Method and device for detecting PAL type video signal subcarrier phase conversion

A phase conversion and video signal technology, applied in the field of television, can solve problems such as unstable detection results and achieve stable output results

Active Publication Date: 2011-05-11
CRM ICBG (WUXI) CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] The technical problem to be solved in the present invention is that when the existing PAL-Switch scheme detects the subcarrier phase conversion of the PAL video signal, the detection result is unstable when the signal is unstable or the noise is large

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  • Method and device for detecting PAL type video signal subcarrier phase conversion
  • Method and device for detecting PAL type video signal subcarrier phase conversion
  • Method and device for detecting PAL type video signal subcarrier phase conversion

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Embodiment Construction

[0047] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0048] The invention proposes an improvement scheme aiming at the defects existing in identifying PAL lines and NTSC lines in the existing PAL-Switch scheme, and further processes the PAL line and NTSC line identification signals obtained by the existing PAL-Switch scheme. The "obtaining preliminary identification signals of PAL lines and NTSC lines" mentioned in this article refers to the identification signals of PAL lines and NTSC lines obtained by using the existing PAL-Switch scheme. Correspondingly, the PAL row and NTSC row preliminary identification module refers to a circuit module for realizing the existing PAL-Switch solution.

[0049] figure 2 , image 3 and Figure 4 It is a flow chart of three schemes for identifying PAL lines and NTSC lines in th...

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Abstract

The invention discloses a method for detecting phase alternation line (PAL) type video signal subcarrier phase conversion, which comprises the following steps of: acquiring initial identification signals of a PAL row and a national television system committee (NTSC) row; acquiring local identification signals of the PAL row and the NTSC row; and comparing the local identification signals with theinitial identification signals, and outputting identification signals of the PAL row and the NTSC row according to the comparison result. A device for detecting the PAL type video signal subcarrier phase conversion comprises an initial identification module for acquiring the initial identification signals of the PAL row and the NTSC row, a local signal generating circuit, a statistical comparisonmodule and a logic control module. The method and the device for detecting the PAL type video signal subcarrier phase conversion finally output the local generated signals and have stable output results.

Description

technical field [0001] The invention belongs to the technical field of television, and relates to a detection method and a device for subcarrier phase conversion of a PAL video signal. Background technique [0002] The PAL (Phase Alternation Line, phase-by-line alternating) system is one of the analog color TV systems, and the other two analog color TV systems--SECAM (Sequential Couleur a Memoire, sequential color transmission and storage), NTSC (National Television System Committee, International Television System Committee) and called the three major systems of analog color TV. The NTSC system is a compatible color television system successfully developed in the United States in 1953. According to the composition characteristics of the chrominance signal, this system is also called the quadrature balanced amplitude modulation system. In order to reduce the mutual interference between the luminance signal and the chrominance signal, the chrominance signal is usually modul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/45
Inventor 尹圣宝吴晓春薛亮
Owner CRM ICBG (WUXI) CO LTD
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