Vertical synchronizing signal generation appts. and video signal processing appts.

A vertical synchronization signal and generation device technology, applied in the field of signal processing, can solve the problems of discontinuous synchronization signal interval and synchronization confusion

Inactive Publication Date: 2004-08-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in this configuration, since the signal synchronizing with the vertical synchronizing signal of the input image and the signal of the free oscillation circuit are switched according to the presence or absence of the vertical synchronizing signal of the input image, the vertical synchronizing signal immediately after switching Intervals become discontinuous, synchronization confusion occurs

Method used

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  • Vertical synchronizing signal generation appts. and video signal processing appts.
  • Vertical synchronizing signal generation appts. and video signal processing appts.
  • Vertical synchronizing signal generation appts. and video signal processing appts.

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Embodiment Construction

[0062] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0063] (first embodiment)

[0064] FIG. 1 is a block diagram showing the configuration of a vertical synchronizing signal generator according to a first embodiment of the present invention. The vertical synchronization signal generating device 10 in FIG.

[0065] The luminance signal input to the vertical synchronous signal generator 10 of FIG. 1 is a signal separated from the image signal of the NTSC (national television system committee (International Television System Committee)) mode, and the clock pulse of the frequency fs is input into the vertical synchronous signal Separation circuit 11 , AFC circuit 20 , vertical synchronization signal phase detection circuit 30 and selector 12 .

[0066]The vertical synchronous signal separation circuit 11 separates the first vertical synchronous signal VS superimposed on the input luminance signal during its ve...

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Abstract

A device is provided with a vertical synchronizing signal separating circuit separating the vertical synchronizing signal of an input luminance signal and outputs it as a first vertical synchronizing signal, an automatic frequency control circuit generating and outputting a second vertical synchronizing signal having a repetition frequency equivalent to the average repetition frequency of the first vertical synchronizing signal, a vertical synchronizing signal phase detection circuit detecting whether the first vertical synchronizing signal alternately repeats the two periods and outputting the detection result as a discrimination signal and a selector receiving the first and the second vertical synchronizing signals and selecting and outputting the first vertical synchronizing signal when the discrimination signals shows that the first vertical synchronizing signal alternately repeats the two periods and the second vertical synchronizing signal in the other cases.

Description

technical field [0001] The present invention relates to signal processing of an apparatus for processing image signals, and more particularly to a technique for stably separating vertical synchronizing signals of image signals. Background technique [0002] Devices that display, record and reproduce video signals, such as televisions and VTRs (video tape recorders), perform signal processing based on the synchronous signal superimposed during the loop period of the video signal. Therefore, in order to stably perform display, recording and reproduction, it is necessary to always perform stable synchronization signal separation regardless of the quality of the input video signal. For example, in Japanese Patent Publication No. 01-71280 published in 1999, it is disclosed that in order to stabilize the separated horizontal synchronous signal, the separated horizontal synchronous signal itself is not used, but the signal generated by the automatic frequency control circuit (AFC c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/10H04N5/12
CPCH04N5/12H04N5/10H04N5/08
Inventor 藤井邦彦三好敏博藤本和秀汤峰学则竹俊哉
Owner PANASONIC CORP
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