JPH02127880A - Video signal transmitter in vehicle - Google Patents

Abstract

PURPOSE:To display a message such as a special newscast to plural terminal equipments without using a special device for override by providing a character signal generating means, a means superimposing a character signal on a video signal and a means modulating a video signal to a central controller side. CONSTITUTION:Character signal generating means 54, 55, 57, 58 generating a character signal to a central controller 20, means 53a-53f superimposing the character signal on the video signal and a means 11 modulating the video signal superimposed with the character signal are provided to a video signal transmitter in a vehicle sending a video signal to plural terminal equipments 30 arranged respectively to plural seats from the central controller 20. Then a signal corresponding to a message desired to be sent to passengers as the character signal is inputted to the means 53a-53f to send the message to the plural terminal equipments 30. Thus, the message is sent at any time to passengers or the like without an override function.

Description

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

A. Industrial field of application B. Summary of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem F. Effect G. Example H. Effect of the invention A. Field of industrial application. The present invention relates to a video signal transmission device that transmits video signals from a central control device to terminal devices provided in passenger seats of aircraft, trains, buses, etc.

B. Summary of the Invention The present invention is an in-vehicle video signal transmission device that transmits video signals from a central control device to a plurality of terminal devices respectively arranged in a plurality of seats, in which a character signal is generated on the side of the central control device. By providing a means for generating a character signal, a means for superimposing the character signal on the video signal, and a means for modulating the video signal on which the character signal is superimposed, special equipment for override (forced reception) can be used. This allows messages such as breaking news to be displayed on multiple terminal devices without using them.

C. Conventional technology For example, in airplanes, trains, buses, and other vehicles, information signals such as video signals and audio signals are sent from a central control device installed in the crew cabin to multiple terminal devices placed in multiple seats. It is proposed to transmit.

Fig. 2 shows an information signal transmission device in an aircraft proposed by the present applicant in Japanese Patent Application No. 1982-19982. In Fig. 2, (20) is a central control device installed in the crew cabin; Information signals such as video signals and audio signals are transmitted from this central control device (20) to a plurality of terminal devices (30) provided in each passenger seat.

In FIG. 2, (1a) to (1d) are video tape recorders installed on the transmission side, such as in a crew cabin. The video tape recorder (1a) is for override (forced reception), and is loaded with a cassette tape in which information such as how to put on a life jacket is recorded.

Further, video tape recorders (lb) to (1d) are loaded with cassette tapes on which movies are recorded.

These video tape recorders (1a) to (1d) include:
A terminal (2) 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 (la) to (1d) are bilingual, terminals R and R are output terminals for the left and right audio signals in the language of the second country, respectively, and terminal A is This is an output terminal for monaural audio signals in the language of the second country.

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.

In addition, (3) is a still image playback device that plays compact discs, so-called CDs, on which maps, airplane guide maps, etc. are recorded.
It is designed to play ROM. This still image reproducing device (3) is provided with a terminal (2) 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 comprising three compact disc players (CD players) and three tape recorders;
) 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 polyurethane that adjusts the level of the audio signal from the microphone (5a), (5c) is an announce key, (5d) is an override key, (
5e) to (5g) are each video tape recorder (1b)
This is a Bose key for putting ~(1d) into a pause state. Terminals V of video tape recorders (1a) and (lb)
The video signal obtained at terminals R and A and the audio signal obtained at terminals R and A are respectively 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 (V, R, A) are connected to a video tape recorder (LB). The video signal obtained at terminal V and terminal LR,
The audio signal obtained at terminal A is output, but when the override key (5d) is pressed to turn on the override, the video signal obtained at terminal ■ of the video tape recorder (1a) and the audio obtained at terminals R and A are output. A signal is output. Also, when pressing the announce key (5c) to turn on the announcement, the microphone (5c) is connected to output terminal A.
The audio signal from a) is output.

Further, (6) and (7) are CADA encoders used in conventionally known cable digital audio/data transmission systems (CADA systems).

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 transmit music etc. extremely efficiently 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 not only digital audio but also control data and data for computer software can be multiplexed.

Output terminal R of the above-mentioned control device (5).

The audio signal obtained at A is supplied to an encoder (6). In addition, the audio signals obtained at the output terminals of the video tape recorder (IC) and (ld), R and A are output to the encoder (
6). Further, 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, there are 6 pairs of output terminals for audio reproduction a (4a), 3 pairs of output terminals for R and audio reproduction m (4b), and the audio signal obtained at R is sent to the encoder (6) via the control device (5). ) and (7).

In addition, the override key (
5d), announce key (5c), pause key (5
When e) to (5g) are pressed, this control device (5) generates control data SC9 with contents corresponding to the pressed key, and this control data S
C is supplied to the encoder (6).

The encoder (6) is provided with output terminals A to E from which pause control signals are output in accordance with the control data SC1. ) ~(l
d) The audio players (4a) and (4b) are controlled. That is, when the override key (5d) and the announce key (5c) are pressed, a pause control signal is output to the output terminals A to E, and the video tape recorder (lb)
~(ld), the audio playback devices (4a) and (4b) are all in a pause state. Also, pause keys (5e) to (5
When g) is pressed, a pause control signal is output to output terminals A to C, respectively, and the video tape recorder (lb)
, (ld) are each put into a pause state.

Further, (8) is a master controller 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.
C2 is supplied to the 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) ~(
The computer software data SD read from step 9h) 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 to the encoder (7) by the encoder (6).

In addition, the output terminal 0 of the encoder (6) is supplied with a signal SC obtained by digitally converting the plurality of supplied audio signals and time-division multiplexed control data SCI and SC2.
A1 is obtained, and this signal 5CAI is supplied to a modulator (Hf) and subjected to AM cross-modulation using the VSB (vestigial sideband) method. Furthermore, the output terminal O of the encoder (7) receives a signal 5CA2 which is a time-division multiplexed signal of the digitally converted plurality of supplied audio signals, control data sc, , sc, and computer software data SD.
This signal 5CAt is supplied to the modulator (l1g) and subjected to AM cross-modulation using the VSB method.

Further, the video signal obtained at the output terminal V 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 cross modulation is possible with B method.

Also, video tape recorders (LC), (LD)
, the video signals obtained at the output terminals ■ of the tuner (2) and the still image player (3) are transmitted to the modulators (llb) to (lb), respectively.
ie) and subjected to AM cross-modulation 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 (l1g) are supplied to an adder (12) and frequency multiplexed. The frequency-multiplexed signal S□ from the adder (12) is then supplied to one end of a key cable (leaky cable) (21), which constitutes a bidirectional signal transmission means, via a duplexer (13). Ru. The other end of this leaky cable (21) is connected to a terminating resistor (22) for termination. The key cable (21) is, for example, a coaxial cable with a spiral cutout around it to increase the amount of signal leakage.

Further, (30) is a terminal device that is individually installed in a passenger seat of an 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 514F 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 CAD tuner (34) via a demultiplexer (32).
supplied to The tuner (33) is the modulator (lla) ~
The tuner (34) is configured to selectively receive channels in the output frequency band of the modulator (llf) and (l1g), and the tuner (34) is configured to selectively receive channels in the output frequency band of the modulator (llf) and (l1g). Tuner (3
Channel selection in 3) and (34) is controlled by a selection display (35).

Further, the video signal and audio signal outputted from the tuner (33) are supplied to the selection display device (35), and the time division multiplexed signal 5CAI outputted from the tuner (34).
Alternatively, 5 cAz is supplied to the CADA decoder (36). The CAD^ decoder (36) is configured to operate almost inversely to the above-mentioned CADA encoders (6) and (7), and outputs control data sc, , sc, and a selective display device from the time division multiplexed signal 5CAI or 5cAz. (
35), desired audio signals and data for computer software are extracted. That is, the CADA decoder (36) is configured with a shift register and a D/^ converter, and receives the time division multiplexed signal 5CAI or 5cAz.
are serially input to a shift register, and control data sc, , sc,
are taken out in parallel, and a selection display device (35)
A desired audio signal and combiator software data SD are taken out in parallel from a predetermined position of the shift register in accordance with the control of the shift register. In this case, the audio signal is converted into an atelolog signal via a D/A converter. Two D/A converters are used for stereo, so two in total are sufficient. The audio signal extracted by this CADA decoder (36) is supplied to a selection display device (35). Further, the computer software data SD retrieved by this CAD decoder (36) is transferred to a personal computer (
37) and written into the RAM. Also,(
35a) is a flat picture tube, (35c) is a headphone,
(35e) is a joystick for games.

This conventional example is configured as described above, and the video signals output from the video tape recorders (la) to (ld), the tuner (2), and the still image player (3), and the video tape recorders (la) to ( ld), tuner (2), still image player (3).

a CADA encoder (6) that time-division multiplexes the audio signals output from the audio playback devices (4a) and (4b);
The output signals SeA++5eAz of (7) are modulated by modulators (lla) to (l1g), respectively, and added to form a frequency multiplexed signal SSV. This frequency multiplexed signal Sl'lF is then supplied to the leaky cable (21) and transmitted to the receiving side.

The terminal device (30) on the receiving side can select a desired one from among the plurality of video signals, audio signals, etc. transmitted as the frequency multiplexed signal S□ by controlling the selection display device (35).

Also, the reading light key (35q) from the terminal device (30)
, data indicating that the steward descall key (35p) has been pressed, data indicating the selection state of the selection display device (35), etc. are modulated by the transmitter (38) and then sent to the duplexer (3
2) and the leaky cable (
21). This data is then supplied from the leaky cable (21) to the CADA encoder (6) via the duplexer (13). And this data is C
The reading light is supplied to the CPU in the ADA encoder (6).

The light emission of the steward's call light is controlled, or this data is supplied to the master controller (8) to collect statistics on audience ratings and the like.

Moreover, the control data SC, SC2 from the control device (5) and the master controller (8) are
It is multiplexed with the audio signal by CADA encoders (6) and (7), and is supplied to the terminal device (30) on the receiving side.

The selection display device (35) is controlled by the control data sc+, scz, and the reception state of the terminal device (30) is forcibly controlled to a constant state. For example, when the control device (5) turns on the override, the terminal device (30) uses the control data SC3.
As a result, the video signal and audio signal output from the video tape recorder (1a) are brought into a receiving state, and the volume is also controlled to be constant.

D Problems to be Solved by the Invention In general, in aircrafts, etc., there are cases where it is necessary to convey messages such as special news 1 flight information, meal menus, duty-free items, and other messages to passengers at any time. In such a case, in order to convey such a message using the information transmission device shown in the example in FIG. and audio player (4a), (4
b) are all in a pause state, and the video signal from the video tape recorder (1a) for override (forced reception) or the computer software data SD recorded in the menu ROM (9a) is sent to each terminal device (30). It was as if it was being sent by force.

However, in order to realize the above-mentioned so-called override function, the mechanism becomes complicated and the price of the entire system increases.

Furthermore, flight information, for example, may be rescheduled; in such cases, in order to convey video information in addition to audio information, re-editing is required on the override video tape recorder (1a). This has the disadvantage that the tape cassette must be reloaded, making it difficult to change the contents of the message.

In view of the above, an object of the present invention is to propose an in-vehicle video signal transmission device that can transmit messages to passengers at any time even if it does not have an override function, and can easily change the contents of the messages to be transmitted. shall be.

E. Means for Solving the Problems The in-vehicle video signal transmission device according to the present invention is an in-vehicle video signal transmission device that transmits video signals from a central control device (20) to a plurality of terminal devices (30) respectively arranged in a plurality of seats. In the video signal transmission device, character signal generating means (54), (55) for generating character signals on the central control device (20) side thereof.
, (57), (58), means (53a) to (53f) for superimposing the character signal on the video signal, and means (11) for modulating the video signal on which the character signal is superimposed. It is.

According to the present invention, by inputting a signal corresponding to a message to be conveyed to passengers etc. as a text signal to the means (53a) to (53f) for superimposing the text signal on a video signal, the multiple The message is transmitted to the terminal device (30). Therefore, even without an override function, messages can be transmitted to passengers and the like at any time.

Further, character signal generating means (54), (55),
(57) and (58), the contents of the message to be transmitted can be easily changed.

G. Embodiment Hereinafter, one embodiment of the in-vehicle video signal transmission device of the present invention will be described with reference to FIG. In this example, the present invention is applied to a video signal transmission device in an aircraft.
In the figure, parts corresponding to those in FIG. 2 are given the same reference numerals, and detailed explanation thereof will be omitted. Furthermore, in this example, the CADA encoders (6), (7), etc., which were used mainly for transmitting audio signals in the conventional example, are omitted.

In Figure 1, (51) is a video camera for photographing the scenery outside the aircraft during takeoff and landing, etc., and (52) is a video control unit (VCU). six superimposition circuits (53a) for superimposing character signals on specific scanning line signals;
(53f) are provided, and these superimposing circuits (53a) to (53
Connect a video tape recorder (1
b) to (ld) supply video signals output from a still image player (3), a television tuner (2), and a video camera (51). Also, (54) is type manuscript M
An electronic camera (55) is a message keyboard for manually typing the message you want to convey to passengers, and the character signals generated by the electronic camera (54) and keyboard (55) are are respectively input to the slave controller (56). The character signal from the electronic camera (54) is simultaneously supplied to the telopper (57), which gradually flows the input character signal vertically or horizontally on a monitor receiver, etc. (so-called scrolling). Converts the character signal into a character signal corresponding to the character shown in the image (56) and supplies it to the slave controller (56). Further, (58) is an internal ROM that converts information such as departure and arrival times, meal menus, duty-free items, etc. into character signals and stores them.The character signals from this internal ROM (58) are also transferred to its slave controller (56). ).

Further, (59) is an operation keyboard for giving instructions for the next operation to the master controller (8a), (60)
is a monitor receiver, and its operating keyboard (59)
By operating the slave controller (56), the slave controller (56) can be controlled via the master controller (8a).

The character signal output terminal of the slave controller (56) in the video control unit (52) is connected to the superimposing circuit (53).
Connect to each character signal input terminal of a) to (53f),
This slave controller (56) uses four types of message sources (45), (55) when transmitting messages.
, (57).

and (58), the character signal inputted from one type of message source is supplied to these superimposing circuits (53a) to (53f). Further, (61) is a junction box provided in the video control unit (52), and character signals generated from each of the superimposing circuits (53a) to (53f) are superimposed on this junction box (61). Video signals are supplied to the junction box (61), and audio signals from video tape recorders (1b) to (ld), a still image player (3), etc. (not shown) are also supplied to the junction box (61). This junction box (61) converts the input video signal, audio signal, and audio signal from the microphone (5a) into control data 5C input from the slave controller (56).
ffi and send it to the modulator/demodulator (11).

This modulator/demodulator (11) is the modulator (l) in the conventional example shown in FIG.
la) to (l1g) (l1g), an adder (12), and a duplexer (13) may be considered to be included.

Further, in this example, the terminal device (30) includes a television tuner (33), a selection display device (35), and a personal computer (37). This is centrally controlled (
20) shows the minimum configuration for receiving messages transmitted from .

To explain the operation of this example, during normal operation when there is no need to send messages to each terminal device (30), the slave controller (56) is operated by operating the operating keyboard (59).
) sets the output of the character signal output terminal to O level. In this case, video signals output from video tape recorders (lb) to (ld) etc. are superimposed circuits (53a) to (53f).
), and each terminal device (30
) allows you to view the image corresponding to the original video signal.

In addition, from the central control device (20) side to each terminal device (30)
If you wish to convey departure/arrival times, meal menus, franchise information, duty free product information, special news, or other messages, operate the operating keyboard (59) and press the character signal output terminal of the slave controller (56). Increase output. At this time, from the operation keyboard (59), you can select four types of message sources, namely the electronic camera (
54), message keyboard (55), telopper (57), and internal ROM (58).

Indicates which message source from which character signal is to be selected. By doing this, the character signals from the desired message sources are superimposed on the video signals output from the video tape recorders (1b) to (1d), etc. in the superimposing circuits (53a) to (53f), respectively. , regardless of which channel the video signal is being received by each terminal device (30), messages are displayed superimposed on the image.

As described above, this example has the advantage of being able to transmit messages to each terminal device (30) without using the override function. Furthermore, for example, by using a message keyboard (55) or an electronic camera (54), the contents of the message to be transmitted can be easily changed, and the system is inexpensive and does not require special equipment such as a data downloader. There is an advantage in message transmission.

Further, the video signal transmission device of this example includes a superimposing circuit (53a
) ~ (53f), electronic camera (54), telopper (
Since it can be configured by simply combining or modifying commercially available devices such as No. 57), it has the advantage of being easy to manufacture and easy to maintain and inspect.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that changes can be made without departing from the gist of the present invention.

H Effects of the Invention As described above, the in-vehicle video signal transmission device according to the present invention is provided with a means for superimposing a character signal on a video signal, so messages can be transmitted to passengers at any time even without an override function. There are profits that can be made.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an in-vehicle video signal transmission device of the present invention, and FIG. 2 is a block diagram showing a conventional information signal transmission device. (20) is the central control unit, (30) is the terminal device, (53
a) to (53f) are superimposing circuits, (54) is an electronic camera, (55) is a message keyboard, (57) is a telopper, and (58) is an internal ROM. Agent Sadado Ito Hidemori Matsukuma

Claims (1)

[Scope of Claims] A video signal transmission device in a vehicle that transmits video signals from a central control device to a plurality of terminal devices respectively arranged in a plurality of seats, a character signal that generates a character signal on the side of the central control device. 1. A video signal transmission device in a vehicle, comprising a generating means, a means for superimposing the character signal on the video signal, and a means for modulating the video signal on which the character signal is superimposed.