JPH06187771A - Video equipment control apparatus and method - Google Patents

Abstract

PURPOSE:To simplify the processing of wiring by modulating a control signal controlling a first or a second video equipment to a signal in the RF band of a video signal by a controller and outputting the signal to the first or the second video equipment through a signal line. CONSTITUTION:A video equipment controller is provided with a VTR 32 as the first video equipment outputting the video signal and the controller 31 connected with the VTR 32 and an LDP 33 through the signal lines 11, 12 respectively. Then, by the controller 31, the control signal controlling the VTR 32 or the LDP 33 is modulated to the signal in the RF band of the video signal to be outputted to the VTR 32 or the LDP 33 through the signal lines 11, 12. In such a case, the wiring becomes simple and erroneous connection is prevented since the lines for the video signal are shared in the connection with the video equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video equipment control apparatus suitable for use in, for example, an AV system.

[0002]

2. Description of the Related Art FIG. 10 is a block diagram showing a configuration of an example of a conventional AV system. A VTR 2 and an LDP (laser disc player) 3 are connected to the controller 1 via signal lines 11 and 12. VTR2 and LDP3
The video signal reproduced from a magnetic tape or a video disk (neither is shown) is supplied to the controller 1 via the signal lines 11 and 12. The controller 1 selects one of the video signals and
It is designed to be output to the CRT 4 via. Also,
The VTR2 is connected to the controller 1 via the control line 14, the LDP3 is connected to the control line 15 and the LDP3, and further the control line 1 is connected.
It is connected to the controller 1 via 4. The commander 5 generates an infrared signal corresponding to a user's operation and inputs a predetermined command to the controller 1.

However, when the commander 5 is operated to instruct the reproduction of the LDP 3, for example, the controller 1 outputs the reproduction command of the LDP 3 to the control line 14. This command is input to the VTR 2 via the control line 14 and to the LDP 3 via the control line 15, respectively. Since the command is given an ID, this command is V
It is not accepted by TR2 but only by LDP3. When this command is input, the LDP3 starts playing the video disc. Then, the signal reproduced from the video disk by the built-in head (not shown) is output to the controller 1 through the signal line 12. The controller 1 supplies this video signal to the CRT 4 for display.

[0004]

Since the conventional device is designed to control the VTR2, LDP3 and the like via the control lines 14 and 15 as described above, there is a problem that the wiring becomes complicated.

Further, the conventional device has a problem in that the use efficiency of the control line, that is, the bus is lowered because it is necessary to add address information to the command to each device.

The present invention has been made in view of such a situation, and a first object thereof is to simplify wiring.

A second object of the present invention is to eliminate the need to add address information to a command or control signal to each device.

[0008]

According to a first aspect of the present invention, there is provided a video equipment control device comprising a VTR 32 as a first video equipment for outputting a video signal and an LDP 33 as a second video equipment for outputting a video signal. , VTR 32 and LDP 33, and a controller 31 connected via signal lines 11 and 12, respectively.
It is characterized in that a control signal for controlling 2 or LDP 33 is modulated into a signal in the RF band of a video signal and output to VTR 32 or LDP 33 via signal lines 11 and 12.

According to a second aspect of the present invention, there is provided a video equipment control device which is a VTR 32 as a first video equipment for outputting a video signal.
And an LDP as a second video device that outputs a video signal
33, and a controller 31 connected to the VTR 32 and the LDP 33 via signal lines 11 and 12, respectively. The controller 31 is a VTR 32 or an LDP.
A control signal for controlling the signal 33 is modulated into a signal in the base band of the video signal, and the VTR is transmitted via the signal lines 11 and 12.
32 or LDP33.

A video equipment control apparatus according to a third aspect of the present invention is a video equipment (for example, the first VTR 130 and the second VTR in FIG. 6).
140 or LDP 150) and frequency-multiplexed with a control signal (for example, a control signal on the control line 121 in FIG. 6) and a video signal to be sent to a video device (for example, a video signal output from the switch 118 in FIG. 6). It is characterized in that it is provided with a multiplexing means (for example, the frequency division multiplexing discrimination circuit 119 of FIG. 6).

A video equipment control method according to a fourth aspect of the present invention is a video equipment (for example, VTR 32 or LDP 33 in FIG. 1).
Is sent during a predetermined horizontal scanning period in the vertical synchronizing section of the video signal sent to the video equipment.

[0012]

In the video equipment control apparatus having the structure according to claim 1 or 2, the control signal is a signal in the RF band or the base band of the video signal, and is sent to the VTR 32, LDP 33 or the like via the signal lines 11 and 12. Supplied. Therefore,
No control line is required and wiring process is simplified.

In the video equipment control device of the third aspect, the control signal for the video equipment and the video signal to be sent to the video equipment are frequency-multiplexed. Therefore, the line for the video signal and the line for the control signal can be made common, so that the wiring is simple and erroneous connection can be prevented.

In the video equipment control method according to the fourth aspect of the present invention, the control signal for the video equipment is sent during a predetermined horizontal scanning period in the vertical synchronization section of the video signal sent to the video equipment. Therefore, in connection with the video equipment, the video signal line and the control signal line can be made common, so that the wiring can be simplified and erroneous connection can be prevented. Further, it is not necessary to add the address information to the control signal, so that the use efficiency of the line for transmitting the video signal and the control signal can be improved.

[0015]

FIG. 1 is a block diagram showing the configuration of an embodiment of a video system to which the video equipment control apparatus of the present invention is applied, and parts corresponding to those in FIG. However, the description thereof will be repeated and thus will be omitted as appropriate. As shown in the figure, the controller 31 is connected to the VTR 32 and the LDP 33 via the signal lines 11 and 12. The control lines 14 and 15 in FIG. 10 are not provided. Other configurations are the same as those in FIG. However, the controller 31 incorporates the circuit shown in FIG. 2, and the VTR 32 and the LDP 33 incorporate the circuit shown in FIG.

In FIG. 2, the CPU 41 receives an input of a signal corresponding to infrared rays incident from the commander 5 as a light receiving unit 40.
It is supposed to be received from. Then, the signal corresponding to the received command is output to the generation circuit 42. The generation circuit 42 generates a control signal corresponding to the input command and outputs it to the modulation circuit 43. The modulation circuit 43 modulates the control signal input from the generation circuit 43 and selects the selection circuit 44.
Output to. The selection circuit 44 is controlled by the CPU 41 and outputs a signal to the signal line 11 or 12.

Further, in FIG. 3, the separation circuit 51 separates the control signal component from the signal input from the signal line 11 or 12 and outputs it to the demodulation circuit 52. The demodulation circuit 52 performs demodulation corresponding to the modulation of the modulation circuit 43 in FIG. The reading circuit 53 reads the output of the demodulation circuit 53 and outputs the read result to the CPU 54.

Next, the operation will be described. For example, when the commander 5 issues an instruction to reproduce the LDP 33, the infrared command is received by the light receiving unit 40. CPU4
1 receives the command input from the light receiving unit 40,
The generation circuit 42 is controlled to generate a control signal necessary for the LDP 32 to perform a reproducing operation. This control signal is input to the modulation circuit 43 and is modulated by a predetermined method.

4 and 5 show an example of this modulation method. In the example of FIG. 4, in the base band of the video signal, the color signal component is arranged in a frequency band higher than the luminance signal component, and the audio signal component is arranged in a band higher than that. Then, the modulation circuit 43 modulates the control signal input from the generation circuit 42 so as to be arranged in a frequency band higher than the audio signal. In the embodiment shown in FIGS. 2 and 3, the control signal is supplied only from the controller 31 in the direction of the VTR 32 or the LDP 33 and is not supplied from the VTR 32 or the LDP 33 in the direction of the controller 31.
Alternatively, the control signal may be supplied from the LDP 33 to the controller 31. That is, in this case, the control signal is supplied bidirectionally. In this case, the frequency band of the control signal is made slightly different for transmission and reception.

Alternatively, as shown in FIG. 5, when the channels CH1 to CH12 exist in the RF band of the video signal, the control signal transmission and reception channels are in the higher (or lower) frequency band than this. CR, CS
May be provided.

VTR 32 and LDP 3 are connected to the signal lines 11 and 12.
When the video signal output from 3 is in the base band, the method of FIG. 4 is adopted, and when it is in the RF band, the method of FIG. 5 is adopted.

As described above, the control signal modulated into the signal in the band of the video signal is supplied to the selection circuit 44. Since the command for reproducing the LDP 33 has been input, the CPU 41 controls the selection circuit 44 to output a control signal to the signal line 12. Of course, when the ID is added and the control signal is output, the selection circuit 44 is omitted, the control signal is output to both the signal lines 11 and 12, and the command input by the VTR 32 or LDP 33 is changed. It can be accepted or not accepted.

In the LDP 33, the separation circuit 51 separates the control signal component from the video signal input from the signal line 12 and outputs it to the demodulation circuit 52. The demodulation circuit 52 demodulates the control signal component and outputs it to the reading circuit 53. The reading circuit 53 reads the input control signal and outputs the reading result to the CPU 54. The CPU 54 analyzes the input control signal and starts the reproduction of the video disc.

In the above, the case where the VTR and the LDP are controlled as the video equipment is taken as an example, but the present invention can be applied to the case where other video equipment is controlled.

FIG. 6 is a block diagram showing the configuration of an embodiment in which the present invention is applied to an AV system. When the operation button 101 is operated, a predetermined command can be input to the CPU 104 via the interface 103. Similarly, if the commander 112 is operated, the commander 112
More infrared rays are emitted, and the infrared rays are received by the receiving unit 102. As a result, the receiving unit 102 can also input a predetermined command to the CPU 104 via the interface 103. The CPU 104 processes the input command and outputs a tuning command to a tuner (not shown), a command to the D2B communication processing microcomputer 109 described later, and the like.

The ROM 105 stores programs and data necessary for the CPU 104 to operate. The RAM 106 stores data obtained as a result of processing. The non-volatile memory 107 stores data that needs to be stored even after the power is turned off, such as other AV equipment (VTR).
Store connection information with 130 and 140 and LDP 150). The clock timer 108 constantly performs a time counting operation and generates time information.

CPU 104, ROM 105, RAM 10
6 and the clock timer 108 constitute a main microcomputer for controlling a television receiver (hereinafter, abbreviated as "TV microcomputer").

A D2B communication processing microcomputer (hereinafter referred to as "D
2B communication processing microcomputer "is abbreviated) 109 is the internal bus 1
20 is connected to the CPU 104, the screen display IC 114, and the switching device 118 via 20 and is connected to the frequency division multiplexing discrimination circuit 119 via the D2B communication processing IC 110 and the D2B control line 121 to exchange data and commands. Is configured to do.

The first VTR 130 is connected to the frequency division multiplexing discrimination circuit 119 via the AV signal line 131 and the AV input / output terminal T1 so that the video signal and the audio signal can be transmitted / received to / from the circuit 119. Has become. The second VTR 40 is connected to the AV signal lines 141 and A.
Frequency multiplexing discrimination circuit 119 via V input / output terminal T2
The video signal and the audio signal can be transmitted and received to and from the circuit 119. L
The DP 150 is connected to the frequency multiplexing discrimination circuit 119 via the AV signal line 151 and the AV input / output terminal T3,
A video signal and an audio signal can be transmitted / received to / from the circuit 119.

The video test signal generator 122 supplies the video test signal to the switch 118. The video test signal detector 124 detects the video test signal output from the switch 118. First VTR 130, second VTR
140 and LDP 150 also include a video test signal generator 132 and a video test signal detector 13, respectively.
4, video test signal generator 142 and video test signal detector 144, and video test signal generator 1
52 and a video test signal detector 154 are provided.

The switch 118 outputs one of a video signal output from a tuner (not shown) and a video signal output from the frequency division multiplexing discrimination circuit 119.
It is selected under the control of the CPU 104 or the D2B communication processing microcomputer 109 and output to the CRT 113 and the video test signal detector 124.

Also, the switch 118 processes either the video signal (and audio signal) output from the tuner (not shown) or the video signal output from the video test signal generator 122 by the CPU 104 or D2B communication processing. It is selected under the control of the microcomputer 109 and supplied to the frequency division multiplexing discrimination circuit 119.

The CRT 113 displays the video signal from the switch 118. Further, on the CRT 113, for example, information supplied from the communication processing microcomputer 109 via the internal bus 120 and the screen display IC 14 is displayed. The audio signal output from the switch 118 is reproduced by a speaker (not shown).

The frequency division multiplex discrimination circuit 119 has a D2
A predetermined frequency band is assigned to the data and the command, that is, the D2B control signal supplied via the B control line 121, and the switch 118 outputs the first VTR 130 and the second VTR 130 to the second VTR 130.
The audio signal and the video signal (including the test video signal) output to the VTR 140 or the LDP 150 are multiplexed, and the AV input / output terminals T1 and T1, respectively.
Output to T2 or T3. In addition, the frequency division multiplexing discrimination circuit 119 includes a first VTR 130 and a second VTR 140.
Alternatively, from the LDP 150, the AV signal line 131,
141 or 151 and AV input / output terminals T1 and T2
Alternatively, it receives a frequency-multiplexed audio signal and video signal (including a test video signal) and a D2B control signal supplied via T3, and discriminates the audio signal and the video signal from the D2B control signal. The signal and the video signal are output to the switch 118, and the D2B control signal is output to the control lines 121 and D2B.
D2B communication processing microcomputer 1 via communication processing IC 110
Supply to 09.

The operation button 101, the receiver 102, the interface 103, the CPU 104, the ROM 105, and the R shown in FIG.
AM 106, non-volatile memory 107, clock timer 1
08, D2B communication processing microcomputer 109, D2B communication processing IC 110, CRT 113, screen display IC 110, switch 118, frequency division multiplexing discrimination circuit 119, video test signal generator 122, video test signal detector 12
4, tuner (not shown) and speaker (not shown)
Constitutes the AV center, that is, the television receiver 100.

The first VTR 130 and the second VTR 14
0 and LDP150, D2B communication processing microcomputer 1
09, D2B communication processing IC 110, control line 121, and components corresponding to frequency division multiplexing discrimination circuit 119 are provided.

FIGS. 7, 8 and 9 are flowcharts showing the first part, the second part and the third part of an example of the connection setting initialization operation of the embodiment of FIG. First, when the operation button 101 or the initialization button of the commander 112 is pressed, the AV
The D2B communication processing microcomputer 109 of the center 100
After issuing a video test signal detection operation instruction to the first VTR 130 via the 2B communication processing IC 110, the D2B control line 121, the frequency division multiplexing discrimination circuit 119, the AV input / output terminal T1 and the AV signal line 131, the switcher 11
8 is controlled to output the video test signal generated from the signal generator 122 from the switch 118, and the video test signal is output to the first VTR 130 via the frequency division multiplexing circuit 119, the AV input / output terminal T1, and the AV signal line 131. A test signal is supplied (step S11).

Next, the D2B communication processing microcomputer 109
Whether or not the video test signal detector 134 of the first VTR 130 has detected the video test signal is determined by the D2B protocol by the D2B control line 121 and the frequency division multiplexing circuit 11.
9, inquires of the first VTR 130 via the AV input / output terminal T1 and the AV signal line 131 (step S1).
2). When the signal detector 134 detects the video test signal (YES in step S13), the first VTR 130 receives the video test signal.
In the D2B protocol, D2 via the AV signal line 131, the AV input / output terminal T1, the frequency division multiplexing discrimination circuit 119, the D2B control line 121, and the D2B communication processing IC 110.
The signal detection is reported to the B communication processing microcomputer 109. Accordingly, the D2B communication processing microcomputer 109 determines that the AV center, that is, the AV input / output terminal T1 of the television receiver 100 is connected to the first VTR 130,
OSD (on-screen display) of CRT113
The first VTR is displayed in the T1 device column of the
The name is given to TR130 by the D2B protocol and D2B.
The first VTR via the control line 121, the frequency division multiplexing circuit 119, the AV input / output terminal T1 and the AV signal line 131.
130, and the result is displayed on the screen display IC 114.
It is displayed in the OSD name column of the CRT 113 via (step S14).

When there is no signal detection response from the first VTR 130 (NO in step S13), the D2B communication processing microcomputer 109 determines whether the video test signal detector 144 of the second VTR 140 has detected the video test signal.
The D2B protocol is used to inquire the second VTR 140 via the D2B control line 121, the frequency division multiplexing circuit 119, the AV input / output terminal T1 and the AV signal line 131 (step S15). The second VTR 140 has a signal detector 14
4 detects a video test signal (YES in step S16) (in this case, unlike the connection state shown in FIG. 6, the second VTR 140 is connected to the terminal T1 via the AV signal line 131. In the D2B protocol, signal detection is reported to the D2B communication processing microcomputer 109 via the AV signal line 131, the AV input / output terminal T1, the frequency division multiplexing discrimination circuit 119, the D2B control line 121, and the D2B communication processing IC 110. . This allows D2
In the B communication processing microcomputer 109, the AV center, that is, the AV input / output terminal T1 of the television receiver 100 is the second V
It is determined that the device is connected to the TR140, the second VTR is displayed in the T1 device column of the OSD of the CRT 113, and
The name of the second VTR140, in the D2B protocol,
D2B control line 121, frequency division multiplexing circuit 119, A
The second via the V input / output terminal T1 and the AV signal line 131
Inquires the VTR 130 and displays the result on the screen display IC
It is displayed in the OSD name field of the CRT 113 via 114 (step S17).

If there is no signal detection response from the second VTR 140 (NO in step S16), the D2B communication processing microcomputer 9 displays an abnormality in the T1 column of the OSD of the CRT 113 (in this example, the VTR is the maximum). This is an example in which up to two VTRs can be connected.When three or more VTRs can be connected, whether or not a video test signal is detected for the third, fourth, ... VTRs is determined by the D2B protocol. An inquiry is made via the D2B control line 121, the frequency division multiplexing circuit 119, the AV input / output terminal T1 and the AV signal line 131).

When the processing of step S14, S17 or S18 is completed, the D2B communication processing microcomputer 109 controls the switch 118 to stop the output of the video test signal of the signal generator 22 (step 19). .

Next, the D2B communication processing microcomputer 109 of the AV center 100 puts the AV input / output terminal T1 in the video signal detection mode and sets the D2B protocol to the first VTR 130 by the D2B control line 121 and the frequency division multiplexing circuit 119. , AV input / output terminal T1 and AV signal line 131
Via (addressing the first VTR 130),
An instruction to generate a video test signal is sent from the signal generator 132 (step S21), and it is checked whether the signal detector 124 receives the video test signal via the terminal T1 (step S22). If yes, the OSD of the CRT 113 is detected. Bidirectional OK is displayed in the T1 column. If the signal detector 124 has not received the video test signal, an abnormality is displayed in the T1 column of the OSD of the CRT 113 (step S24).

Next, the D2B communication processing microcomputer 109 of the AV center 100 releases the video signal detection mode of the AV input / output terminal T1 (step S25), puts the AV input / output terminal T2 in the video signal detection mode, and sends it to the second VTR 140. Then, according to the D2B protocol, a video test signal is output from the signal generator 142 through the D2B control line 121, the frequency division multiplexing circuit 119, the AV input / output terminal T2 and the AV signal line 141 (addressing the second VTR 140). A command to generate is sent (step S26), and it is checked whether the signal detector 124 has received the video test signal through the terminal T2 (step S27).
Bidirectional OK is displayed in the T2 column of the 13 OSD. If the signal detector 124 is not receiving the video test signal,
The abnormality is displayed in the T2 column of the OSD of the CRT 113 (step S29).

Next, the D2B communication processing microcomputer 109 of the AV center 100 releases the video signal detection mode of the terminal T2 (step S30), puts the terminal T3 into the video signal detection mode, and sends the LDP 150 to the D2B protocol by the D2B protocol. Control line 121, frequency division multiplexing circuit 11
9, via the AV input / output terminal T3 and the AV signal line 141 (addressing the LDP 150), the signal generator 1
A command for generating a video test signal is sent from 52 (step S31), and it is checked whether the signal detector 124 receives the video test signal via the terminal T2 (step S3).
2), if received, D2B communication processing microcomputer 109
Determines that the AV center, that is, the terminal T3 of the television receiver 100 is connected to the LDP 150, and C
The LDP is displayed in the device column of the AV input / output terminal T3 of the OSD of the RT113, and the name of the LDP150 is changed to D2B.
According to the protocol, the D2B control line 121, the frequency division multiplexing circuit 119, the AV input / output terminal T3 and the AV signal line 15 are used.
1 to the LDP 150, and the result is C
It is displayed in the T3 name field of the OSD of the RT 113 (step S33). If the signal detector 124 has not received the video test signal, the abnormality is displayed in the T3 column of the OSD of the CRT 113 (step S34). When the processing of step S33 or S34 ends, the D2B communication processing microcomputer 10
9 releases the video signal detection mode of the terminal T3 (step S35).

After the D2B communication processing microcomputer 109 of the AV center 100 grasps the connection setting status of the AV center 100 as described above, the connection information indicating this status is sent to the D2B control line 121 and the frequency division by the D2B protocol. Multiplexing circuit 119, AV input / output terminals T1, T2 and T3, and AV signal lines 131, 141 and 151.
To the first and second VTRs 130 and 140 and the LDP 150 (steps S36, S
37, S38), VTRs 130 and 140 and L
The DP 150 does not need to grasp the connection setting status again.

According to the embodiment shown in FIG. 6 and the processing shown in FIGS. 7 to 9, the AV center 100 has the VTR 130.
And 140 and the connection state with LDP 150 can be easily grasped, and the connection setting of VTRs 130 and 140 and LDP 150 can be easily initialized.

In the embodiment of FIG. 6, the video signal is used as the test signal for grasping the connection status, but an audio signal may be used.

Although the number of AV input / output terminals of the AV center 100 is three in the above embodiment, the number can be increased or decreased as necessary. Also, VTR and LD
The same applies to the number of P. Further, a CDP (compact disc player) may be connected.

Next, an embodiment of the video equipment control method of the present invention will be described. In this embodiment, the control signal for the video equipment is sent by being superimposed on the video signal during a predetermined horizontal scanning period in the vertical synchronization section of the video signal sent to the video equipment. That is, in the example of FIG. 1, for example, the controller 31 sends the AV bus control signal in the last one horizontal period of the vertical synchronization section of the video signal sent to the VTR 32. 6M
With a clock signal of Hz, about 40 characters can be transmitted during one horizontal scanning period, so that if one horizontal scanning period is used for each vertical synchronization period, about 40 characters can be transmitted. That is, NTS
In the case of the C method, 40 bytes can be transmitted in each vertical scanning period, that is, about every 17 Ms, which is sufficient as a practical speed. For example, as the error recovery process, the last 3 bytes of 40 bytes in one horizontal scanning period may be used as the FCC check code.

As described above, if the control signal for the video equipment is sent during a predetermined horizontal scanning period in the vertical synchronizing section of the video signal sent to the video equipment, the video signal can be connected to the video equipment. Since the line for control and the line for control signal can be made common, the wiring is simplified and erroneous connection can be prevented. Further, since the one-to-one communication can be performed, it is not necessary to add the address information to the control signal, and the use efficiency of the line for transmitting the video signal and the control signal can be improved.

Further, during the vertical synchronization period of the video signal, the AV
By inserting the bus control signal, it is possible to realize an automatic repeat function in the case of an in-store display and to create AV software including a procedure for education and learning.

When an FCC error is detected,
It is preferable to send a NAK (Not Acknowledge) signal using the video signal line in the reverse direction to request retransmission of the video signal.

[0053]

According to the video equipment control device of the first or second aspect, the control signal is supplied to each video equipment via the signal line as a signal in the RF band or the base band of the video signal. Therefore, the control line is not required, and the wiring process is simplified.

According to the video equipment control device of the third aspect, since the control signal for the video equipment and the video signal to be sent to the video equipment are frequency-multiplexed, the video signal line and the control signal line are common. Since it can be done, the wiring is simple and erroneous connection can be prevented.

According to the video equipment control method of the fourth aspect, since the control signal for the video equipment is sent during a predetermined horizontal scanning period in the vertical synchronization section of the video signal sent to the video equipment, it is possible to communicate with the video equipment. In connection between them, the line for the video signal and the line for the control signal can be made common, so that the wiring can be simplified and erroneous connection can be prevented. Further, it is not necessary to add the address information to the control signal, so that the use efficiency of the line for transmitting the video signal and the control signal can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a video system to which a video equipment control device of the present invention is applied.

2 is a block diagram showing a configuration example of a circuit incorporated in a controller 31 of FIG. 1. FIG.

3 is a block diagram showing a configuration example of a circuit incorporated in the LDP 33 of FIG.

4 is a spectrum diagram illustrating a modulation method of a modulation circuit 43 in FIG.

5 is a spectrum diagram illustrating another modulation method of the modulation circuit 43 of FIG.

FIG. 6 is a block diagram showing the configuration of an embodiment when the present invention is applied to an AV system.

FIG. 7 is a flowchart showing a first part of an example of a connection setting initialization operation in the embodiment of FIG. 1;

FIG. 8 is a flowchart showing a second part of an example of the connection setting initialization operation of the embodiment of FIG. 1;

9 is a flowchart showing a third part of an example of the connection setting initialization operation of the embodiment of FIG. 1. FIG.

FIG. 10 is a block diagram showing a configuration of an example of a conventional video system.

[Explanation of symbols]

11, 12, 13 Signal line 14 Control line 31 Controller 32 VTR 33 LDP 41 CPU 43 Modulation circuit 51 Separation circuit 52 Demodulation circuit 53 Reading circuit 54 CPU 100 AV center 104 CPU 105 ROM 106 RAM 107 Nonvolatile memory 109 D2B communication processing microcomputer 113 CRT 118 switcher 119 frequency division multiplexing circuit 120 internal bus 121 D2B control line 122, 132, 142, 152 video test signal generator 124, 134, 144, 154 video test signal detector 130 first VTR 140 second VTR 150 LDP T1, T2, T3, T4 AV input / output terminals

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location H04N 5/85 Z 7916-5C H04Q 9/00 301 E 7170-5K

Claims (4)

[Claims] 1. A first video device that outputs a video signal, a second video device that outputs a video signal, and a controller that is connected to the first and second video devices via signal lines, respectively. And the controller modulates a control signal for controlling the first or second video device into a signal in an RF band of the video signal, and then outputs the first or second video through the signal line. A video device control device characterized by outputting to a device. 2. A first video device that outputs a video signal, a second video device that outputs a video signal, and a controller that is connected to the first and second video devices via signal lines, respectively. And the controller modulates a control signal for controlling the first or second video device into a signal in a baseband band of the video signal, and the first or second signal via the signal line.
The video equipment control device is characterized by outputting to the video equipment. 3. A video equipment control device comprising: a multiplexing means for frequency-multiplexing a control signal for the video equipment and a video signal to be sent to the video equipment. 4. A video device control method, comprising: sending a control signal to the video device during a predetermined horizontal scanning period in a vertical synchronization section of the video signal sent to the video device.