JPH089251A - Video switching device - Google Patents

Abstract

PURPOSE:To recover the failure of the video output caused by the misoperation of an operator when the special effect, etc., are processed for the broadcast video materials. CONSTITUTION:An input video signal Vi is divided into two systems Vi1 and Vi2, and the delay output produced by a delay circuit 2 of the system Vi2 is switched to the system Vi1 by a switching circuit 3 and inputted to a video effect device 4. Then a system Vo1 and another system Vo2 are inputted to a switching circuit 8 via a delay circuit 7 and directly respectively among those outputs of the device 4. Thus these systems Vo1 and Vo2 are selected by the circuit 8. If an operator has a misoperation while outputting the systems Vi1-Vo1, the systems Vi2-Vo2 are immediately selected by both circuits 3 and 8. Under such conditions, the selected system is delayed compared with its unswitched state by a delay time of the circuit 2. Thus the second operation is possible and therefore a normal operation can be carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video switching device, and more particularly to a video switching device for performing video processing such as video material switching and special effects during program production at a broadcasting station.

[0002]

2. Description of the Related Art Conventionally, news and sports programs have been produced in television broadcasting stations by using live broadcasts and recordings, and image processing such as special effects of these produced image materials by an image sub-adjustment device. When the operation is performed, the operator depresses the operation button on the operation console.

FIG. 2 shows a schematic configuration of the apparatus in this case. An input video signal Vi is input to a video effect apparatus 4 via a video distributor 1 and undergoes video processing such as special effects by this apparatus 4. It is derived as the output video Vo. In the figure, it is general that there are a plurality of input video signals Vi and output video signals of the video distributor 1. Therefore, in order to indicate that there are a plurality of video signals, a diagonal line is drawn to the left.

[0004]

In the video effect device 4,
Since an operator manually presses a button on the console to perform image processing, an erroneous operation such as a button operation error or a switching timing error occurs. In this case, there is a problem that a wrong video is output as it is and broadcast.

An object of the present invention is to provide a video switching device capable of deriving a normal video output by allowing the operation of switching the input system to be performed again even if an erroneous operation by an operator occurs in live broadcasting or recording. That is.

[0006]

A video switching device according to the present invention comprises a distribution means for distributing an input video signal into first and second video signals, and a first delay means for delaying the first video signal. A first switching means for selectively deriving the delayed output and the second video signal, a video processing means for performing video processing on the output of the first switching means, and the video processing Second delay means for delaying the output of the means;
Second switching means for selectively deriving the delayed output of the delay means and the output of the video processing means, and the second switching means when the first switching means selects the second video signal. Switching means selects the delay output of the second delay means, and the first switching means selects the delay output of the first delay means, the second switching means causes the video processing means to operate. Control means for switching to select the output of.

[0007]

The video signal is divided into two systems, only one system is delayed, and both systems are selectively derived by the switch. This derived output is input to a video effect device such as special effect processing,
This output is also divided into two systems, only one system is delayed, and these two systems are selectively derived by another switch. By controlling the switching of these two switching devices so that both systems have the same delay amount at the output end, even if the switching of one system is incorrect, switching to another system will result in normal video output. Is selected and derived.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. In the input circuit 10, the input video signal Vi is distributed by the video distributor 1 into two systems of video signals Vi1 and Vi2,
One of the input video signals Vi is directly input to the switching circuit 3,
The other video signal Vi2 is input to the switching circuit 3 via the delay circuit 2. It is assumed that the delay time of the delay circuit 2 is set to n seconds. Video signals of both systems are selectively derived by the switching circuit 3 and input to the video effect device 4.

After the special effects and the like are processed in the video effect device 4, they are supplied to the output circuit 20. In the output circuit 20, the video output Vo1 of one system is input to the switching circuit 8 via the delay circuit 7, and the video output Vo2 of the other system is directly input to the switching circuit 8. It is assumed that the delay time of the delay circuit 7 is set to n seconds, which is equal to that of the delay circuit 2. Then, the switching circuit 8 selectively derives the output video signal Vo.

The switching control of these switching circuits 3 and 8 is performed in synchronization with a control signal from the switching control circuit 6, but the switching control is performed in response to the pressing control of the operation button 5 provided in the video effect device 4. It is supposed to be done.

When the input video signal Vi1 is selected by the switching circuit 3 and input to the video effect device 4, the switching control circuit 6
Accordingly, in the output circuit 20, the output video signal Vo1 delayed by the delay circuit 7 for n seconds is selected by the switching circuit 8, and the output signal V1 is output.
It is derived as o. This system is the first
I will call it a system.

When the input video signal Vi2 delayed by the switching circuit 3 is selected and input to the video effect device 4,
The switching control circuit 6 selects the output video signal Vo2 which is not delayed by the output circuit 20 by the switching circuit 8 and outputs the output signal V2.
It is derived as o. This line is second
I will call it a system.

Here, if an erroneous operation is made by the operator during the operation by the first system,
By depressing the switching button 5, the first system is switched to the second system, whereby the input signal to the video effect device 4 is returned to the one n seconds before, so that the operator can perform the correct operation again. It will be possible.

Further, since the switching control circuit 6 controls the switching so that the video delay amount at the output end becomes constant, the phase of the output video signal of both systems does not change.

Although it is necessary to perform the return from the second system to the first system, this return processing can be performed by pressing the operation button 5 during the commercial program. As a result, the standby state (standby) for an emergency is again established, and the erroneous operation that may occur next can be dealt with.

Also in the present embodiment, it is general that there are a plurality of video signal systems in the input circuit 1. Therefore, as in the case of FIG. It indicates that.

[0018]

As described above, according to the present invention, the delay time difference when the system is switched from the signal without delay of the input circuit to the signal with delay even if an operation error by the operator occurs is utilized. The operation performed once can be redone by switching the system, and the normal video output can be achieved.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a conventional video switching method.

[Explanation of symbols]

 1 video signal distributor 2, 7 video delay circuit 3, 8 switching circuit 4 video effect device 5 switching button 6 switching control circuit 10 input circuit 20 output circuit

Claims (3)

[Claims] 1. A distribution means for distributing an input video signal into first and second video signals, a first delay means for delaying the first video signal, the delayed output and the second video signal. And a video processing means for performing video processing on the output of the first switching means.
Second delay means for delaying the output of the video processing means,
A second switching means for selectively deriving the delayed output of the second delay means and an output of the video processing means; and the first switching means selecting the second video signal. When the second switching means selects the delay output of the second delay means and the first switching means selects the delay output of the first delay means, the second switching means An image switching device comprising: a control unit for switching the output of the image processing unit to select the output. 2. An external command is provided when the first switching means is controlled to select the second video signal and the second switching means is controlled to select the delayed output of the second delay means. In response to the control, the first switching means controls the delayed output of the first delay means, and the second switching means controls the output of the video processing means. The video switching device according to item 1. 3. The video switching device according to claim 1, wherein the delay times of the first and second delay means are set to be the same.