JPH05191791A - Video signal transmitter - Google Patents

Abstract

PURPOSE:To simplify the connection between devices, to reduce mis-connection and to obtain a desired video system by superimposing a category signal representing an output. device onto a video signal and applying selection processing to the video signal based on the category signal. CONSTITUTION:Video signals AV1A,AV1B of VTRs 4A,4B of a video system are inputted to a selector 2 and video signals AV1C,AV1D of a video disk player 4C and a television tuner 4D are inputted to the selector 2. A VTR section 6 of a recorder 4A reproduces the signal V1A and a superimposing circuit 8 superimposes a prescribed category signal and outputs the result. Similarly, a category signal is superimposed onto the signals AV1B,AV1C,AV1D. A selection circuit 10 of the selector 2 outputs the video signal selected by the user. In this case, a category signal discrimination circuit 12 of the selector 2 detects category signals IDA-IDD to discriminate output devices 4A-4D.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal transmission apparatus applicable when connecting video equipment such as a monitor and a video tape recorder.

[0002]

2. Description of the Related Art Conventionally, in a video signal input device such as a monitor device, input signals of a plurality of systems can be selectively input. This allows the user to create a desired video system by connecting, for example, predetermined terminals of the video tape recorder and the monitor device.

[0003]

However, in the case of forming a video system in this way, it is necessary to connect between predetermined terminals set in advance for each video device, and the connection is complicated. was there. Further, when the system configuration is increased in size, there is a drawback that an erroneous connection is likely to occur along with this, and when the erroneous connection is made, it is difficult to find out.

As one method of solving this problem, a means of separately transmitting a cone troll signal between the devices and discriminating the video device based on the control signal can be considered. However, this method has a troublesome problem that it is necessary to transmit the control signal in addition to the audio signal and the video signal. The present invention has been made in view of the above problems, and an object of the present invention is to provide a video signal transmission device that can be easily connected to form a desired video system.

[0005]

According to the present invention, there is provided a video signal transmission device for transmitting a video signal from a video signal output device to a video signal input device. The sync signal portion has an identification signal superimposing circuit that superimposes an identification signal representing the type of the video signal output device, and the video signal input device has an identification signal detecting circuit that detects the identification signal. This is achieved by a video signal transmission device that selectively processes the video signal.

[0006]

According to the above construction, the identification signal indicating the type of the video signal output device is superposed on the synchronizing signal portion of the video signal, and the identification signal is detected by the video signal input device. The video signal output device can be determined based on the.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the examples described below are suitable specific examples of the present invention, and therefore, various technically preferable limitations are attached thereto, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these modes.

In FIG. 1, reference numeral 1 denotes a video system as a whole, which outputs a desired video signal to a monitor device 3 via a selector 2.

That is, the video system 1 inputs the video signals AV1A and AV1B of the first and second video tape recorders (VTR) 4A and 4B to the selector 2, and at the same time the video disc player 4C and the television tuner 4D. The video signals AV1C and AV1D are input to the selector 2. Video tape recorder 4A is V
The TR section 6 reproduces the video signal AV1A, and the category signal superimposing circuit 8 superimposes a predetermined category signal and outputs it.

Here, the category signal IDA is an identification signal representing the output device of the video signal AV1A, and the category code assigned to the output device of the video signal AV1A, and the identification that this device is a video tape recorder. Code, device number assigned to this device, identification code indicating the type of video signal AV1A (decoded video signal,
(Representing the types of component video signals, color signals, etc.) and the like.

Further, the category signal IDA is superimposed on the video signal AV1A by utilizing the vertical blanking period of the video signal AV1A so as not to affect the display screen. This detects this category signal,
It can be identified that the output device of the video signal AV1A is the video tape recorder 4A. Therefore, the category signal superimposing circuit 8 reads the category code or the like from the memory circuit at a predetermined timing with reference to the video signal AV1A, and thereby generates the category signal IDA.

On the other hand, the video tape recorder 4B
Is configured similarly to the video tape recorder 4A. This makes it possible to detect the category signal IDB and determine the output device of the video signal AV1B.

The video disc player 4C reproduces the video disc to output a video signal AV1C, and at this time, superimposes the category signal IDC on the video signal AV1C and outputs it. Here, the video disk player 4C
For example, the category signal IDC is formed by a category code indicating that this device is a reproduction-only device, an identification code indicating that this device is a video disk player, and the like. Thus, in the video signal AV1C, the category signal IDC can be detected to identify that the output device is the video disk player 4C.

The television channel 4D receives a channel selected by the user and outputs a video signal AV1D and an audio signal. At this time, the television player 4D superimposes the category signal IDD in the same manner as the video disc player 4C, and thereby the video signal A
It is possible to identify that the output device of V1D is a television tuner 4D. The selector 2 receives the video signals AV1A to AV4A in the selection circuit 10 and outputs the video signal selected by the user. At this time, the selector 2 informs the category signal discrimination circuit 12 of the video signal AV1A.
To AV4A, where category signals IDA to IDD
To detect. That is, the category signal discrimination circuit 12
Horizontal and vertical sync signals are detected from each of the video signals AV1A to AV4A, and a reference signal synchronized with each video signal is generated based on the horizontal and vertical sync signals. Further, the category signal discriminating circuit 12 detects the vertical blanking period with reference to this reference signal, and thereby detects the category signal of each video signal.

Thus, the category signal discrimination circuit 12 detects the category signal from each video signal and discriminates the output device of each video signal by superimposing the category signal by utilizing the vertical blanking period of the video signal. can do. Based on this determination result, the category signal determination circuit 12 selects the video signal AV1A of the video tape recorder 4A and outputs it to the monitor device 3 when the user selects the video tape recorder 4A, for example. As a result, the user can easily configure the video system by simply connecting the video signal output from one video device to the desired terminal of the selector 2, and the connection work can be simplified and the incorrect connection can be made. Can be reduced. Therefore, the user can easily connect the devices to form a desired video system.

Further, in this embodiment, the selector 2
Is the category signal superimposing circuit 1 for the selection output of the selecting circuit 10.
4, and the category signal assigned to the selector 2 is superimposed and output. Thereby, when outputting the video signal from the selector 2 to the video tape recorders 4A and 4B, and even when the video system is further expanded, connection work is simplified and erroneous connection is reduced.

This embodiment is constructed as described above,
By superimposing a category signal representing the output device of this video signal in the vertical blanking period of the video signal and selectively inputting the video signal based on this category signal, connection work between devices can be simplified, False connections can be reduced. Therefore, it is possible to form the desired video system by simply connecting the devices accordingly. In the above embodiment, the case where the present invention is applied to the selector has been described, but the present invention is not limited to this, and for example, video signal transmission for connecting various video signal output devices and video signal input devices such as surround switching. It can be widely applied to devices.

[0018]

As described above, according to the present invention,
By superimposing a category signal representing an output device on a video signal and performing a selection process on the video signal based on this category signal, connection work between devices can be simplified and erroneous connection can be reduced. A video signal transmission device capable of forming a desired video system by simply connecting the two can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a video system according to an embodiment of the present invention.

[Explanation of symbols]

 1 Video System 2 Selector 4A, 4B Video Tape Recorder 4C Video Disc Player 4D Television Connection 8/14 Category Signal Superimposing Circuit 10 Selection Circuit 12 Category Signal Discriminating Circuit

Claims (1)

[Claims] 1. A video signal transmission device for transmitting a video signal from a video signal output device to a video signal input device, wherein the video signal output device includes a type of the video signal output device in a sync signal portion of the video signal. An identification signal superimposing circuit that superimposes an identification signal that represents, the video signal input device includes an identification signal detecting circuit that detects the identification signal, and selectively processes the video signal based on the identification signal. Characteristic video signal transmission device.