JPS63217784A - Video signal transmitter - Google Patents

Abstract

PURPOSE:To execute a simultaneous broadcasting to all terminal equipments and to effectively receive information in the seat of an aircraft or the like by superimposing a prescribed discriminating signal on the vertical or the horizontal blanking period of a video signal transmitted from a central control unit at a prescribed time, detecting the discriminating signal in the terminal equipment and switching to a prescribed channel. CONSTITUTION:The terminal equipment 30 having individually a discriminating signal detecting part 33b and a selection display device 35a is disposed in the seat for a passenger of the aircraft or the like. Plural video tape recorders 1a-1d, sound reproducing machines 4a, 4b, a tuner 2, a still picture reproducing machine 3, CADA encoders 6, 7 or the like are connected to the controller 5 of the central control unit of a crew's room or the like. This encoder 6 is controlled by a control signal from a master controller 8 and the encoder is controlled by processing a signal 10. The prescribed control signal of the vertical and the horizontal blanking period of the video signal transmitted from the central control unit is detected in the detecting part 33b of the terminal 30 to switch to the prescribed channel and simultaneously select and display the sound broadcasting.

Description

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

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem (Fig. 1) F. Effect G. Embodiment G1 Explanation of transmitting side G2 Receiving side Description H Effect of the Invention A Industrial Application Field The present invention transmits a plurality of video signals in parallel to a video display device individually installed in or near a passenger seat in, for example, an aircraft train or a lotus train. The present invention relates to a video signal transmission device suitable for use in.

B. Summary of the Invention The present invention provides a video signal transmission device that connects a central control device to a terminal device separately provided in or near a passenger seat of an aircraft, train, bus, etc. so that video signals can be transmitted therefrom. , a predetermined discrimination signal is superimposed on the vertical blanking period or the horizontal blanking period of the video signal sent from the central control device at a predetermined time, and the terminal device is provided with means for detecting this discrimination signal, and this discrimination signal detection means detects the discrimination signal. By switching to a predetermined channel when it is detected, it is possible to reliably and forcefully receive the predetermined channel with a simple configuration.

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

D Problems to be solved by the invention By the way, there are times when it is necessary to notify all passengers at once in an airplane before takeoff, etc., by using a video display installed in each seat. It is requested that it be made public.

However, if the above-mentioned video display were to be able to receive the same broadcast all at once regardless of the operation of each passenger, the configuration would become complicated.

In view of the above, an object of the present invention is to provide a video signal transmission device that can reliably perform simultaneous broadcasting with a simple configuration.

E. Means for Solving the Problems The video signal transmission device of the present invention is configured by connecting a central control device to a terminal device (30) so as to be able to transmit video signals, as shown in FIGS. 1 to 3, for example. In the video signal transmission device, a predetermined discrimination signal is superimposed on the vertical blanking period or the horizontal blanking period of the video signal sent from the central control device at a predetermined time, and the terminal device (30) is provided with detection means (33b) for the discrimination signal. This discrimination signal detection means (33b
) detects a discrimination signal and switches to a predetermined channel.

F Function According to the present invention, when the detection means (33b) detects the discrimination signal superimposed on the video signal, the channel is switched to a predetermined channel. This can be done simply by superimposing the discrimination signal on the video signal, and forced reception can be performed easily and reliably.

G. Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. This example is a video signal inside an aircraft.

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

Description of the G1 Transmitting Side In FIG. 3, (1a) to (1d) are video tape recorders on the transmitting side corresponding to a central control unit installed in a crew cabin or the like. The videotape recorder (1a) is for override use, and is loaded with a cassette tape in which information on how to put on a life jacket, etc. is recorded. Further, video tape recorders (1b) to (1d) are loaded with cassette tapes on which movies are recorded. These video tape recorders (1a) to (1d) have a terminal V to which a reproduced video signal is output, a terminal to which a reproduced audio signal is output,
R.

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

Further, (2) is a television tuner, and this television tuner (2) is provided with a terminal V 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, which plays compact discs, so-called CDs, on which maps, airport guide maps, etc. are recorded.
It is designed to play ROM. This still image reproducing device (3) is provided with a terminal V to which a still image video signal is output, and a terminal A to which an audio signal is output.

Further, (4a) and (4b) are audio playback machines each 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 volume that adjusts the level of the audio signal from the microphone (5a), (5c) is an announce key, (5d) is an override key, (5e)～
(5g) are video tape recorders (1b) to (1d), respectively.
) is a pause key to put the cursor into a pause state. Video signals obtained at terminals V and audio signals obtained at terminals R and A of the video tape recorders (1a) and (1b) are respectively supplied to a control device (5). The control device (5) is provided with an output terminal V for a video signal and an output terminal R, A for an audio signal, and these output terminals V
A video tape recorder (1b
), the video signal obtained at terminal V and the audio signal obtained at terminals R and A are output, but if the override key (
When pressing 5d) to turn on the override, the video signal obtained at terminal V and the audio signal obtained at terminals R and A of the video tape recorder (1a) are output. At this time, a predetermined pulse signal P is superimposed several times (for example, twice) during the vertical blanking period VB on the video signal output from the override video tape recorder (1a), as shown in FIG. shall be taken as a thing. Further, when the announce key (5c) is pressed to turn on the announcement, an audio signal from the microphone (5a) is output to the output terminal A.

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

A CADA 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 it is possible to multiplex not only digital audio (but also control data and data for computer software).

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

The audio signal obtained at A is supplied to an encoder (6). In addition, the audio signals obtained at the output terminals R and A of the video tape recorders (1c) and (ld) are sent 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, the audio signals obtained at 6 pairs of output terminals of the audio player (4a), 3 pairs of output terminals of R and the audio player (4b), and H are transmitted to the encoder (6) via the control device (5). ) and (7).

In addition, the override key of the control device (5)
(5d), announce key (5c), pause key (
When keys 5e) to 5g are pressed, the control device (5) generates control data SC1 corresponding to the pressed key, and this control data SC1 is supplied to the encoder (6).

And the encoder (6) has control data SC.
Output terminals A to G are provided to which control signals are output corresponding to the output terminals A to G, and the control signals obtained at these output terminals A to G control the video tape recorders (1b) to (ld), respectively.
Tuner (2), still image player (3), audio player (
4a) and (4b) are controlled. For example, when the override key (5d) is pressed, an override control signal is output from output terminals AG. This override control signal is applied to video tape recorders (1b) to (l).
d) When supplied to the tuner (2) and still image player (3), the video signals output from each device include:
As shown in FIG. 2, it is assumed that a predetermined pulse signal P is superimposed several times (for example, twice) during the vertical blanking period VB. Also, when the override control signal is supplied to the audio playback devices (4a) and (4b), the audio playback device (4a)
and (4b) are in a pause state.

In addition, the announce key (5c) of the control device (5)
) is pressed, an announcement control signal is output to output terminals A-G. When this announcement control signal is supplied to the video tape recorders (1b) to (1d), the tuner (2), the still image player (3), and the audio players (4a) and (4b), each device pauses. become a state.

In addition, the pause key (5e) of the control device (5)
When (5g) is pressed, a pause control signal is output from each of the output terminals A to C, and the corresponding video tape recorders (1b) to (1d) enter a pause state, respectively.

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) to (9h)
Computer software data S read out from
D 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 SCI and SC2 are also supplied from the encoder (6) to the encoder (7).

Further, the output terminal 0 of the encoder (6) is supplied with a signal 5c which is a digitally converted signal of the plurality of supplied audio signals and a time-division multiplexed signal of the control data SC1 and SC2.
A1 is obtained, and this signal 5CAI is passed through the m transformer (llf)
and is AM modulated using the VSB (vestigial sideband) method. Further, at the output terminal O of the encoder (7), a signal Sc^2 obtained by digitally converting the plurality of supplied audio signals, time-division multiplexed control data SC1, SC2, and computer software data SD is obtained. This signal 5CA2 is supplied to a modulator (Ilg) and subjected to AM 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
AM modulated using the SB method.

Also, video tape recorders (LC), (LD)
.

Output terminal V of tuner (2) and still image player (3)
The video signals obtained in
ie) and AM modulated using the VSB method.

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

Further, the output signals of the modulators (Ila) to (I1g) are supplied to an adder (12) and frequency-multiplexed. The frequency-multiplexed signal SMF from the adder (12) is supplied via a duplexer (13) to one end of a leaky cable (21) constituting a bidirectional signal transmission means. The other end of this leaky cable (21) is connected to a terminating resistor (22) for termination. This leaky cable (21) is, for example, a coaxial cable with a spiral cutout around it to increase the amount of signal leakage.

Explanation of G2 Receiving Side Further, (30) is a terminal device provided individually in the passenger seat of the aircraft, and only one terminal device is shown in FIG. In this terminal device (30), (31) is an antenna for capturing the frequency multiplexed signal SMF 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 CADA tuner (34) via a splitter (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 (
Channel selection in 33) 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, 5CA2 is supplied to the CADA decoder (36). The CADA decoder (36) is configured to operate almost in the opposite manner to the above-mentioned CADA encoder (61, fil), and outputs the control data SC1, SC2 and the selection display device (3) from the time division multiplexed signal 5CAI or 5CA2.
5) A desired audio signal and data for computer software are extracted. That is, the CADA decoder (36) is configured with a shift register and a D/A converter, and the time division multiplexed signal 5CAI or 5CA2 is serially input to the shift register, and the control data SC1, SC2 is taken out in parallel, and desired audio signals and computer software data SD are also taken out in parallel from predetermined positions of the shift register under the control of the selection display device (35).

In this case, the audio signal is converted into an analog signal via a D/A converter. This D/A converter has two
Since two pieces are used, two pieces in total are sufficient. The audio signal extracted by this CADA decoder (36) is supplied to a selection display device (35). Also, this CADA decoder (
The computer software data SD retrieved at step 36) is supplied to the personal computer (37) and written into the RAM.

Further, FIG. 4 shows an example of the structure of the panel surface of the selection display device (35), and this panel surface is arranged on the back of the passenger seat as shown in FIG.

In FIG. 4, (35a) is a display device consisting of a flat cathode ray tube, liquid crystal display, etc., (35b) is an audio output terminal to which a hesodophone (35c) is connected, and (35d) is an audio output terminal.
is a joystick (35e) etc. for games (3rd
(see figure) is the game terminal to which it is connected.

Also, (35f) is the TV selection key, (35g) is the music selection key, (35h) is the channel display, (35i
) is the channel down key, and (35j) is the channel amplifier key. In this case, use the TV selection key (35f
), then press the channel down key (35i) and the channel up key (35j) in sequence to change the television channel in sequence. That is, the reception channel at the TV tuner (33) and the CADA decoder (
36) The audio signal output from the display device (
35a) includes video tape recorders (1b) to (ld).
), the tuner (2), and the still image player (3) are sequentially displayed on the screen, and the corresponding audio signals are output to the audio output terminal (35b). Here, when there are audio signals in two languages, two channels are assigned to one video signal screen, and the first
The channel outputs an audio signal in the language of the first country, and the second channel outputs an audio signal in the language of the second country. Also, press the music selection key (35g >) and press the channel down key (35i) and channel up key (35i).
By pressing 35j) in sequence, the music channels can be changed in sequence. That is, the audio signal output from the CADA decoder (36) is changed, and the audio signal output terminal (35b)
There is an audio playback tM (4a).

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

Further, (35k) is a menu display key, (354') is a cursor down key, (35m) is a cursor up key, and (35n) is an enter key. In this case, by pressing the menu display key (35k), a video signal based on data from the menu ROM (9a) is supplied from the personal computer (37) to the selection display device (35), and the menu is displayed on the display device (35a). The screen will be displayed. Then, select a game by moving the cursor on the display screen using the cursor down key (351) and cursor up key (35m), and then press the enter key (35n).
) by pressing the personal computer (37)
The video signal and audio signal based on the data from the game ROM (9b) to (9h) selected by the selected display device (
35), the game screen is displayed on the display device (35a), and the game audio signal is outputted to the audio output terminal (35b).

Further, in FIG. 4, (35p) is a stewardess call key, (35q) is a reading light key, and (35r) is a volume control.

Also, based on the control data SC1 and SC2 taken out by the CADA decoder (36), the data is transferred to the CAD eight decoders.
A selection display device (35) and the like are controlled by a CPU (not shown) in the computer (36). For example, the override key (5) of the control device (5) on the central control device side
When d) is pressed to turn on the override,
CAD supplied via CAD^ encoder (6)
The CAD of the terminal device (30) indicates that this override is on based on the control data SC1 that is data.
Detected by the A decoder (36).

When this CADA decoder (36) detects that the auto marride is on, the TV tuner (33) receives the video signal from the override video tape recorder (1a) modulated by the modulator (lla) on the central control unit side and A channel selection signal is supplied for receiving a channel from which an audio signal can be obtained. This TV tuner (33) is
As shown in FIG. 1, the tuner section (33a) has a tuner section (33a) and a discrimination signal detection section (33b), and the video signal and audio signal obtained from the branching filter (32) side to the input terminal (33c) are transmitted to the tuner section (33a). ), and the above-mentioned tuning signal is supplied to the tuner section (33a).
When a tuning signal due to override-on is supplied to the tuner section (33a), the tuner section (33a) turns on the modulator (lla).
), the display device (35a) of the selection display device (35) displays an image based on the video signal output from the output terminal V of the video tape recorder (la), and the audio The output terminal (35b) is adapted to receive an audio signal to be output to the output terminal A of the video tape recorder (1a).

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

In addition, the transmission device of this example uses the CA of each terminal device (30).
Even when the DA decoder (36) does not function due to a failure etc.
When the override is turned on, a signal from the override video tape recorder (1a) is received. In other words, when override is on, all video signals supplied from the central control unit, that is, the video tape recorder (
1a) to (1d), tuner (2), and still image player (
As shown in FIG. 2, a pulse signal P is superimposed on the video signal supplied from 3). The discrimination signal detection section (33b) of the television tuner (33) is a circuit that detects the pulse signal P during this vertical blanking period, and when the discrimination signal detection section (33b) detects this pulse signal P, the tuner section (33b) detects the pulse signal P during the vertical blanking period. 33a) is supplied with a tuning signal for receiving a channel in the output frequency band of the modulator (lla). When this channel selection signal is supplied to the tuner section (33a), the above-mentioned CA
Similarly to when the tuning signal is supplied from the DA decoder (36),
The channel of the output frequency band of the modulator (lla) is in the receiving state, and the display device (35a) of the selection display device (35)
An image based on the video signal output from the output terminal V of the video tape recorder (1a) is displayed, and an audio signal output from the output terminal A of the video tape recorder (la) is displayed on the audio output terminal (35b). be done as it is done.

In this way, even when the CADA decoder (36) does not function, forced reception by override-on is performed.

In addition, the override key (5d) and the announce key (
When 5c) is pressed again to turn override off and announcement off, the above-mentioned control is canceled and the original state is automatically restored. At this time, the superposition of the pulse signal P as shown in FIG. 2 also stops at the same time. Further, when the reception state is forcibly controlled in this way, the channel indicator (35h) displays that it is different from the normal state. In this case, a dedicated display may be provided.

Furthermore, the brightness of the display device (35a) is controlled based on the control data SC2, and the brightness is automatically adjusted to match the brightness of the room. In addition, control data SC2
When requesting data, the CPU of the CADA decoder (36) generates data indicating the status of the selected display device (35) and data indicating the status of the seat belt, reclining, etc. detected by the sensor (39). be done. This data is supplied to the transmitter (38), modulated to a frequency other than the output frequency band of the modulators (Ila) to (Ilg), and then demultiplexed! (32) and antenna (31
) is supplied to the leaky cable (21). Then, this data is transmitted from the leaky cable (21) to the CAI) A encoder (6) on the transmitting side via the duplexer (13).
) from this CADA encoder (6) to the master controller (8) for use.

Also, when the steward desk call key (35p) of the selection display device (35) is pressed, the CADA decoder (36)
Control data is generated by the CPU. This data is supplied to a transmitter (38), modulated, and then supplied to a leaky cable (21) via a duplexer (32) and an antenna (31). This data is then supplied from the leaky cable (21) via the duplexer (13) to the CADA encoder (6) on the transmitting side. and,
Based on this data, the CP in the CADA encoder (6)
U (not shown) controls the switch box (40) so that the corresponding stewardess call light (41) is illuminated. In addition, a selection display device (35)
When the reading light key (35q) is pressed, control data is generated by the CPU of the CAD header (36). This data is supplied to a transmitter (38), modulated, and then supplied to a leaky cable (21) via a duplexer (32) and an antenna (31). Then, this data is sent to the duplexer (13) from the leaky cable (21).
is supplied to the CAD^ encoder (6) on the transmitting side.

Then, based on this data, a CADA encoder (6)
The switch box (40) is controlled by the CPU in the switch box (40), and the corresponding reading light (42) is made to emit light.

In this way, according to this example, a plurality of video signals, audio signals, etc. are frequency multiplexed on the transmitting side, and the leaky cable (21
) to the terminal device (30) on the receiving side, and also to the CADA decoder (3) of the terminal device (30) on the receiving side.
Since the data from 6) is supplied to the transmitting side via the leaky cable (21), the apparatus can be simplified.

Further, according to this example, the audio signal is sent to the CAD^ encoder (6
).

(7), the music is transmitted as a digital signal, so each terminal device (30) on the receiving side can listen to music with good sound quality.

According to the transmission device of this example, when the override is turned on, forced broadcast reception is performed by the CADA decoder (36) discriminating CADA data, and the television tuner (33) includes a discriminating signal detecting section (33b) detecting the broadcast. Therefore, even if the CADA decoder (36) fails, for example, the signal from the video tape recorder (la) is forcibly received by detecting the pilot signal in the discrimination signal detection section (33b). Therefore, instructions on how to put on a life jacket before takeoff of an airplane equipped with this transmission device are reliably provided at each terminal device (30). In addition, forced reception based on the discrimination signal is possible using a TV tuner (3
3), the configuration is simple because only the discrimination signal detection section (33b) is provided.

In the above-described embodiment, the pulse signal P as a discrimination signal is superimposed on the vertical blanking period of the video signal, but it goes without saying that the empty portion of the video signal equalized during the horizontal blanking period may also be used. Further, although the above-mentioned embodiments apply the present invention to an information transmission device inside an aircraft, it can be similarly applied to an information transmission device inside a vehicle such as a train or a bus, or inside a theater or an M-studio hall. Further, the above embodiment is a terminal device (
30) is provided on the back side of the seat, but it may also be provided near the seat, such as on an armrest, a table attached to the seat, or the like. 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 video signal transmission device of the present invention, all terminal devices (
30), it can be done by simply superimposing a predetermined discrimination signal on the video signal, which has the advantage of making it possible to easily and reliably receive the video signal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the main parts of an embodiment of the video signal transmission device of the present invention, FIG. 2 is a diagram for explaining the example in FIG. 1, and FIG. 3 shows the entire embodiment. The configuration diagram, FIGS. 4 and 5 are diagrams for explaining the example shown in FIG. (1a) to (1d) are video tape recorders, (2) is a television tuner, (3) is a still image player, (4a) and (4b) are audio players, (5) is a control device,
(6) and (7) are CAD eight-ecoder, (8) is master controller, (9a) to (9h) are ROM, (
lla) to (l1g) are modulators, (12) is an adder, (13) and (32) are duplexers, (21) is a leaky cable, (30) is a terminal device, (31) is an antenna, ( 33) is a TV tuner, (33a) is a tuner section, (33b) is a discrimination signal detection section, (34) is a CADA tuner, (35) is a selection display device, (35p) is a stewardess call key, and (35q) is a reading device. Light key, (3
6) is a CAD header, (37) is a personal computer, and (38) is a transmitter.

Claims (1)

[Scope of Claims] In a video signal transmission device in which a central control device is connected to a terminal device so that video signals can be transmitted, the vertical blanking period or the horizontal blanking period of the video signal sent from the central control device at a predetermined time. A video signal transmission characterized in that a predetermined discrimination signal is superimposed on the terminal device, a detection means for the discrimination signal is provided in the terminal device, and when the discrimination signal detection means detects the discrimination signal, switching to a predetermined channel is performed. Device.