JP3230687B2 - D2 standard video adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a D2 standard video adjuster, and more particularly to a video signal input circuit of a D2 standard digital video adjuster.

[0002]

2. Description of the Related Art A conventional D2 standard video adjuster (D2 digital switcher) has a D2 sync separation circuit for extracting a synchronizing signal from a video signal compliant with the D2 standard. A phase control signal for controlling the phase of the input video signal is output by a phase comparison circuit that compares the phases, and the phase control signal is input to a variable delay circuit that delays a digital material video signal, and is used as a reference for a D2 standard video adjustment device. Delayed to match phase.

[0003]

However, in the above-described conventional D2 standard video adjusting device, when a video signal not conforming to the D2 standard, such as a video signal converted from analog to digital, is input, a synchronizing signal portion is input. Data is D
Therefore, there is a problem that the synchronization signal cannot be detected and the phase cannot be adjusted because the signal does not conform to the two standards.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and provides a D2 standard video adjustment apparatus capable of adjusting the phase of a digital material video signal having a synchronization signal that does not conform to the D2 standard. With the goal.

[0005]

According to the present invention, there is provided a D2 standard video adjusting apparatus, comprising: a digital video signal terminal to which a digital material video signal is input in accordance with the D2 standard;
Connected to the image signal terminal and input to the digital video signal terminal
The digital material video signal is a D2 standard signal.
Synchronize signal of D2 standard and synchronization detection
And D2 synchronous separation circuit for outputting a signal, said digital video
A digital sync separator which is connected to the signal terminal taking out a synchronizing signal from the digital material video signal, the D2 synchronization
A synchronization signal output and the output of the digital sync separator and synchronizing signal switching device for switching the pre <br/> SL D2 sync separator in accordance with the presence or absence of the synchronization detection signal input from the separation circuit, the synchronizing signal switching unit And a reference synchronization signal, and a phase comparison circuit that outputs a digital material video signal delay amount control signal based on the phase difference between them, and a digital material video signal and the digital material video signal delay amount control signal. And a video signal delay circuit for adjusting a phase of the digital material video signal so as to match a reference phase.

[0006]

According to the D2 standard video adjusting apparatus of the present invention,
When a digital material video signal conforming to the two standards is input, a synchronization signal of the digital material video signal is extracted by a D2 sync separation circuit. When a digital material video signal that does not conform to the D2 standard is input, a synchronization signal of the digital material video signal is extracted by a digital sync separation circuit. The phase of the above synchronizing signal is adjusted so as to match the reference phase signal of the D2 standard image adjustment device, and the phase of the digital material image signal is adjusted so as to match the reference phase.

[0007]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an embodiment of a D2 standard video adjusting apparatus according to the present invention. Video signal input terminal 1
Is an input terminal conforming to the D2 standard, and receives a digital material video signal. The digital material video signal is
Includes synchronization signal. The reference synchronization signal input terminal 2
This is a terminal for inputting a reference synchronization signal of the 2 standard video adjustment device. The D2 synchronization separation circuit 3 is a circuit for extracting a D2 standard synchronization signal in a digital material video signal conforming to the D2 standard.
Outputs synchronization detection signal. The digital sync separation circuit 4
D2 such as a video signal converted from analog to digital
This is a circuit for extracting a synchronization signal from a video signal that does not conform to the standard. When the synchronization detection signal is input from the D2 synchronization separation circuit 3, the synchronization signal switch 5 inputs the output of the D2 synchronization separation circuit 3 to the phase comparison circuit 6, and receives the synchronization detection signal from the D2 synchronization separation circuit 3. If not, the output of the digital sync separation circuit 4 is input to the phase comparison circuit 6.
The phase comparison circuit 6 calculates a digital material video signal delay amount based on the phase difference between the synchronization signal of the digital material video signal input from the synchronization signal switch 5 and the reference synchronization signal input from the reference synchronization signal input terminal 2. Outputs control signal. The video signal delay circuit 7 receives the digital material video signal and the digital material video signal delay amount control signal, and adjusts the phase of the digital material video signal to match the reference phase. The video signal output terminal 8 is a terminal that outputs an output signal of the video signal delay circuit 7 to another device.

Next, the operation of the D2 standard image adjusting apparatus thus configured will be described. Video signal input terminal 1
Are supplied to a D2 sync separation circuit 3 and a digital sync separation circuit 4. here,
When the synchronization signal of the digital material video signal conforms to the D2 standard, both the D2 synchronization separation circuit 3 and the digital synchronization separation circuit 4 perform the synchronization signal separation operation, and at the same time, the D2 synchronization separation circuit 3 Output a signal. If the synchronization signal of the digital material video signal does not conform to the D2 standard, both the D2 synchronization separation circuit 3 and the digital synchronization separation circuit 4 perform the synchronization signal separation operation. Does not output a signal. Therefore,
When a digital material video signal conforming to the D2 standard is input to the synchronization signal switch 5, the synchronization signal of the digital material video signal is extracted from the D2 sync separation circuit 3, and a digital material video signal not conforming to the D2 standard is input. In this case, the synchronization signal of the digital material video signal is extracted from the digital synchronization separation circuit 4.

The extracted synchronizing signal is supplied to a phase comparator 6
Sent to The phase comparison circuit 6 compares the phase of the synchronization signal with the reference synchronization signal, generates a digital material video signal delay amount control signal based on the magnitude of the phase difference, and outputs it to the video signal delay circuit 7. In the video signal delay circuit 7 inputs the digital source video signal and a digital video content signal delay amount control signal, the digital source video signal and adjusting the phase to match the reference phase, the video image signal whose phase is adjusted Output to the signal output terminal 8.

As described above, the digital material video signal input from the video signal input terminal 1 can be phase-synchronized with a digital material video signal of the D2 standard or a digital material video signal having a synchronization signal that does not conform to the D2 standard. Can be adjusted.

[0012]

As described above, according to the D2 standard video adjusting apparatus of the present invention, the input digital material video signal
Even if the synchronization signal is out of specification, the digital material video signal can be adjusted to the same phase as the reference synchronization signal. Therefore, the D2 standard video adjustment device of the present invention can mix and combine other material video signals with another video adjustment device using another video adjustment device even if the input digital material video signal has a synchronization signal that deviates from the D2 standard. A digital material video signal that can be output can be output.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a D2 standard video adjustment device according to an embodiment of the present invention.

[Explanation of symbols]

 1: video signal input terminal 2: reference synchronization signal input terminal 3: D2 synchronization separation circuit 4: digital synchronization separation circuit 5; synchronization signal switch 6; phase comparison circuit 7; video signal delay circuit 8; video signal output terminal

Claims (1)

(57) [Claims] 1. A digital video signal terminal digital source video signal conforming to the D2 standard is input, movies the digital
Connected to the image signal terminal and input to the digital video signal terminal
The digital material video signal is a D2 standard signal.
Synchronize signal of D2 standard and synchronization detection
And D2 synchronous separation circuit for outputting a signal, said digital video
A digital sync separator which is connected to the signal terminal taking out a synchronizing signal from the digital material video signal, the D2 synchronization
A synchronization signal output and the output of the digital sync separator and synchronizing signal switching device for switching the pre <br/> SL D2 sync separator in accordance with the presence or absence of the synchronization detection signal input from the separation circuit, the synchronizing signal switching unit And a reference synchronization signal, and a phase comparison circuit that outputs a digital material video signal delay amount control signal based on the phase difference between them, and a digital material video signal and the digital material video signal delay amount control signal. A video signal delay circuit for adjusting a phase of the digital material video signal so as to match a reference phase.
2 standard video adjustment device.