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Detection method and device of SECAM video signal subcarrier type

A video signal and subcarrier technology, applied in the field of television, can solve the problems of high complexity, achieve the effect of reducing complexity, realizing simplicity and strong practicability

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

AI Technical Summary

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

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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

[0055] In the embodiment of the present invention, the number of times that the subcarriers of two adjacent rows of blanking scan lines pass through the zero point is respectively calculated, and the number of times that the subcarriers of the two adjacent rows of blanking scan lines pass through the zero point is compared in value, and the phase is determined according to the comparison result. The subcarrier type of the scan line is blanked in two adjacent lines to reduce the complexity of detection.

[0056] The method of the embodiment of the present invention is based on the following considerations:

[0057] As shown in Figure 1, when a SECAM video signal is being transmitted, an image contains 625 scan lines, which are divided into 4 fields for transmission. The 625 scanning lines include active scanning lines, blanking scanning lines, and field synchronous scanning lines. The active scanning line is located during the scanning process and is used to transmit video sig...

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Abstract

This invention discloses a test method for testing sub-carrier kind of SECAM video signals including: computing times passing through zero point by sub-carriers of two adjacent blanking scanning lines, comparing the values of the times to determine kinds of the sub-carrier of the two blanking scanning lines based on the compared result. This invention also discloses a test device for testing kind of sub-carrier of the SECAM video signals.

Description

technical field [0001] The invention relates to the field of television technology, 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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IPC IPC(8): H04N9/45
Inventor 张幼京桂文明
Owner VIMICRO CORP