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Detection method and device of SECAM video signal subcarrier type

A technology of video signal and detection method, which is applied in the field of television, can solve the problems of high complexity, achieve the effect of reducing complexity, strong practicability, and simple implementation

Inactive Publication Date: 2007-12-19
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Embodiments of the present invention provide a method and device for detecting subcarrier types of SECAM video signals to solve the problem of high complexity in detecting the subcarrier types of SECAM video signals in the prior art

Method used

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  • Detection method and device of SECAM video signal subcarrier type
  • Detection method and device of SECAM video signal subcarrier type
  • Detection method and device of SECAM video signal subcarrier type

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Embodiment Construction

[0038] In the embodiment of the present invention, the average value of the color burst signal amplitude of the previous row and the current row is obtained, and the two are compared in magnitude, and the subcarrier type of the current row is determined according to the comparison result, which is simple and easy to implement and has strong practicality.

[0039] The method of the embodiment of the present invention is based on the following considerations:

[0040] When the SECAM video signal is transmitted, each scanning line corresponds to a type of subcarrier. If a scanning line transmits a red difference signal (R-Y), the scanning line corresponds to a subcarrier F with a frequency of 440MHz. OR ; If a row of scanning lines transmits the blue difference signal (B-Y), then the corresponding frequency of the row of scanning lines is the subcarrier F of 425MHz OB .

[0041] At the beginning of each scanning line, there is a segment of sub-carrier not modulated with any col...

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PUM

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Abstract

This invention discloses a method for testing sub-carrier kind of SECAM video signals including: obtaining mean values of amplitudes of chromatic synchronous signals of the last line and the current line, comparing the values of the mean values of the current line with that of the last to decide the sub-carrier kind of the current line based on the result. This invention also discloses a test device.

Description

technical field [0001] The invention relates to the technical field of television, in particular to a method and a device for detecting the subcarrier type of a SECAM video signal. Background technique [0002] SECAM (Séquential Couleur a Mémoire, sequential transmission color and storage) system is one of the analog color TV systems. The difference from other analog color TV systems is that the red difference signal (R-Y) and the blue difference signal (B-Y) are transmitted line by line. ). Since only one color-difference signal exists in the transmission channel at the same time, the cross-talk phenomenon of color-difference signals is avoided. [0003] Since the red difference signal (R-Y) and the blue difference signal (B-Y) use subcarriers of different frequencies for FM modulation, the red difference signal (R-Y) uses a subcarrier F with a frequency of 440MHz OR For FM modulation, the blue difference signal (B-Y) uses a subcarrier F with a frequency of 425MHz OB FM ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/45
Inventor 张幼京桂文明
Owner VIMICRO CORP
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