JPH02179140A - Information transmitter - Google Patents

Abstract

PURPOSE:To set an address automatically even in the absence of an incoming line by transmitting a command signal to the terminal equipment of a specific zone from a central control unit and bring the terminal equipment of the group into the state capable of fetching a zone address signal. CONSTITUTION:The transmitter is an equipment transmitting information from a central control unit 1 to a terminal equipment provided on a passenger seat for aircraft, a train or a bus or the like, the terminal equipment is segmented into plural zones A, B, C, a zone address is used for only a terminal equipment in a specific zone to enable sending the information from the central control unit 1. That is, a command signal is transmitted from the central control unit 1 to the terminal equipment of the specific zone and only the terminal equipment in the group is brought into the state capable of fetching the zone address signal. Then the zone address signal is transmitted and the terminal equipment fetches the zone address signal. Thus, the address is automatically set for each zone even in the comparatively simple system without an incoming line from the terminal equipment to the central control unit 1.

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. Conventional technology D. Problem to be solved by the invention E. Means for solving the problem F. Effect G. Example G, description of the central control device G.2 Description of the terminal device G.3 Address setting Description of operation at time H Effect of the invention A Industrial field of application The present invention is used for transmitting video signals etc. from a central control unit to a terminal device provided for each passenger seat of an aircraft, train, bus, etc. The present invention relates to a suitable information transmission device.

B. Summary of the Invention The present invention provides an information transmission device that transmits information from a central control device to a plurality of terminal devices provided for each passenger seat of an aircraft, train, bus, etc., which divides the terminal devices into a plurality of zones, If you enable the central controller to transmit information only to terminal devices in a specific zone by using zone addresses, the central controller can transmit command signals to the terminal devices in a specific zone and send only the terminal devices in this group. The device is set in a state where the zone address signal can be taken in, and then the zone address signal is transmitted and the zone address signal is taken in by this terminal device, so that the zone address can be automatically set with a simple configuration.

C. Prior Art For example, Japanese Unexamined Patent Publication No. 168794/1983 discloses that a video display is provided individually in the passenger seat of a vehicle such as an airplane. That is, video displays as terminal devices are individually installed in the passenger seats, and a plurality of video signals are transmitted in parallel from a central control unit to these video displays, and each video display side:
One of the signals is selected and displayed.

D. Problem to be Solved by the Invention By the way, the video display for each seat is individually assigned an address corresponding to the seat number.
It has been proposed to selectively transmit necessary signals only to desired video displays (terminal devices) by specifying addresses from the central control device.

In this case, each video display corresponding to each seat is provided with an address signal generator to which a different address is set, and addressing is done based on the address signal obtained from this address signal generator. In recent years, aircraft have tended to become larger, and for example, it was very time-consuming and inconvenient to set addresses in the address signal generator of the video display that corresponds to each seat on an aircraft with more than 500 seats. .

In order to solve this inconvenience, Ganto Motoyama previously proposed various types of information transmission devices in which address settings are automatically performed. For example, the central control unit supplies address signals to each terminal device in order using a predetermined method, and the terminal devices that have been assigned an address return an address setting completion signal to the central control unit, and the set address is controlled by the central control unit. This is to be confirmed using the device.

This address setting method is convenient because addresses are automatically assigned, but it requires an uplink from each terminal device to the central control device in order to confirm the set address, and from the central control device side to each terminal. There is an inconvenience that this method cannot be applied to a relatively simple system connected only through a so-called down line, which only transmits video signals and the like to devices.

In view of the above, an object of the present invention is to provide an information transmission device of this type in which address setting is automatically performed even when there is no uplink.

E. Means for Solving the Problems The information transmission device of the present invention divides a plurality of terminal devices (6a), (6b), etc. into a plurality of zones A, B, C, as shown in FIG. 1, for example. , in an information transmission device that allows the central control device (1) to transmit information only to terminal devices in a specific zone, the central control device (1) transmits information to the terminal devices (6a), (6b), etc. in the specific zone.・・・
The terminal device (6a) of this group transmits a command signal to
, (6b)... is placed in a state in which the zone address signal can be taken in, and then the zone address signal is transmitted from the central control unit (1), and the terminal device (6
The zone address signal is taken in in steps a), (6b), and so on.

F Function According to the present invention, each terminal device (
Addresses are set for each zone by simply supplying command signals and zone address signals to terminal devices (6a), (6b)...
The zone address is automatically set without transmitting a signal to the central control unit (1) from ・It can also be applied to transmission equipment without an uplink.

G. Embodiment Hereinafter, one embodiment of the information transmission device of the present invention will be described with reference to the accompanying drawings.

This example is applied to a transmission device that transmits video signals, audio signals, etc. in an aircraft.

G. Description of Central Control Unit First, the central control unit will be explained. In Figure 1, (1
1 indicates a central control device installed in a crew cabin, etc., and this central control device (1) is connected to four video tape recorders (
(hereinafter referred to as VTR). That is, the first tape cassette containing mainly entertainment programs such as movies is loaded.
, second and third VTRs (11), (12) and (
13) and an override VTR (14) loaded with a tape cassette recording instructions on how to put on a life jacket, etc.
Equipped with. In addition, there is a still image transmitter (15) that plays back still image recording media (CD ROM, etc.) containing maps, airport guide maps, etc., and a still image transmitter (15) that can receive regular television broadcasts while waiting at the airport. A TV tuner (16) that receives television broadcasts from a broadcasting satellite during flight, a video camera (17) installed in the cockpit that records takeoff and landing, and a microphone (8) for guiding passengers.
, a master controller (19) for in-flight management that controls each device such as playback control of each TR (11) to (14), and creates character information to be supplied to each terminal device, and this master controller ( A keyboard (20) is connected to the master controller (19) and instructs various operations to be described later.
9) and a monitor receiver a (21) for displaying the control state in step 9), the video output from each VTR, and the like. Such equipment (11) ~
(21) is connected to the system controller (10) of this central control device (1), and in response to operation commands from the keyboard (20), each controller is sent from the master controller (19) to the system controller (10). VTR (
11) to (14), a CD ROM drive device (15), a television tuner (16), and a video camera (17), and each VTR (11) to (14) uses this control signal to perform playback. video and audio signals are supplied to the CD ROM drive (15
) supplies video signals of still images, a television tuner (16) supplies television broadcast signals (video signals and audio signals), and a video camera (17) supplies photographed video signals. In addition, the master controller (
19) supplies time data, character information, etc. to the system controller (10).

Moreover, seven ROM cartridges can be installed in this central control device (1), and in the case of this example, seven game ROM cartridges (23a), (23b), each storing a different video game program.・” (23
g) Attach. And such ROM cartridges (
The computer program data read from 23a) to (23g) is supplied to a data transmitter (27), which will be described later.

Further, (24) indicates a floppy disk drive connected to the master controller (19), and data such as meal menus stored on the floppy disk attached to this floppy disk drive (24) is transferred to the master controller (19). ) to the system controller (work 0), and new data can be stored or stored data can be modified by operating the keyboard (20). During this storage operation or correction operation, data can be checked using a monitor receiver (21).

Further, (25) and (26) indicate audio playback machines each equipped with three compact disc players and three tape playback devices (six in total); these sound playback machines (25) and (26) are system By supplying control signals from the controller (10), six sets of stereo audio signals (i.e., 12 channels of audio signals) are simultaneously played from six units, and the six sets of reproduced stereo audio signals are transferred to the CAD, which will be described later.
The signal is supplied to the A encoder (28).

Further, (27) indicates a data transmitter, and by supplying a control signal from the system controller (10),
Data such as a video game program is continuously outputted from the ROM cartridges (23a) to (23g), and after predetermined processing is performed on the read data, the CADA encoder (28
).

(28) is a conventionally well-known cable digital audio/data transmission system (CADA system).
This is a heavily used CADA encoder. A CADA system, for example, time-division multiplexes multiple digital audio signals and transmits them using the band of one vacant CATV TV channel (5Mllz), which allows music etc. to be transmitted extremely efficiently without sacrificing sound quality. It is a system that can transmit data. The CADA encoder (28) is configured with an A/D converter and a shift register, converts a plurality of audio signals into digital signals with the A/D converter, and manually inputs the signals to predetermined positions of the shift register in parallel. At the same time, the shift register is configured to perform time division multiplexing by serially outputting signals at high speed. Note that not only digital audio but also various transmission data such as control data and computer program data are multiplexed.

Then, the above-mentioned audio signal and data such as text information such as a meal menu, video game program data, etc. supplied to the system controller (1O) are supplied to this CADA encoder (28), and the audio signal and data are The signal is multiplexed by division and output as a multiplexed signal SCa.

In this case, various data supplied from the master controller (19) mentioned above are transmitted using predetermined data bits in the multiplex signal SCA. The signal format of this multiplexed signal is explained below.
Patent application No. 58-210356 and Patent application No. 1709-1983
This is an improved signal format proposed by No. 25 and others.

That is, as shown in FIG. 4A, this multiplexed signal is a serial binary signal St consisting of a large number of superframes, one superframe consisting of 256 frames F1 to F256, and one frame of which As shown in FIG. 4B, is composed of 168 bits and has a period of 1/32kl+2. Each frame has, in order, an 8-pin synchronization code 5YNC, a 4-bit service bit SB, a 32-bit x 4 data packet PCTA-PCTD, and a 7-bit x 4 error correction bit ECC. .

In this case, the synchronization code S'/NC is set as superframe sync SS in the first frame F1 of the superframe, and as frame sync FS in the following <255 frames F2 to F256, as shown in FIG. 4A. , the super frame sync SS and the frame sync SS have different bit patterns.

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

Furthermore, the data packets PCTA-PCTO each consist of 32 bits and constitute four buckets (PCTA-PCTD) independently of each other. And this packet l-PCTA-PCTO
are 4 bits each with 8 bits as shown in Figure 4C.
Each of the channels M1 to M4 is a PCM signal obtained by sampling an audio signal (voice signal) at a frequency of 32 kHz.

Therefore, during an l frame, there are four packets PCT
Since there are A to PCTD and each bucket has four channels M and -M4, a total of 16 channels of audio signals can be transmitted simultaneously in a time-division manner using one signal SL.

In addition, data such as video game programs from the ROM cartridges (23a) to (23g) are made into bit-sequential time-division signals, and this signal is used as one of the 16 channel signals, and each program or When the data is sent out to the last bit, it is sent out again from the first bit.

Further, the error correction code ECC performs error correction on each of the 7 bits of each of the buckets PCT to PCTD.

Since the signal St has the above format, its transmission bit rate is 168 bits x 32 kHz, 5.4 Mbps, and 1/2 of that is the Nyquist frequency, so if the video signal has the bandwidth, the signal St can be transmitted.

Therefore, as mentioned above, the CADA encoder (28
) 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 B+ to B.

Then, as schematically shown in FIG. 5A, a continuous 77
If a set of frames is formed and the 77 frames are arranged vertically in frame units, the service bits will have a size of 77 bits (vertical) x 4 bits (horizontal).

Therefore, as shown in FIG. 5B, if the service bits SB are taken out in the vertical direction and the 77 bits are taken as one channel, then the 77 bits B will be used for the first channel CH.
Similarly, 77 bits Bz to B4 each form second to fourth channels CIINR to CHND.

Then, as shown in FIG. 5B, channels CHNA~
Each of CHND is sequentially divided into seven words WRDA to -RDG of 11 bits each, and as shown in FIG. 5C, the first bit of each word is 0°.

The start bit 5TRT of level is set, the following 8 bits are set as data bit DTBT, the next 1 bit is set as parity bit PRTV, and the last 1 bit is set as stop bit 5TOP of level '0°'.

And data bit DTBT, channel C
In each of IIN to CLLN0, there is one data bit DTB'r' per word, and there are seven words per 77 frames, so the data bit DTB'r' is
There are 7 T's (7 bytes) for every 77 frames, so there are 8 bytes of data bits (DTBT) for 4 channels as a whole.

Of this data bit 1-DTBT, the data bit DTBT of the second channel C11N B has a first byte with a predetermined bit pattern (
The header HDER (hexadecimal value "'AA") is taken, and the second hide is taken as the command CMD, which is used to identify up to 256 types of commands. Furthermore, the third and fourth bytes indicate the seat number (terminal device address).
and the fifth and sixth bytes are status information 5TT indicating data or parameters accompanying the command CMD.
The last byte is the error check code ECC.

Therefore, data pin 1- of this channel CHNB is
With DTBT, it is possible to specify a transmitting terminal device and further control predetermined operations.

In this case, in this example, each terminal device (6a), (6b)...
This makes it possible to transmit address setting commands.

That is, when setting this address, data bit DTBT
The command CMD is an address setting command, and the address ADR5 is an address number to be set. In this example, this address number is set as a common number for each zone within the cabin. That is, it is divided into three zones: a first class zone, a business class zone, and an economy class zone, and a terminal device (6a) in each zone,
(6b) The same address number is set for . . . to enable zone addressing.

This multiplexed signal SCA is then supplied to a modulator (29), modulated into a signal in a predetermined channel band, and output.

Additionally, the first
-Video signals from the third VTRs (11) to (13), the television tuner (16), and the video camera (17) are supplied to the modulator (29), respectively, and the signals in the band of each channel are Modulate and output. Further, the video signal from the override VTR (14) is transmitted to the first V i
' It is designed to modulate the signal of the same channel as the video signal from R(l l), and the override V T
' While playing R (14), the master controller (1
9), the first VTR (11) is put into a pause state.

Then, the multiplexed signal SCA and video signal of each channel outputted by this modulator (29) are supplied as a frequency-multiplexed transmission signal SMF to one end of a coaxial cable (2) stretched for each zone. .

In this example, the master controller (19) connects terminal devices (6a) and (6b) of each zone, which will be described later.
A binary signal for address setting can be sent for each zone, and this binary signal for each zone is supplied to the modulator (29) via the system controller (10). This binary signal is supplied from the coaxial cable (2) to one end of a signal line stretched in each zone in parallel with the coaxial cable (2).

Description of G2 Terminal Device Next, the configuration of the terminal side will be described. Central control unit (
The coaxial cables (2) drawn out from 2) for each zone A, B, and C are passed through separate amplifiers (31a), (31b), and (31c), respectively, as shown in Figures 1 and 2. and reach the bottom of the guest rooms in zones A, B, and C. In each zone A, B, and C, a distributor (32) distributes the coaxial cable (2) into a plurality of cables according to the arrangement of the seats. In this case, the signal line for transmitting the above-mentioned address setting binary signal is also connected to the amplifiers (31a) and (31b).
.

(31c) to the distributor (32) for amplification and distribution. Then, each distributed coaxial cable (
2) Turnouts (33a), (33b), (33c)”
are connected in series, and each branch switch (33a), (33b), (
33c) ”= terminal device of each seat (6a), (
6b), (6c), and so on.

In this case, the seats for each passenger are, for example, one set of seat unit 7 (9) with seats for three people (9a), (9b), (
9c) are provided, and these seat units (9) are arranged in a predetermined state inside the aircraft as described below. and,
Each seat (9a) of each seat unit y l (9),
(9b), (9c), terminal device (6a), (
6b), (6c) ``'' is provided. Three terminal devices (for example, (6a), (6b), and (6c)) provided in one set of seat units (9) receive transmission signals branched from the same branching device (for example, (33a)). receive.

This terminal device (6a), (6b), (6c)
= ” means each passenger seat (9a) as shown in Figure 2,
(9b), (9c), and although the details of only one terminal device (6a) are shown in FIG. 1, the same applies to the other terminal devices (6b), (6c), etc. It is the composition. This terminal device (6a) is connected to a turnout (3
The transmission signal S□ branched at 3a) is sent to the TV tuner (61
) and CADA tuner (62), and the TV tuner (61) selects a predetermined channel on which the video signal is transmitted among the multiple channels of signals sent from the central controller (1) to the leaky cable (2). is selected and demodulated based on channel selection information to be described later, and the demodulated video signal is supplied to a monitor receiver (63) to receive the video signal. You can also connect your personal computer (65) to a TV tuner (
61), figures such as maps and characters are displayed on this monitor image i (63).

Further, the CADA tuner (62) is connected to the central control unit (1).
) to the coaxial cable (2), demodulates the signal of the channel on which the multiplexed signal SCA, which is a multiplexed signal of an audio signal and data, is transmitted, and sends the demodulated signal to a CADA decoder (64). supply In addition, when the demodulated signal includes tuning information, this tuning information is
It is supplied to the V tuner (61). And this CADA
The decoder (64) extracts desired data (or audio signals) from the multiplexed signal SCA in response to the operation of an operation key (67) of the terminal device (6a), which will be described later, and transfers the extracted data to the personal computer (65). Or it is supplied to the terminal side controller (66). A memory (65a) is connected to this personal computer (65). Then, the operation key (67) is
6), and operation commands from the operation keys (67) are supplied to the controller (66).

The terminal side controller (66) is also connected to headphones (68) via terminals (66a) and (66b), respectively.
and a joystick (69) can be connected.

In addition, one ID unit (7a), (7b)... is installed for each set of seat units (9),
Each ID unit (7a), (7b) in each zone
. . . are connected in series by a signal line that transmits a binary signal for address setting. The connection order at this time is, for example, the brancher (33a), (33a) using the coaxial cable (2),
The connection order is the same as that of b) and (33c) -. Each of these ID units (7a), (7b)... memorizes the zone address set by the method described later, and each ID unit (7a), (7b)...... stores the zone address set by the method described later. ), (6b), (6c)” =
This stored zone address signal is supplied to the CADA decoder (64) of the controller. For example, ID unit) (7a)
supplies zone address signals to the terminal devices (6a), (6b), and (6c). In addition, each ID unit (7a), (7b)... is connected to one of the connected terminal devices (for example, terminal devices (6a), (6d), (6
g) An address setting signal is supplied from the CADA decoder (64) of .

And each ID unit) (7a>, (7b)...
... is the CADA decoder (64
) is configured to store the zone address indicated by the address setting signal supplied from ). Also, when the binary signal for address setting is a high level signal ゛1°°,
Even if an address setting signal is supplied from the CADA decoder (64), the address transmitted at this time is not stored.

And the respective terminal devices (6a), (6b),
(ec) Personal computer (65)
are ID units (7a), (7b)...
The zone address data supplied from the memory (65a
) is stored in the memory.

Next, Fig. 3 shows an example of the configuration of the panel surface of the terminal device (6a).
3) is placed on the left side, and the operation keys (67) are on the right side.
is placed. This operation key (67) is a channel indicator (67a) and a channel amplifier key (67
b), the channel down key (67c), the game selection key (67d), the TV selection key (67e), the enter key (67g), and the audio selection key (67h).
), volume up key (67i), and volume down key (
67j) and a monitor on key (67k). In this case, the channel display (67a) consists of an upper digit display part (67a,) and a lower digit display part (67az),
Each of the display sections (67al) and (67az) can display numbers or some alphabets in 7 segments.

Then, for example, after pressing the TV selection key (67e),
By pressing the channel up key (67b) or channel down key (67c), the monitor receiver (63
), the channel of the video signal to be received can be sequentially switched to the desired one. Similarly, the game selection key (
67d), or by pressing the audio selection key (67h) and then the channel up key (67b) or the channel down key (67c) to select a video game to be played on the monitor receiver (63) or to use the headphones (68). ) allows you to select the audio signal to listen to.

Explanation of the operation when setting the G3 address Next, the operation when setting the zone address to each terminal device (6a), (6b), . . . will be explained. This address setting is performed when the seats are arranged during the manufacture of this airplane, when the seats are replaced, etc. When performing this address setting, it is first performed based on address setting information stored in advance in the master controller (19) of the central control device (1). This address setting information includes information for the zone of the airplane cabin (distinction between first class, business class, and economy class), and in this example, each seat unit (9)
ID units (7a), (7b) and
Set the zone address to... In this case, for example, economy class is zone A, business class is zone B, first class is zone C, and Figures 1 and 2 are
The diagram shows details of Zone A economy class.

For example, if we consider setting a zone address indicating economy class in the ID units (7a), (7b), etc. in the economy class cabin for this zone, the central control unit (1 )'s master controller (19) issues a command to transmit a low level signal ゛°0'' to the address setting binary signal line of zone A, and transmits the low level signal ゛°0'' to the address setting binary signal line of other zones B and C. A command is issued to transmit a high level signal "1 +t" to the terminal. This command causes the system controller (10
), a low level signal “0” is sent out from a predetermined signal line via a modulator (29), and is transmitted to the ID unit (7a
), (7b)... this low level signal "'0
Similarly, a high level signal “°l′° is supplied to the ID units (not shown) in zones B and C.
is supplied. At this time, the master controller (19
) via the system controller (10)
An economy class address setting command is supplied to the encoder (28). With the provision of this command, the CADA encoder (28) creates an economy class address setting signal using data bits DTBT as shown in Figure 5 and sends it from the modulator (29) via the coaxial cable (2). Terminal bags W for all zones (6a), (6b
)... A multiplexed signal containing this data bit DTBT is sent out. At this time, the data bit DTBT has the command CMD as an address setting command, and the address 80S.
R is the zone number for economy class.

By supplying the multiplexed signal including this data bit DTBT to each terminal device (6a), <6b)...
CADA of each terminal device (6a), (6b) "・'
The decoder (64) demodulates the data bit DTBT including this address setting command, and sends the ID unit (7a),
(7b) Predetermined terminal devices (6a), (6d), configured to supply address signals to...
(6g) . . . supplies the demodulated address setting command to the corresponding ID units (7a), (7b) . At this time, the ID unit in zone A) (7a)
.

Since the low level signal "0" is supplied as a binary address setting signal only to (7b)..., ID units (7a), (7b)... in this zone A.
- only stores the zone address indicated by the address setting command from the CADA decoder (64), that is, the economy class zone address. And other zone B,
Similarly, the ID unit in C also has a CADA decoder (64
), but since the high-level signal ""1" is supplied as the binary signal for address setting, the ID units in zones B and C do not store addresses. .

Then, I installed in the seat unit 9) in zone A
The economy class zone address is stored in D units (7a), (7b)..., and this zone A
Each terminal device (6a) of the seat unit (9) in (
6b) This economy class zone address is imported into the personal computer (65) of .

Similarly, when storing zone addresses in ID units of other zones B and C, set only the address setting binary signal supplied to zone B or zone C to a low level signal "0", and then A CADA encoder (28) transmits a multiplexed signal containing zone address setting information of the class to be used.
Send from. Then, the business class zone address or first class zone address is stored in the ID unit in zone B or zone C, and each
Terminal devices (6a) and (6b) connected to D unit
)... The business class zone address or the first class zone address is stored in the personal computer (65).

In this way, each terminal device (6a), (6b)...
Since the address of the zone installed in
By specifying a zone address using the address ADRS, various services can be provided only to passengers (terminal devices) within the corresponding zone (class). For example, if the data bit DTBT is used to transmit receivable information for a specific video channel with a first class zone address added, only the terminal device that stores the first class zone address will be able to select this specific video channel. This will make it possible to provide services exclusively for first class passengers.

In this way, according to the information transmission device of this example, from the central control device (1) to each terminal device (6a), (6b)...
An address can be automatically set for each zone by simply transmitting a one-way information signal to the side, and even a relatively simple system without an uplink has the advantage of automatically setting a zone address.

Although the above embodiment has been explained 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, if the service is provided to a large number of customers.

Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and can take various other configurations without departing from the gist of the present invention.

H Effects of the Invention According to the information transmission device of the present invention, even in the case of a relatively simple system without an uplink from the terminal device to the central control device, there is an advantage that addresses can be automatically set for each zone. be.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the information transmission device of the present invention, FIG. 2 is a perspective view showing the arrangement of the embodiment, and FIG. 3 is a front view showing the terminal device of the embodiment. 4 and 5 are diagrams for explaining one embodiment, respectively. (1) is the central control unit, (2) is the coaxial cable, (6a
). (6b), (6c) = = terminal device, (7a)
, (7b), (7c) are ID units, (10
) is the system controller, (11) is the first VTR1
(12) is the second VTR, (13) is the third VTR1 (
14) is an override VTR. (15) is a still image transmitter, (16) is a TV tuner,
(17) is a video camera, (18) is a microphone, (19)
is the master controller, (20) is the keyboard, (2
1) is a monitor receiver, (23a) to (23g) are RO
M power cartridge (24) is a floppy disk drive (25). 26) is an audio player, (28) is a CADA encoder, (29) is a modulator, (31a), (31b),
(31c) "" is an amplifier, (32) is a distributor, (
33a), (33b), (33c)”...
is a turnout, (61) is a TV tuner, (62) is a CAD
A tuner, (63) is monitor receiver, (64) is CA
DA decoder, (65) is a personal computer, (
65a) is a memory, (66) is a terminal side controller, (
67) is an operation key, and (69) is a joystick.

Claims (1)

[Scope of Claims] An information transmission device in which a plurality of terminal devices are divided into a plurality of zones, and information can be transmitted from a central control device only to the terminal devices in a specific zone, comprising: A command signal is transmitted to the terminal device in this group to enable the terminal device in this group to receive the zone address signal, and then the zone address signal is transmitted from the central control device, and the terminal device in the readable state reads the zone address. An information transmission device characterized in that it captures signals.