JPH04168684A - Control system for av equipment - Google Patents

Abstract

PURPOSE:To control both of first and second AV equipment by correlating both AV equipment with each other through the first equipment by transmitting a control signal generated by the first equipment to the second equipment together with an AV signal and controlling the operations of the second equipment in accordance with the controlling content of the control signal. CONSTITUTION:When the power supply to a video deck A is turned on, a mixing switch 6 automatically turns on and video signals outputted from a video circuit 2 and a control signal outputted from a control signal generation circuit 4 are superimposed upon another by means of a mixing circuit 8. The mixed signal is transmitted to a color TV receiver B through a video output terminal 10 and video output terminal 12 and the control signal is separated from the mixed signal by means of a band-pass filter 18. A microcomputer 28 for control automatically turns on the power supply to the TV receiver B and, at the same time, switches the TV/video change-over switch to a video mode side when a signal indicating the presence of the control signal is inputted. Therefore, both of the AV equipment A and B can be controlled by correlating both equipment A and B with each other by operating and discriminating the status of one AV equipment A only.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a video tape recorder (VTR).

In component systems of various AV equipment (audio/visual equipment) such as color television receivers (CTV), digital audio recorders (DAT), laser disc players (LDP), and digital recording VTRs, at least two AV The present invention relates to a system for transmitting some kind of control signal between devices.

<Prior Art> As a conventional example, a combination of a video deck and a color television will be described.

The initial operation when viewing images played back on a video deck on a color TV is to turn on the power to the video deck and color TV separately, and then set the TV/video mode switch on the color TV to video mode. I had to.

Even when performing these operations using a remote control device, it was necessary to perform separate operations on the video deck and color television.

<Till that the invention seeks to solve> As described above, in the conventional component system of AV equipment, most operations, including the basic operation of turning on the power, are performed independently on each AV equipment. It was extremely inconvenient.

The present invention has been devised in view of the above circumstances, and when the component systems of at least two AV devices are used simultaneously to perform some operation, the operation and status of one of the AV devices is The purpose is to make it possible to control both AV devices by associating them with each other only by making decisions.

<Means for Solving the Problems> In order to achieve the above object, the present invention has the following configuration.

That is, the AV @ device control system of the present invention is a system for transmitting an AV signal generated by a first AV device to a second AV device. The second AV device is equipped with means for generating a control signal indicating the situation, and means for superimposing the control signal on the AV signal.
means for separating the control signal from the superimposed signal received from the V device; means for determining the control content of the separated control signal; and means for controlling the operation of the second AV device in accordance with the control content. It is characterized by being equipped with.

Effect〉 The effects of the above configuration of the present invention are as follows.

The control signal generated by the first AV device is transmitted together with the AV signal to the second AVller, and the second AV device controls the operation of the second AV device according to the control content of the control signal. .

That is, the second AV device can be controlled from the first AV device side.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing the main parts of a component system of a video deck and a color television according to an embodiment of the present invention.

In FIG. 1, A is a video deck (VTR) and B is a color television (CTV).

The video deck A has a video circuit 2, a control signal generation circuit 4, a mixing switch 6, a mixing circuit 8, a video output terminal IO, and the like.

When the video deck A is powered on by manual operation or remote control operation, the mixing switch 6 is automatically turned on, and the video signal output from the video circuit 2 and the control signal output from the control signal generation circuit 4 are mixed. superimposed in circuit 8,
The video is sent out from the video output terminal 10 to the color television B.

In order to prevent the control signal generated by the control signal generation circuit 4 from affecting the video signal on which it is superimposed, the frequency of the control signal is changed from the frequency band of the video signal as shown in FIG. far enough away 1
Set to 5MHz.

Note that in FIG. 2, the Y signal is a luminance signal in the video signal, and the C signal is a chroma signal (color signal) in the video signal.

Color TV B includes a video input terminal 12, a 4.25 MHz low-pass filter 14 for separating luminance signals, and a 3.58 MHz band-pass filter 1 for separating chroma signals.
6, a 15 MHz bandpass filter 18 for control signal separation, a luminance signal processing circuit 20, a chroma signal processing circuit 22, a rectifier circuit 24, and a comparator 26.
, l5lJli ficon 28, and prohibition switch 30
etc.

A superimposed signal of a video signal and a control signal sent from the video output terminal 10 of the video deck A is transmitted to the color television B via the video input terminal 12, and the luminance signal (Y signal) in the video signal is passed through the low-pass filter 14. The chroma signal (C signal) in the video signal is separated by the band pass filter 16 and sent to the chroma signal processing circuit 22, and the control signal is sent to the 15 MHz band pass filter 18.
is separated and sent to the rectifier circuit 24.

The separated control signal is rectified in the rectifier circuit 24 and converted to a DC level, and then sent to the comparator 2.
At step 6, the signal is compared with a reference value, and when it is larger than the reference value, the output of the comparator 26 becomes "H" level and sends a signal to the control microcomputer 28 indicating that the control signal has been received.

When the control microcomputer 28 receives a signal containing a control signal, it automatically turns on the power of the color TV B and switches the TV/video mode changeover switch to the video mode.

Contrary to the above, when you turn off the power to video deck A, the control signal disappears, so the control microcomputer 2
8 will receive a signal without a control signal, which will automatically turn off color TV B.
F.

As described above, only by turning on the power on the video deck A side, it is possible to automatically turn on the power on the color television B side and switch to the video mode.

Note that when it is desired to prohibit such automatic control, the prohibition switch 30 may be turned on.

For example, when setting timer recording, there is no need to turn on color TV B, so the prohibition switch 30
Turn ON, and turn ON only the video deck A side.

Although the above embodiment concerns power ON10FF and video mode switching in a combination of video deck A and color television B, the present invention is not limited to this, and has been developed as follows. Examples are also possible.

When the noise component contained in the playback video signal of vTR (video deck) is large, the image on the television screen
A control signal for softening t (contour strength lI) is sent.

That is, the level of the luminance FM signal picked up from the tape head of the VTR is determined, a control signal having an intensity component corresponding to the determined level is generated, superimposed on the video signal, and sent to the television. Note that the frequency of the control signal at this time does not affect the video signal;
In addition, the power source is 0N10FF, and the frequency is a specific frequency that is different from the frequency 15MH2 of the control signal for switching the video mode.

When the control microcomputer on the television side receives this control signal, it controls the image quality on the software side according to the level.

In addition to automatic control of image quality, it is possible to control various screen states, such as screen brightness and color density, depending on the status of the video signal being played back by the VTR.

Furthermore, the present invention is not limited to the combination of a VTR and a television.

For example, it is possible to develop a system that controls the operation of AV equipment connected to a VTR via a video/audio table depending on the situation on the VTR.

More broadly, when one AV device is combined with another AV device, the operation of the other AV device is automatically performed in response to an operation on one AV device, or automatically depending on the situation in one AV device. It is also possible to configure it to control the operation.

<Effects of the Invention> According to the present invention, a control signal generated in a first AV device is transmitted to a second AV device together with an AV signal,
Since the second AVII device controls the operation of the second AV equipment according to the control content of the control signal, the control/operation of the first AV equipment and the second There is no need to separately control and operate the second AV device, and the second AV device can be controlled directly through the first AV device, and both AV devices can be controlled in relation to each other. This has the effect of significantly improving the operability and controllability of AV equipment.

Moreover, the AV signal and the control signal are superimposed and the first
Since the control signal is sent from one AV device to a second AV device, and the second AV device separates the control signal from the superimposed signal, the above effects can be achieved without increasing the number of connection lines between both AV devices. can do.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the main parts of a component system of a video deck and a color television according to an embodiment of the present invention, and FIG. 2 is a diagram showing the frequency distribution of superimposed signals.

Claims (1)

[Scope of Claims] [1] A system for transmitting an AV signal generated by a first AV device (A) to a second AV device (B), means (4) for generating a control signal indicating the status of the AV equipment (A) in No. 1;
) and means (8) for superimposing the control signal on the AV signal, and the second AV device (B) receives the control signal from the superimposed signal received from the first AV device (A). Separating means (18) and means (26) for determining the control content of the separated control signal.
and a means (28) for controlling the operation of the second AV equipment (B) according to the content of the control.