serially input to a shift register, and control data SC1, SC is input from a predetermined position of this shift register.
2 are taken out in parallel, and the selection display device (35
), desired audio signals and computer software data SD are taken out in parallel from predetermined positions of the shift register.

In this case, the audio signal is converted into an analog signal via a D/A converter. This D/A converter has two
There are 21 floors in total! j is enough. This CA
The audio signal extracted by the DA decoder (36) is supplied to a selection display device (35). Further, the computer software data SO extracted by the CADA decoder (36) is supplied to the personal computer (37) and written into the RAM.

Further, FIG. 2 shows an example of the configuration of the panel surface of the selection display device (35), and this panel surface is arranged on the back of the passenger seat as shown in FIG. 3.

In Fig. 2, (35a) is a display device consisting of a flat cathode ray tube, liquid crystal display, etc., (35b) is an audio output terminal to which headphones (35c) are connected, and (35d) is an audio output terminal to which headphones (35c) are connected.
is a joystick (35e) etc. for games (1st
(see figure) is the game terminal to which it is connected.

Also, (35f) is the TV selection key, (35g) is the music selection key, (35h) is the channel display, (35g) is the music selection key, (35h) is the channel display,
51) 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 (351).
, channel up key (35j) in sequence, the television channels can be changed in sequence. That is, the reception channel at the television tuner (33) and the audio signal output from the CADA decoder (36) are changed, and the display device (35a) displays the video tape recorder (lb) to
(ld), the tuner (2), and the screen of the video signal output from the still image player (3) are sequentially displayed, and
A corresponding audio signal is output to the audio output terminal (35b). Here, when the audio signal is in two languages, two channels are assigned to one video signal screen, the first channel is the audio signal in the language of the first country, and the second channel is the audio signal in the language of the second country. An audio signal in this language is output. Furthermore, the music channel can be changed in sequence by pressing the music selection key (35g), then pressing the channel down key (35i) and channel up key (35j) in sequence. That is, the audio signal output from the CADA decoder (36) is changed, and the audio signal output terminal (
35b) is an audio player (4a).

The audio signals output from (4b) are sequentially output.

Further, (35k) is a menu display key, (3!M) is a cursor down key, (3511) is a cursor up key, and (35n) is an enter key. In this case, by pressing the menu display key (35k), a video signal based on data from the menu ROM (9a) is supplied from the personal computer (37) to the selection display device (35), and the menu is displayed on the display device (35a). The screen will be displayed. Then, select the game by moving the cursor on the display screen using the cursor down key (3!M) and cursor up key (35m), then press the enter key (35n).
By pressing , the video and audio signals based on the data from the game ROMs (9b) to (9h) selected by the personal computer (37) are displayed on the selection display device (3).
5), the game screen is displayed on the display device (35a), and the game audio signal is output to the audio output terminal (35b).

Also, in Figure 2, (35p) is the stewardess call key, (35q,) is the reading light key, (35r)
is a volume for adjusting the volume.

Further, the selection display device (35) and the like are controlled by a CPU (not shown) in the CADA decoder (36) based on control data SC1 and SC2 taken out by the CADA decoder (36). For example, based on the control data SC1, the transmitting side control device (5
) When the override keys (5dx) and (5d2) of The display devices (35a) each display still image playback tJu(la').
And an image of the video signal output to the output terminal V of the video tape recorder (1a) is displayed. That is, when the override key (5d1) is pressed, a still image showing the message is displayed, while the override key (5d2) is pressed.
) is pressed, the video is displayed. Also, when the override key (5d2) is pressed, the audio output terminal (35b) is connected to the video tape recorder (1a).
The audio signal output to the output terminal A of the is obtained.

Based on the control data SC1, when the announce key (5c) of the transmitting side control device (5) is pressed to turn on the announcement, the tuner (3
3) is set to receive the channel in the output frequency band of the transducer (lla), and the audio output terminal (35b) is configured to receive an audio signal from the microphone (5a). In this case, the video signal is muted so that no screen is displayed on the display device. Further, in these cases, the volume is kept constant, for example.

Further, when the CADA encoder (6) or (7) does not function, the control data SCs is obtained in the same state as when the message override is on or the video override is on, and at this time, the control data SCs is obtained in the same state as when the override is on. It is said that

When a game is being played, execution of the personal computer (37) is temporarily stopped when controlled in this manner.

In addition, the override key (5d1), (5d2
) When the announce key (5c) is pressed again to turn override off and announcement off, the above-mentioned control is canceled and the original state is automatically restored. In this case, execution of the personal computer (37) is resumed so that the game can continue to be played.

Further, when the reception state is forcibly controlled such as when the override is turned on or when the announcement is turned on, the channel display (35h) displays something different from the normal state. In this case, a dedicated display may be provided.

Furthermore, the brightness of the display device (35a) is controlled based on the control data SC2, and the brightness is automatically adjusted to match the brightness of the room. In addition, control data SC
2 requests data, data indicating the state of the selected display device (35) is sent from the CPU of the CADA decoder (36), and data indicating the state of the seat belt, reclining, etc. detected by the sensor (39) is sent. generated. This data is fed to the transmitter (38)
After being modulated to a frequency other than the output frequency band of the modulators (lla) to (Ilg), the signal is supplied to the leaky cable (21) via the duplexer (32) and the antenna (31). Then, this data is supplied from the key cable (21) to the transmitting side CADA encoder (6) via the duplexer (13), and from this CADA encoder (6) is supplied to the master controller (8) for use. be done.

Also, when the steward desk call key (35p) of the selection display device (35) is pressed, the CADA decoder (36)
Control data is generated by the CPU. 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). This data is then supplied from the leaky cable (21) via the duplexer (13) to the CADA encoder (6) on the transmitting side. and,
Based on this data, the CP in the CADA encoder (6)
U (not shown) controls the switch box (40) so that the corresponding stewardess call light (41) is illuminated. In addition, a selection display device (35)
Similarly, when the reading light key (35q) is pressed, press C.
The control data generated by the ADA decoder (36) is supplied to the CAD^ encoder (6), and this CAD
The switch box (40) is controlled by the CPU in the A encoder (6), and the corresponding reading light (42) is made to emit light.

Further, as shown by the broken line, when a keyboard (43) is connected to the game terminal (35d), control data is generated by 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).

This data is then supplied from the leaky cable (21) to the CADA encoder (6) via the duplexer (13), and from this CADA encoder (6) to the master controller (8). When this data is supplied, the word processor software data is transferred from the master controller (8) to the CADA encoder (6), (7).
), is supplied as a frequency multiplexed signal to the terminal device (30) via the leaky cable (21), 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 (for example, RAM') of the personal computer (37). In this case, the display device (
In 35a), the meaning of the sentence, etc., created is displayed, and the user can make corrections to the sentence, etc. while looking at the display screen. When a termination operation is performed using the keyboard (43), data such as text (ASCII code) is transferred from the memory of the personal computer (37) to the CADA decoder (
36) to the transmitter (3 days), where it is modulated, and then supplied to the leaky cable (21) via the duplexer (32) and antenna (31). is supplied to a CADA encoder (6) via a waveform generator (13), and this CADA encoder (6)
is supplied to the master controller (8). Then, the data such as text is supplied to the disk drive (44) and recorded on, for example, a floppy disk, or the data such as text is supplied to the printer (45) and the text etc. is printed out, or the data such as text is is transmitted to the outside via the communication device (46).

The selection of one of these is made, for example, by the user's operation on the keyboard (43), and the selection data is supplied to the master controller (8) together with data such as sentences. Note that the software data for the word processor may be written in the ROM of the personal computer (37) in advance and used.Furthermore, the floppy disk or printed paper on which the data is recorded in this way may be used, for example. Uke is made to take when a person gets off the plane.

This example is configured as described above, and has a still image playback device (la'
), video tape recorders (la) to (ld).

Video signals output from the tuner (2), still image player (3), and video tape recorders (1a) to (ld)
.

Tuner (2), still image player (3), audio player (
4a).

Output signal 5CA1 of CADA encoder (61, (7)) time-division multiplexed with audio signals etc. output from (4b)
．． 5CA2 are modulators (lla) to (l1g), respectively.
) and are added to form a frequency multiplexed signal SHP. This frequency multiplexed signal SMF is then supplied to the leaky cable (21) and transmitted to the receiving side. Then, in the terminal device (30) on the receiving side, the frequency multiplexed signal S
A desired one can be selected and viewed from a plurality of video signals, audio signals, etc. transmitted as MF by controlling the selection display device (35).

In addition, the message override key (5dl) and video override key (5dl) of the control device (5) are also
5th) to turn on the still image player (I).
a') and video tape recorder (1a) output terminal■
The video signal obtained is outputted from the control device (5), supplied to the modulator (lla), frequency multiplexed, supplied to the leaky cable (21), and transmitted to the receiving side. Then, the display device (
35a), a still image and a moving image each showing a message are forcibly displayed.

In this way, according to this example, a plurality of video signals, audio signals, etc. are frequency multiplexed on the transmitting side, and the leaky cable (21
) is configured to be supplied to the receiving side via
Only one signal transmission line is required, making wiring simple and simplifying the device.

Furthermore, according to this example, the message override is transmitted to the terminal device as a still image, which makes the circuit simpler and cheaper than, for example, transmitting it as character data from the master controller (8). be able to. That is, according to what is transmitted as character data from the master controller (8), this character data is taken into the memory of the personal computer (37) of each terminal device (30), and game data is also taken into this memory. Therefore, when a message override is performed while a game is being played, the game data (program) is inconveniently destroyed. In order to avoid this problem, a separate memory for capturing the message override may be provided, but since this is required for each terminal device, the circuit becomes complicated and expensive.

According to this example, such inconvenience is eliminated.

Next, FIG. 4 shows another embodiment of the present invention, in which instead of providing a still image reproducing device as in the example of FIG.
The master controller (8) is provided with a terminal (2) to which a video signal for a still screen indicating a message is output, and the video signal obtained at this terminal (2) is supplied to the control device (5). It is clear that in this example as well, the same effects as in the example in FIG. 1 can be obtained.

Although the above-mentioned embodiment applies the present invention to an information transmission device inside an aircraft, it can be similarly applied to an information transmission device inside a vehicle such as a train or a bus, or inside a theater or stadium. Further, in the above embodiment, the terminal device (30) is provided on the back side of the seat, but it may also be provided near the seat, for example, on the armrest, on a table attached to the seat, or the like.

Effect of H invention According to the present invention described above, a plurality of video signals.

Since audio signals and the like are frequency-multiplexed and transmitted by a single signal transmission means, wiring is simple and the apparatus can be simplified. Furthermore, since the message override is sent as a still image to the terminal device, the circuit can be simpler and less expensive than when character data is sent to each terminal device. In addition, for those who do not play computer games, message override can be done without having to equip each terminal device with a computer.
Furthermore, it is possible to simplify the circuit and reduce the cost. Therefore, the present invention is suitable for use as an information transmission device in vehicles such as airplanes, trains, and buses, theaters, and stadiums.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIGS. 2 and 3 are diagrams for explaining the same, and FIG. 4 is a block diagram showing another embodiment of the present invention. (Ia) - (ld) are video tape recorders, (la
') is a still image player, (2) is a TV tuner, (3
) is a still image playback device, (4a) and (4b) are audio playback devices, (5) is a control device, (5d*) is a message override key, (5d2) is a video override key, (6) and (7) is a code to CAD 8e,
(8) is a master controller, (9a) to (9h) are ROMs, (lla) to (Ilg) are modulators, (12
) is an adder, (Step 3) and (32) are branchers, (21)
is a leaky cable, (30) is a terminal device, (31) is an antenna, (33) is a TV tuner, (34) is a CA
DA tuner, (35) is selection display device, (35p)
(35q) is a reading light key, (36) is a CADA decoder, (37) is a personal computer, and (38) is a transmitter.

Claims (1)

[Claims] A transmitting device that multiplexes and transmits video signals from a plurality of video signal sources and audio signals from a plurality of audio signal sources, and a method in which the multiplexed signals from the transmitting device are transmitted as a single signal. In an information transmission device comprising a plurality of terminal devices supplied through means, an override still image playback device and an override video playback device are provided as the video signal source, and at the time of override, the above-mentioned still image playback device and video playback device are provided. An information transmitting device characterized in that only a video signal from one of the above is selected, multiplexed by the transmitting device, and transmitted.