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Pacific Security Network News ]
Do you know what the P and N systems of the analog camera mean? The analog camera has a lot of parameters, not a professional security industry. When you see these parameters, there is no clue. Today, Xiaobian will tell you what the P and N systems of the analog camera mean.
What does the P system of the analog camera mean?
PAL, NTSC, and SECAM, which are the current three color analog TV systems in the world. The so-called standard is a technical standard for processing video and audio signals jointly implemented by TV stations and television sets. Only the technical standards can realize the normal acceptance of the signals of the TV set. Just like the power sockets and plugs in the home, the specifications can be plugged together. The Chinese plugs can't be plugged into the UK-style power sockets. Only the standard ones can be docked smoothly.
The image display of the color TV is made up of a mixture of red, green and blue primary colors. The different brightness of the three color signals form a colorful color picture. How to deal with the three primary color signals, and to achieve broadcast and reception, requires certain technical standards, which form the format of color television. At present, there are three color TV systems with analog technology in the world, namely NTSC (also known as N, or American), PAL (also known as Par or West German, British), and SECAM (also Called Sekon or French). The distinction between the system is mainly due to the difference in frame rate (field frequency), the difference in decomposition rate, the difference in signal bandwidth and carrier frequency, and the difference in the conversion relationship of color space.
PAL (Phase Alternating Line) is a television system established in 1965. It is mainly used in China, Hong Kong, the Middle East and Europe. The color bandwidth of this system is 4.43Mh, and the audio bandwidth is 6.5Mhz, which is 25 frames per second.
The NTSC (National Television System Committee) standard is a color television broadcasting standard established by the National Television Development Committee in 1952. The United States, Canada, and Japan, Taiwan, South Korea, the Philippines and other countries use this system. The color bandwidth of this system is 3.58Mhz, the audio bandwidth is 6.0Mhz, and 30 frames per second.
Why NTSC is 30 frames per second, and PAL is 25 frames per second. This is because the power supply of the country using NTSC is 110V\60HZ, so the field frequency signal in the TV directly samples the frequency of the AC power source 60HZ because The two fields form a frame, so 60 divided by 2 equals 30 is exactly the number of frames of the TV, and China's mains is 220V\50HZ, so the reason is the same as 25 frames per second.
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