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
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[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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