JP2545933B2 - Information transmission device - Google Patents

Description

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

A Industrial field of use B Outline of invention C Conventional technology D Problems to be solved by the invention E Means for solving the problem F Action G Example G ₁ Description of central control unit G ₂ Description of terminal device G ₃ Description at Address Setting H Effect of Invention A Field of Industrial Application The present invention is used for transmitting a video signal or the like from a central control unit to a terminal device provided for each passenger seat such as an aircraft, train, or bus. And a preferable information transmission device.

B Outline of the Invention The present invention is an information transmission device that transmits information from a central control device to a plurality of terminal devices provided for each passenger seat such as an aircraft, train, bus, etc. A central control unit is provided with a first pickup for receiving a transmission signal via the strip line and a second pickup for transmitting a noise signal provided for each terminal device, and with a plurality of terminal devices generating noise signals. Command signal to each terminal device to obtain a response, assign an address to the terminal device for which the response signal is obtained, stop the generation of noise signals from this terminal device, and set the address to each terminal device sequentially. Then, the addressing of each terminal device is automatically performed in a predetermined order corresponding to the arrangement of the seats.

C PRIOR ART For example, U.S. Pat. No. 4,647,980 discloses providing a separate video display on a passenger seat of a vehicle such as an aircraft. That is, a video display as a terminal device is individually provided on the passenger seat, and a plurality of video signals are transmitted in parallel from the central control device to these video displays, and one of the signals is selected on each video display side. Is displayed.

D Problems to be Solved by the Invention By the way, in the video display for each seat,
Individual addressing corresponding to the seat number is made, and it is proposed to specify the address from the central control unit side and selectively transmit necessary signals only to the desired video display (terminal device). Has been done.

In this case, each video display corresponding to each seat is provided with an address signal generator set with a different address, and addressing is performed based on the address signal obtained from this address signal generator. Aircraft have tended to increase in size in recent years, and it is very troublesome to perform address setting work on an address signal generator of a video display corresponding to each seat of an aircraft having, for example, 500 or more seats.

The present invention has been made in view of the above problems, and an object thereof is to provide an information transmission apparatus of this type in which address setting is automatically performed.

E Means for Solving the Problem The information transmission apparatus of the present invention is, for example, as shown in FIG.
In the information transmission device in the vehicle that transmits the information signal from the central control device (1) to the plurality of terminal devices (60a), (60b), (60c), ... A stripline (2) is used as a transmission line, and a plurality of terminal devices (60a), (60b),
Command signal generating means (19) to (60c) ... is provided and a plurality of terminal devices (60a), (60b), (60c) ...
Each of the pickups (4a), (4
b), (4c) ... and noise signal sources (8a), (8b),
(8c)… And this noise signal is striplined (2)
Pickups (4a '), (4b'), (4
c ′) …… and pickups (4a), (4b), (4c)…
Transmitters (7a), (7b), (7c) for sending response signals to the central control unit (1) via the ...
A memory (65a) is provided, and a plurality of terminal devices (6a), (6a), a plurality of terminal devices (6a), are generated by a command signal in a state where noise signals are generated from the plurality of terminal devices (6a), (6b), (6c) ...
A response signal is obtained from (6b), (6c) ..., and the noise signal sources (8a), (8b), (8c) ... are turned off by the command signal to the terminal device for which the response signal is obtained. An address is assigned and this address is stored in the memory (65a) to set the address of the terminal device.

F Action According to the information transmission device of the present invention, the central control device (1)
The terminal device (60a) closest to can receive the command signal without being affected by noise, and after addressing this terminal device (60a), by stopping the generation of the noise signal from this terminal device (60a), The terminal device (60b) close to the central control signal (1) can receive the command signal without the influence of noise, this terminal device (60b) is addressed, and so on, and is connected to the strip line (2) in the same manner. Addressing is performed in this order, and the terminal devices (60a), (60b), (60c) ... Are automatically addressed in a predetermined order corresponding to the seat arrangement.

G Embodiment An embodiment of the information transmission device of the present invention will be described below with reference to the accompanying drawings.

This example is applied to a transmission device for transmitting a video signal, an audio signal, etc. in an aircraft.

G ₁ Description of Central Control Unit First, the central control unit will be described. In FIG.
(1) indicates a central control device provided in a crew room,
This central control unit (1) comprises four video tape recorders (hereinafter referred to as VTRs). That is, the first, second, and third VTs into which a tape cassette on which a movie is recorded are loaded.
R (11), (12) and (13), and a VTR (14) for overriding in which a tape cassette in which how to wear a life jacket and the like are recorded is loaded. In this example, each VTR
(11) to (14) use a reproduction signal that can obtain a video signal and an audio signal of three channels (three types) synchronized with the video signal. As the three-channel audio signal, for example, it is conceivable to obtain a monophonic voice in three languages corresponding to a movie, or to obtain a stereophonic voice in one language and a monophonic voice in another language.
Also, a still image transmitter (15) that reproduces a still image recording medium (CD ROM, etc.) on which maps, airfield guide maps, etc. are recorded, and a television that receives ordinary television broadcasts during waiting times at the airport, etc. A tuner (16), a video camera (17) installed in the cockpit to take a picture of takeoff and landing, a microphone (18) for guiding passengers, control of each device, data collection from each terminal device, each Master controller for in-flight management that creates character information to be supplied to terminal devices (19)
A keyboard (20) connected to the master controller (19) for instructing various operations to be described later, and a monitor receiver (connected to the master controller (19) for displaying a total result of the master controller (19) and the like ( 21) and are provided. In this example, the master controller (19) has a clock mechanism, and a crew member sets the Greenwich Mean Time before flight in this clock function unit. These devices (11) to (21) are connected to the system controller (10) of the central controller (1), and the master controller (19) operates the system in response to an operation command from the keyboard (20). Each VTR (11)-(14), CD ROM drive (15), via controller (10)
A control signal is supplied to the TV tuner (16) and video camera (17), and each VT is supplied by this control signal.
Video signals and audio signals by reproduction are supplied from R (11) to (14), a still image video signal is supplied from the CD ROM driving device (15), and a television broadcast signal (from the TV tuner (16) ( The video signal and the audio signal) are supplied, and the captured video signal is supplied from the video camera (17). In this case, the CD ROM drive device (15) is equipped with a CD ROM that stores map information of countries around the world and map information of major cities as coordinate information. In addition, this CD ROM stores information such as place names in languages of a plurality of countries (for example, 6 countries). An audio signal is supplied from the microphone (18). Further, character information is supplied from the master controller (19) to the system controller (10). Then, by operating the keyboard (20), the video signal supplied to the system controller (10) and the character information transmitted from the master controller (19), the data transmitter (27), and the like are displayed on the monitor receiver (21). Can be confirmed by.

Further, (22) indicates a printer connected to the master controller (19), and the data aggregated by the master controller (19) and the like can be printed out for hard copying.

Further, seven ROM cartridges can be mounted in the central control unit (1), and in the case of this example, seven game ROM cartridges (23a), (23b) ... In which respectively different video game programs are stored. Wear (23g). Then, the computer program data read from the ROM cartridges (23a) to (23g) is supplied to a data transmitter (27) described later.

Further, (24) indicates a floppy disk drive connected to the master controller (19), and the data stored in the floppy disk mounted on the floppy disk drive (24) is transferred to the master controller (19).
It is possible to supply new data to the system controller (10) and to store new data or modify the stored data by operating the keyboard (20). The data can be confirmed by the monitor receiver (21) during the storage operation and the correction operation. In this example,
A floppy disk storing meal menu data and the like is attached to the drive unit (24).

Further, (25) and (26) show audio reproducers each provided with three compact disk players and three tape reproducing devices (six in total), and these audio reproducers (25) and (2).
6) reproduces 6 sets of stereo audio signals (that is, 12-channel audio signals) from 6 units at the same time by supplying control signals from the system controller (10), and reproduces 6 sets of stereo audio signals to be described later in CADA. Supply to the encoder (28).

Further, (27) indicates a data transmitter, which is supplied with a control signal from the system controller (10),
Data such as a video game program is read from the M cartridges (23a) to (23g), the read data is subjected to predetermined processing, and then supplied to the CADA encoder (28).

(28) is a CADA encoder used in a conventionally known cable digital audio / data transmission system (CADA system). A CADA system is, for example, time division multiplexed multiple digital audio,
This is a system that transmits using the band (6 MHz) of one available TV channel, and can transmit music and the like very efficiently without deteriorating sound quality. In this example, the bandwidth of two television channels is used to increase the transmission amount. A / A for CADA encoder (28)
It is composed of a D converter and a shift register, converts a plurality of audio signals into digital signals by an A / D converter, and inputs them in parallel to predetermined positions of the shift register, and serially outputs them from this shift register. It is configured such that time division multiplexing is performed by outputting at high speed. still,
It multiplexes not only digital audio but also control data and computer program data.

The CADA encoder (28) receives the above-mentioned audio signal and character information such as a meal menu and data such as a video game program supplied to the system controller (10).
And the audio signal and data are time-division multiplexed and then output as a FSK-modulated CADA data signal S _CA.

That is, as the audio signals supplied to the system controller (10), for example, audio signals of 3 channels (12 channels in total) for each VTR synchronized with the video from the VTRs (11) to (14) and audio reproduction. 6 sets of stereo audio signals (12-channel audio signals) from machines (25) and (26)
And audio signals for each channel from the TV tuner (16) and the microphone (18), there are a total of 26 channels of audio signals. The 26-channel audio signal is time-division multiplexed with other character information and data signals obtained by the CADA encoder (28) to form a CADA data signal S _CA.

In addition, when this transmission device starts up (when the power is turned on)
In addition, by the signal from the master controller (19), audio and video channel assignment information (total number of channels and correspondence between audio channels and video signal channels, etc.) is transmitted as a data signal in the CADA data signal S _CA. I am trying.

Then, the CADA data signal S _CA is supplied to the modulator / demodulator (29), modulated into a signal of a predetermined band of 2 channels, and output. Also, the first to third VTRs (11) to (13) supplied to the system controller (10) and the television tuner (1
The video signals from 6) and the video camera (17) are supplied to the modulator / demodulator (29), respectively, and modulated into the signals of the bands of different channels, that is, the signals of 5 channels, and output. In addition,
The modulation frequency of this modulator / demodulator (29) is 60 or more television broadcasting channels, and in order to prevent intermodulation, it is sequentially modulated in frequency bands of every two channels. Also, the video signal from the override VTR (14) is modulated to a signal on the same channel as the video signal from the first VTR (11).
During playback of the VTR (14), the first VTR (11) is placed in a pause state.

Then, the 2-channel CADA data signal and the 5-channel video signal output from the modulator / demodulator (29) are used as a frequency-multiplexed transmission signal S _MF at one end of the strip line (2) constituting the bidirectional signal transmission means. Supply to.
The strip line (2) is configured, for example, as shown in FIG. 4, and the electrode conductor (2P) and the grounding conductor (2E) are attached to one surface and the other surface of the dielectric (2D), respectively. It will be. In addition, you may mold the whole.

Then, one end and the other end of the grounding conductor (2E) forming the strip line (2) are grounded. The transmission signal S _MF is supplied from the central control unit (1) to one end (2b) of the electrode conductor (2P), and the other end is grounded via a terminating resistor (2a).

In addition, terminal devices (6a), (6b), (6c), which will be described later, ...
The signal S _UP supplied to the strip line (2) from
After demodulating with the modulator / demodulator (29) of the central controller (1), CA
Supply this to the DA encoder (28), this CADA encoder (2
Data from the terminal devices (6a), (6b), ... Is supplied to the master controller (19) from the system controller (10) via the system controller (10).

G ₂ Description of Terminal Device Next, the configuration on the terminal side will be described. The above-mentioned strip line (2) is set up in the cabin of the aircraft as shown in FIG. 2, and the seats for each passenger are, for example, one set of seat units (9) for three persons (9a). ), (9
b) and (9c) are provided, and the seat units (9) are arranged in two horizontal rows, for example, one set on the left and one on the right across the central passage. And these three seats (9a), (9b),
The seat unit (9) provided with (9c) will be described. Each seat unit (9) is provided with a group of terminal devices (60a), (60b), (60c). Three terminal devices are installed for each device group (60a), (60b), (60c). That is, each terminal device group (60
a), (60b), (60c) ... are pickups (4) for capturing transmission signals from the strip line (2).
a), (4b), (4c) ... are provided, and the signals captured by the pickups (4a), (4b), (4c) ... are distributed (5a), (5b), (5c). ......, and the respective distributors (5a), (5b), (5c) ... distribute the signal to 3 and distribute the signal to the respective seat units (9) for each seat (9a), (9).
b), terminal devices (6a), (6b) provided for each (9c),
(6c) Supply to. In addition, the pickups (4
Separately from a), (4b), (4c) ...
a), (60b), (60c) ... Pick up (4a '),
(4b '), (4c') ... are provided, and the transmitters (7a), (7) of the terminal device groups (60a), (60b), (60c).
b), (7c) ... are this pickups (4a '), (4
It is connected to b '), (4c') .... In this example, the strip line (2) of each system is used in the left column and the right column.

Here, the pickups (4a), (4b), (4c) of this example
.. and (4a '), (4b'), (4c ') ... will be explained. Each pickup has the same structure as the strip line (2) shown in FIG. Is. For example, as shown in FIG. 5, in the pickup (4a), one end of the electrode conductor (41) is grounded through the terminating resistor (42), and the transmission signal S which is a detection output from the other end.
_Take out the _MF . Further, the grounding conductor (43) is grounded. The arrangement relationship with the strip line (2) is as shown in FIG.
P) and the electrode conductors (41) of the pickups (4a), (4b) ... Are arranged at a predetermined interval so as to face each other.
Here, (44) is the dielectric of the pickup. In this case, in this example, a spacer (45) made of a dielectric is provided around the electrode conductor (41) of the pickup, and the spacer (45) is used to form the strip line (2) and the pickups (4a) and (4b). I try to keep a certain distance from.

Then, each terminal device group (60a), (60b), (60c) ...
The pickups (4a), (4b), (4c) ... and the pickups (4a '), (4b'), (4c ') ... are connected in the opposite direction to the strip line (2). I am doing it. That is, when the terminal device group (60a) is shown in FIG. 7, the side to which the terminating resistor (42) of the electrode conductor (41) of the pickup (4a) is connected and the electrode conductor of the pickup (4a ′). (Four
The side to which the terminating resistor (42) of 1) is connected is placed in close proximity. The pickup (4a) receives the transmission signal S _MF from the central controller (1) and the terminal device group (60).
It is used for transmitting the transmission signal S _UP from the transmitter (7a) of a) to the central control unit (1). In addition, the pickup (4
a ') is used for transmitting a noise signal from a noise generator (8a) described later to the strip line (2). The other terminal groups (60b), (60c), etc. also have pickups.

And these terminal devices (6a), (6b), (6c) ...
Is the passenger seats (9a), (9b), as shown in FIG.
Although it is arranged on the back surface of (9c) and only one terminal device (6a) is shown in detail in FIG. 1, other terminal devices (6b), (6c) ... Have the same configuration. The terminal device (6a) supplies the transmission signal distributed by the distributor (5a) to the TV tuner (61) and the CADA tuner (62), and the TV tuner (61) strips from the central controller (1). Of the signals of the plurality of channels transmitted to the line (2), a predetermined channel for transmitting the video signal is selected and demodulated based on tuning information described later, and the demodulated video signal is monitored (63) To receive the video signal. A signal supplied from the personal computer (65) to the TV tuner (61) causes graphics or characters such as a map to be displayed on the monitor receiver (63).

In addition, the CADA tuner (62) is a two-channel transmitting CADA data signal in which a voice signal and data are multiplexed among signals of a plurality of channels sent from the central control unit (1) to the strip line (2). The signal of is demodulated and the demodulated signal is supplied to the CADA decoder (64). When the demodulated signal includes tuning information, the tuning information is supplied to the TV tuner (61). And this CADA decoder (6
4) retrieves desired data (or audio signal) from the CADA data signal S _CA according to the operation of the operation key (67) of the terminal device (6a) described later, and the retrieved data is the personal computer (65). Or terminal side controller (6
Supply to 6). A memory (65a) is connected to the personal computer (65). The operation key (67) is connected to the terminal side controller (66), and the operation command from the operation key (67) is supplied to the controller (66). In addition, this terminal side controller (66),
Headphones (68) via terminals (66a) and (66b) respectively
And the joystick (69) can be connected.

Further, the terminal devices (6a), (6b), (6c) of this example ...
Can transmit data to the central control device (1). That is, each terminal device (6a),
The data obtained by the personal computer (65) of (6b), (6c) ... is supplied to the CADA decoder (64), and one piece is installed from this CADA decoder (64) to one seat unit (9). This data is supplied to the transmitters (7a), (7b), (7c). At this time, each terminal device (6
The address number data stored in the memory (65a) of a), (6b), (6c) ... Is added and supplied. And
Each of the transmitters (7a), (7b), (7c) ... Modulates the data supplied from the terminal devices (6a), (6b), (6c) .. Signal distributor (5a),
(5b), (5c) ... through pickup (4a), (4
b), (4c) ... By doing this,
A transmission signal S _UP as a modulation signal is transmitted from the pickups (4a), (4b), (4c), ... to the central control unit (1) through the strip line (2), and the modulator / demodulator (1) of the central control unit (1) is transmitted. Demodulation is performed in 29).

Further, noise generators (8a), (8b), (8c) ... are connected to the respective transmitters (7a), (7b), (7c) ..., and the central control unit (1) side Is supplied to each terminal device from
Based on the CADA data signal S _CA , the personal computer (65) of each terminal device generates noise generators (8a), (8b),
(8c) Controls the generation of noise signal S _N from. In this case, the noise signal S _N is a signal of white noise, single carrier, etc., and as shown in FIG. 10, is a signal in a frequency band overlapping with the CADA data signal S _CA , and the terminal devices (6a), (6
Transmission signal S from b), (6c) ... to the central control unit (1)
_{The UP} and the noise signal S _N are set so that the transmission frequencies do not overlap.

Further, when the personal computer (65) of each of the terminal devices (6a), (6b), (6c) ... Is supplied with an address setting signal from the central control unit (1) side by the address setting work described later, The address number designated by the address setting signal is stored in the memory (65a), and the stored address number is used as the address number of each terminal device. In addition, in this example, three terminal devices (for example, (6a), (6
In b) and (6c)), the upper digit part uses a common address number, and the lower digit part information distinguishes the left side, the center, and the right side. Each terminal device is automatically set to the one corresponding to its position (left center, right side), and the central controller (1)
From the side, only the information of the address number in the upper digit part is supplied.

In addition, when the power of this transmission device is turned on, the data signals in the CADA data signals supplied from the central control unit (1) as described above are used by the respective terminal devices (6a), (6b), (6c). The CADA decoder (64) demodulates the channel ratio information and supplies it to the personal computer (65). When this channel assignment information is supplied to the personal computer (65), the memory (65
Information is stored in a) in proportion to this channel. Then, at the time of selecting the television channel and the audio channel in each of the terminal devices (6a), (6b), (6c) ..., the personal computer (65) outputs the channel ratio to the TV tuner (61) based on the information. It controls the selection of the video signal and the selection of the audio signal in the CADA decoder (64).

Next, FIG. 8 shows a configuration example of the panel surface of the terminal device (6a). A monitor receiver (63) using a flat cathode ray tube is shown.
Is arranged on the left side, and the operation key (67) is arranged on the right side. The operation keys (67) are the channel display (67a), the channel up key (67b), the channel down key (67c), the game selection key (67d), the television selection key (67e), and the menu selection. Key (67f),
Enter key (67g) and audio selection key (67h)
And volume up key (67i) and volume down key (67j)
With. In this case, the channel indicator (67a)
It consists of a high-order digit display section (67a ₁ ) and a low-order digit display section (67a ₂ ), and each of the display sections (67a ₁ ) and (67a ₂ ) can display a number or a part of the alphabet in 7 segments.

Then, for example, after pressing the TV selection key (67e),
By pressing the channel up key (67b) or the channel down key (67c), the channel of the video signal to be received by the monitor receiver (63) can be sequentially switched to a desired one. Similarly, select the game selection key (67
d) After pressing the menu selection key (67f) or the audio selection key (67h), and then pressing the channel up key (67b) or the channel down key (67c), a video game executed on the monitor receiver (63) , A menu, or an audio signal to be heard through the headphones (68).

Explanation of G ₃ address setting Next, each terminal device (6a), (6
The operation when setting an address to b), (6c) ... will be explained.

This address setting is performed when the seats are arranged and the seats are exchanged when the airplane is manufactured. When setting the address, first, the address is set based on the address setting information stored in advance in the master controller (19) of the central controller (1). In this address setting information, a seat layout table in the cabin of this airplane and addresses assigned to each seat on this layout table are stored.

Then, addressing is performed under the control of the master controller (19) based on this address setting information. At this time, from this master controller (19) CADA
As the CADA data signal S _CA via the encoder (28),
Noise signals on all terminals (6a), (6b), (6c) ....
Instruct generation of S _N. Each terminal device (6a), (6b), (6
When this command arrives at c) ..., each terminal device group (60
a), (60b), (60c) ... Noise generators (8a), (8
b), (8c) ... Simultaneously outputs noise signals S _N , and the transmitters (7) of each terminal device group (60a), (60b), (60c).
Pickup (4) connected to a), (7b), (7c) ....
From a '), (4b'), (4c ') ..., the noise signal S _N is supplied to the strip line (2).

In this state, the master controller (19) of the central controller (1) outputs an address setting signal to the strip line (2) as a CADA data signal S _CA via the CADA encoder (28). The address setting signal at this time is
The master controller (19) includes information indicating the address of the frontmost seat on the seat layout table stored in the master controller (19).

This CADD data signal S _CA is supplied to each terminal device (6a), (6b), (6c), etc. through the strip line (2), but the noise signal S _N mentioned above is the CADA data signal S _CA.
Since it occurs in the same frequency band as
In a), (6b), (6c), etc., when the CADA data signal S _CA is received, it is affected by the noise signal S _N. The effect of this noise signal will be described below.

First, the strip line (2) and each pickup (4
a), (4b), (4c) ... and (4a '), (4b'), (4
Considering the coupling state with c ') ..., the coupling between this strip line (2) and each pickup has a certain direction. That is, as shown in FIG. 7, pickups (4a), (4b), which receive the transmission signal S _MF from the central control device (1) and transmit the transmission signal S _UP from the terminal device,
(4c) ... is the strip line (2) and the terminating resistor (4
2) are connected in the same direction. Therefore, the signals supplied from the central control unit (1) side (terminal (2b) side) to the strip line (2) are picked up (4a), (4).
b), (4c) ... through each terminal device (6a), (6b),
(6c) …… When receiving with this pickup (4
The coupling loss L _{F in} a), (4b), (4c), etc. (shown by the solid arrow in FIG. 7) is, for example, −25 dB. If there is a signal supplied to the strip line (2) from the terminating resistor (2a) side of the strip line (2), this signal is picked up (4a), (4b), (4c) ...
When receiving at each terminal device (6a), (6b), (6c) via ..., the pickups (4a), (4b), (4
c) The coupling loss L _R at ... (indicated by the solid arrow in Fig. 7) is -35 dB, for example.

Also, pickups (4a '), (4b'), which send out noise signals from the noise generators (8a), (8b), (8c) ....
(4c ') ... The strip line (2) and the terminating resistor (42) are connected in opposite directions. Therefore, the terminating resistance of the strip line (2) from each of the noise generators (8a), (8b), (8c) ... through the pickups (4a '), (4b'), (4c ') ... The coupling loss L _F of the signal transmitted to the (2a) side is −25 dB, for example. The coupling loss L _R of the signal sent to the terminal (2b) side, which is the central controller (1) side, is, for example, −35 dB.

With the coupling loss L _F and L _R ,
CADA for each terminal device group (60a), (60b), (60c) ...
The influence of the noise signal S _N when receiving the data signal S _CA is different. That is, assuming that M groups of terminal devices are connected on the stripline (2) as shown in FIG. 9, the signal-to-noise ratio extracted from the Jth connected pickup is shown. Is as follows.

However, L is a transmission loss for each arrangement interval of the pickups (4a), (4b), (4c), ... Of the stripline (2).

Next, a specific numerical example is shown.
L _F and L _R are the above values (L _F = −35 dB, L _R = −25 dB), transmission loss L = −0.58 dB (sheet pitch 1 m), CADA data signal S _CA from the central control unit (1) (S / N) ₁ , (S / N) ₂ ... with the power S = 0 dBm at the terminal (2b), the power _N of the noise signal S _N = 20 dBm, and the number of sheets (terminal devices) M = 10. 1
Pickups (4a), (4b) arranged on the second, second ...
Assuming the signal-to-noise ratio extracted from ……, (S / N) ₁ = 16.7dB (S / N) ₂ = 4.2dB (S / N) ₃ = 1.0dB (S / N) ₄ = -1.0dB ( S / N) ₅ = -2.6 dB (S / N) ₆ = -3.9 dB (S / N) ₇ = -5.0 dB (S / N) ₈ = -6.0 dB (S / N) ₉ = -6.9 dB ( S / N) ₁₀ = −7.7 dB.

Here, the CADA data signal S _CA is FSK modulated, but this FSK modulated digital data has a bit error rate unless the signal-to-noise ratio at the time of reception is about 10 dB or more.
^10-4 not below, can not be normally demodulated and decoded, 10 dB
In the following cases, the original digital data could not be obtained.

Therefore, in the case of the numerical example described above, the signal-to-noise ratio is
Only the signal obtained from the pickup (4a) of the first terminal device group (60a) exceeds 10 dB, and each terminal device (6a), (6b) of this terminal device group (60a), (6
The normal CADA data signal S _CA is supplied only to c), and the address setting signal included in the CADA data signal S _CA at this time is the personal computer (65) of this terminal device (6a), (6b), (6c). Is supplied to.

When the address setting signal is supplied to the personal computer (65) of the terminal device (6a), (6b), (6c),
The memory (65a) connected to each personal computer (65) stores the address number indicated by the address setting signal. At this time, the three terminal devices (6a), (6b) of one terminal device group (60a),
In (6c), only the common upper-order digit address number is designated by the address setting signal, and the corresponding lower-order digit portion is automatically set to the corresponding address number. For example, when the terminal device group (60a) is instructed to add the X number as the address number, the terminal device (6a) receives the X number 1, the terminal device (6
b) is addressed as X number 2, and the terminal device (6c) is addressed as X number 3.

When the address setting work of this terminal device (6a), (6b), (6c) is completed, each terminal device (6a), (6b), (6c)
Data indicating the end of address setting is added to the transmitter (7a) from the personal computer (65), and the data is sent from the transmitter (7a) to the antenna (4).
It is sent to the strip line (2) via a) and supplied to the master controller (19) of the central controller (1).

Then, when the address setting end data from the terminal devices (6a), (6b), (6c) is supplied to the master controller (19) of the central control device (1), it is stored in the master controller (19). An address setting signal indicating the address of the second row seat from the front in the seat layout table is output from the master controller (19) and is also connected to the terminal device group (60a) that is the first connected and already assigned an address. The master controller (19) outputs a command signal to stop the generation of noise from the generated noise generator (8a),
The generation of the noise signal S _N from this noise generator (8a) is stopped.

By doing so, the noise signal S _N is not sent from the pickup (4a ′) to the strip line (2), and each noise signal S _N connected to the rear of the pickup (4a ′) via the strip line (2). Terminal device group (60b), (6
0c) .... is no longer affected by the noise signal S _N from the terminal device group (60a). Therefore, the signal-to-noise ratio of the signal extracted by the terminal device group (60b) connected next to the terminal device group (60a) becomes a value close to (S / N) ₁ described above, and exceeds 10 dB. Therefore, the seat unit (9) in the front row and the terminal devices (6a), (6) of the seat unit (9) in the second row
b), (6c), (6d), (6e), and (6f) perform normal reception of the CADA data signal S _CA , and supply address setting signals to the respective personal computers (65).

At this time, since the address numbers have already been set in the terminal devices (6a), (6b), (6c) of the seat unit (9) in the first row by the above-mentioned work, the subsequent address setting signal is ignored. It Therefore, the second row seat unit (9)
Memories (65a) connected to the personal computers (65) of the terminal devices (6d), (6e), and (6f) of FIG.
The address number indicated by the address setting signal is stored in the same manner as in the case of the seat in the first row described above.

Then, when the address setting work of these terminal devices (6d), (6e), (6f) is completed, each terminal device (6d), (6
The data indicating the end of address setting is supplied from the personal computers (65) of (e) and (6f) to the transmitter (7b) with the address number just added, and picked up from the transmitter (7b) (4b). It is sent to the stripline (2) via the and is supplied to the master controller (19) of the central controller (1).

When the master controller (19) of the central control unit (1) confirms that the addressing of the seats in the second row is completed, the third row from the front in the seat layout table stored in the master controller (19) is confirmed. A command signal that outputs an address setting signal indicating a seat address and that stops the generation of noise from the noise generator (8b) connected to the second terminal device group (60b) that has already been addressed Is output from the master controller (19) to stop the generation of the noise signal S _N from the noise generator (8b).

By doing so, the signal-to-noise ratio of the signal extracted by the terminal device group (60c) connected next to the terminal device group (60b) becomes a value close to (S / N) ₁ above, and 10 dB
The CADA data signal S _CA will be received normally and the address can be set.

In this way, each terminal device (6a), (6b), (6c)
...... Addressing and noise generators (8a), (8b), (8
c) By repeating the work of alternately stopping the output of the noise signal S _N from ... until the seat in the last row, the address stored in the master controller (19) of the central control unit (1) is stored in this terminal. Device group (60a), (60b), (60c) ……
It is set for each seat, and all seats in the cabin of this airplane are automatically set. Then, when the address setting for all seats is completed, all noise generators (8a), (8a)
b), (8c), ... Since the output of the noise signal S _N is stopped, the terminal devices (6a), (6b),
(6c) …… The effect of the noise signal S _N is completely eliminated, and
CADA data signal S _CA can be received. And
Until you replace the seat unit (9), change the layout, etc.
Since the set address is maintained, various information is transmitted between the central control unit (1) and each terminal unit (6a), (6b), (6c), etc., and various services are provided to passengers. Be seen. At this time, as a CADA data signal transmitted from the central control unit (1), by adding a signal designating the address of a specific terminal device, the terminal device in which the designated address number is set (stored) The CADA data signal is demodulated, and it becomes possible to perform a predetermined service targeting only this specific terminal device.

In this example, the terminal devices (6a), (6b), (6
c) ... is configured as a group for each seat unit (9), and power supply and addressing are performed for each group, so that the configuration becomes simpler.

In addition, as shown in FIG.
The seat units (9) are arranged in rows, and in the above-mentioned work, only one row of address setting is performed, but in this example, the central control unit (1) to each seat unit (9) is set.
The strip lines (2) for supplying the information signals to the terminal devices (6a), (6b), (6c), etc. of the above are provided as separate systems for each column, so that the strips of one system are set at the first address setting. By supplying the address setting signal only to the line (2) and supplying the address setting signal to the strip line (2) of the other system at the time of the second address setting, the address setting of all columns is performed separately. By the control of the master controller (19), different addresses can be additionally printed for each column.

In addition, in the above-mentioned embodiment, although the passenger plane has been described as an example, if the service is provided to a large number of opponents,
It can also be applied to vehicles such as trains and buses, or to theaters and stadiums.

Furthermore, it is needless to say that the present invention is not limited to the above-described embodiments and various other configurations can be adopted without departing from the gist of the present invention.

H Effect of the Invention According to the information transmission apparatus of the present invention, the addressing of each terminal device is automatically performed in a predetermined order corresponding to the seat arrangement, and there is an advantage that the address setting work does not take time.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the information transmission apparatus of the present invention, FIG. 2 is a perspective view showing the arrangement of the embodiment, and FIG. 3 is a block diagram for explaining the example of FIG. FIG. 4 is a block diagram showing an example of a strip line, FIG. 5 is a block diagram showing an example of a pickup, FIG. 6 is a sectional view showing a connection state between the strip line and the pickup, FIGS. 7, 9 and
FIG. 10 is a schematic diagram for explaining the example of FIG. 1, and FIG. 8 is a front view showing a terminal device of one embodiment. (1) is a central control unit, (2) is a strip line,
(4a), (4b), (4c) ... and (4a '), (4b'),
(4c ') …… is a pickup, (5a), (5b), (5c)
...... is a distributor, (6a), (6b), (6c) …… is a terminal device, (7a), (7b), (7c) …… is a transmitter, (8a),
(8b), (8c) ... is a noise generator, (10) is a system controller, (11) is a first VTR, (12) is a second VTR,
(13) is the third VTR, (14) is the override VTR,
(15) is a still image transmitter, (16) is a TV tuner, (1
7) is a video camera, (18) is a microphone, (19) is a master controller, (20) is a keyboard, (21) is a monitor receiver, (22) is a printer, (23a) to (23g) are ROM cartridges, (24) is a floppy disk drive,
(25) and (26) are audio reproducers, (28) is a CADA encoder, (29) is a modulator / demodulator, (60a), (60b), (60c) ...
... are terminal devices, (61) TV tuner, (62) CADA tuner, (63) monitor receiver, (64) CADA decoder, (65) personal computer, (65a) memory, (66a) ) Is the terminal controller, (67) is the operation key,
(69) is a joystick.

Claims (1)

(57) [Claims] 1. An information transmission device in a vehicle for transmitting an information signal from a central control device to a plurality of terminal devices respectively arranged in a plurality of seats, wherein a strip line is used as a transmission line for the information signal, and the central control device is used. The apparatus is provided with a command signal generating means for the plurality of terminal devices, and each of the plurality of terminal devices has a first pickup for receiving the information signal and the command signal, and a noise signal generation source, A second pickup for propagating the noise signal to the stripline, a transmitter for sending a response signal to the command signal to the central control unit via the first pickup, and a memory means are provided. In the state where the noise signal is generated from the plurality of terminal devices by the command signal, the response signal is transmitted from the plurality of terminal devices by the command signal. The noise signal generating source is turned off by the command signal and an address is assigned to the terminal device for which the response signal is obtained, and the address is stored in the memory to set the address of the terminal device. An information transmission device characterized in that