Method and device for detecting SECAM (Sequential Colour and Memory) system

A detection method and a technology of a detection device, which are applied to color TV parts, electrical components, color TVs, etc., can solve problems such as long time consumption and complexity, and achieve the effects of simple structure, increased accuracy, and simple judgment methods

Active Publication Date: 2015-03-04
ARKMICRO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Obviously, to support the detection of several standards, it takes several cycles to complete the judgment process of the entire standard, which consumes a long time and is more complicated

Method used

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  • Method and device for detecting SECAM (Sequential Colour and Memory) system
  • Method and device for detecting SECAM (Sequential Colour and Memory) system
  • Method and device for detecting SECAM (Sequential Colour and Memory) system

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Embodiment Construction

[0049] like figure 1 Shown is a schematic diagram of the difference between the SECAM system, PAL system and NTSC system in the back shoulder area of ​​line blanking. Among the three systems, PAL system and NTSC system both use amplitude modulation modulation, and SECAM system uses frequency modulation. In the back porch area, the PAL system and NTSC system include 9±1 cycle color burst signals in the line blanking back porch, and the non-color burst signal area in the line blanking back porch has only DC level, while the SECAM system has a color burst signal in the entire line blanking area. The hidden back shoulder area all retains an AC level with a frequency of 4.25MHz or 4.406MHz. The specific embodiment of the present invention utilizes the difference between the SECAM system and the PAL system and NTSC system to complete the detection of the SECAM system.

[0050] like figure 2 Shown is the flow chart of a kind of SECAM standard detection method in the first embodimen...

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Abstract

The embodiment of the invention discloses a method for detecting an SECAM (Sequentiel Couleur Avec Memoire) system, and the method comprises the following steps of: filtering interferences and noise waves outside color subcarrier frequencies of a row blanking back porch in an input signal through a filtering method; after filtering, respectively subtracting a signal value of the row blanking back porch by signal values of all pixels, retaking an absolute value, and obtaining the absolute value of a signal difference of each pixel; arranging one area in the row blanking back porch; accumulating absolute values of signal differences of the pixels in the arranged area, obtaining an accumulated value, and comparing the accumulated value with one set threshold value; and judging the system of a current input signal whether is the SECAM system. The invention also discloses a corresponding device for detecting the SECAM system. In the technical scheme disclosed by the invention, the SECAM system can be quickly accurately detected.

Description

technical field [0001] The invention relates to the field of video signal processing, in particular to a method and device for judging the standard of a TV video signal. Background technique [0002] Traditional analog TV signals include NTSC, PAL, and SECAM, and SECAM is one of them. The difference between the SECAM system and the NTSC and PAL systems is that the SECAM system is a sequential-simultaneous system, and the modulation method of the color-difference signal to the subcarrier adopts a frequency modulation method. The color difference signals (R-Y) and (B-Y) are sequentially transmitted row-by-row by sequential-simultaneous system, so only one signal exists in the transmission channel at the same time, avoiding cross-color and color distortion caused by it. In the way of frequency modulation, the differential phase distortion introduced in the transmission will not affect the color of a large area, but only the color on the vertical boundary will be changed. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/45
Inventor 严卫健高夫李汉光石岭
Owner ARKMICRO TECH
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