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Method and related device for video signal phase-locking

A video signal and phase-locking technology, applied in the direction of differential synchronization source locking, color burst, etc., can solve the problems of phase-locking errors, increase the complexity of the phase-locking mechanism, and difficulty in phase-locking, and achieve the effect of streamlining the phase-locking mechanism

Inactive Publication Date: 2013-09-18
MSTAR SOFTWARE R&D (SHENZHEN) LTD +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different frequencies and complex and variable phases will make phase locking difficult
Even if a given frequency has been used to lock its color burst signal in a certain line signal, if the given frequency continues to be used in another type of color burst signal of the next line signal, the frequency difference between two different types of color burst signals It will be reflected in the phase error, resulting in phase-locking error; if the frequency is changed in the second-line signal, the complexity of the phase-locking mechanism will be greatly increased

Method used

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  • Method and related device for video signal phase-locking
  • Method and related device for video signal phase-locking
  • Method and related device for video signal phase-locking

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[0049] Please refer to figure 1 , which shows a video signal 10, for example, a video signal under the SECAM system. A plurality of image fields are arranged in sequence in the video signal 10, such as figure 1 Two adjacent fields FL(k0+k) and FL(k0+k+1) in . Fields FL(k0+k) and F(k0+k+1) can be two fields before and after the same frame; for example, one of the fields is an odd field, and the other field is in the same frame Pair field. There is a period in the field FL(k0+k) corresponding to vertical blanking, and N1 pen line signals L(i0), L(i0+1) to L(i0+N1-1) are arranged in sequence; similar Similarly, the field FL(k0+k+1) also arranges N2 pen-line signals L(i0+N1), L(i0+N1+1) to L(i0+N1+N2) after a vertical blank period. For example, under the 625-line SECAM system, there are 313 line signals L(i0) to L(i0+312) in the odd field, and 312 line signals L(i0+313) to L in the even field (i0+624); Among them, the line signals L(i0), L(i0+313), L(i0+1), L(i0+314) will res...

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Abstract

The invention provides a method and a related device for video signal phase-locking. A video signal comprises a plurality of fields, a plurality of first line signals and second line signals are sequentially arranged in a staggered mode in each of the fields, and each first line signal is provided with a corresponding first color burst signal. According to the invention, a phase mode is first provided in a first field according to phases of a preset number of first color burst signals, then a corresponding reference phase is provided for each first color burst signal of a second field according to the phase mode under a first mode switching principle, and phase locking is carried out on each first color burst signal of the second field according to the reference phases. If phase locking fails, a reference phase is provided for each first color burst signal of a fourth field according to the phase mode of a third field under a second mode switching principle.

Description

technical field [0001] The present invention relates to a method and related device applied to video signal phase locking, in particular to a video signal phase locking method and related device capable of adapting to complex phase relationships in video signals with a streamlined process. Background technique [0002] In order to encode and modulate dynamic audio-visual information into video signals for the convenience of transmission, broadcasting and circulation, TV standards such as NTSC (National Television System Committee), PAL (Phase Alternate Line) and SECAM (Sequential Color with Memory) have been formulated in the world. . Generally speaking, dynamic audio-visual information presents dynamic images with static images of different frames (frames) in sequence; in order to carry the information of each frame in the video signal, the images of each frame will be disassembled at most Each horizontal line in the same frame will be grouped into two different fields (fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/475
Inventor 翁尉书
Owner MSTAR SOFTWARE R&D (SHENZHEN) LTD
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