Currently, the video portion of the home theater is mainly composed of a signal source (video source) and a large-screen color TV or projector. Their composition is relatively simple compared to audio equipment, and is mainly described around the composition of the image.
Watching the picture tube of the TV carefully, you can see that it is made up of thousands of tiny highlights. The highlights are divided into red, green and blue colors, which are arranged in an orderly manner on the picture tube. Red, green and blue highlights can form a pixel. Everyone knows that any color can be blended from red, green and blue. Changing the proportion of the intensity of the red, green, and blue colors will directly affect the overall color of the pixel. When the electron beam in the picture tube is scanned onto the picture tube screen, it reacts with the fluorescent substance on the screen to produce a ten-red, green, and blue bright spot. Since the luminous intensity of every ten bright spots can vary with the intensity of the electronic illuminating, changing the intensity of the electron beam can change the luminous intensity of each bright spot. Red, green, and blue highlights of different brightness intensities can form pixels of different colors and brightness. Since the faces of red, green and blue bright spots are small, outside the normal distance, people's vision can only feel the color and brightness of the pixels. Thousands of pixels of different colors and brightness form a still image. A still image that alternates rapidly produces a moving image.
It can be seen that the moving image signal can be decomposed into a still image, and each still image is composed of thousands of pixels. The change of the pixel is related to the change of the intensity of the electron beam through the change of the three bright spots of red, green and blue. Finally, people can control the change of the pixel by the change of the electron beam, thereby using the scanning of the electron beam to " Draw "various images.
Technically, a video signal is composed of an electrical signal carrying information such as image chromaticity, brightness, and the like. In the long-term technology development process, video signals and corresponding equipment have formed a variety of technical specifications and standards, making the current world of color system storage situation.
NTSC is the abbreviation of the American Television System Association. The NTSC color system was officially confirmed in 1953. In 1934, the United States began to adopt this system, and Japan, Canada, and Taiwan Province of China have successively adopted it. The NTSC color system is one of the most used formats for pre-software sources.
PAI. It is a color system made by Germany. It has been selected by most European countries such as Germany, Dianfu, and Zhifuli. Since the PAL system overcomes the shortcomings of NTSC (the color cut type is highly distorted during broadcast transmission, this system is also adopted in China.
The SECAM system is a color system created by France. It has been adopted by France, the former Soviet Union, and Eastern Europe and the Middle East.
Throughout the three color systems, the NTSC system is relatively simple, and the video playing in the AV studio is better in the home theater . The i-AI. system is relatively complicated, and is used for broadcast reception. The color distortion is small, suitable for broadcast transmission; the SECAM system is complicated, and the image definition device is slightly worse than NTSC and PAI, and the two types are slightly worse, which are relatively rare on the market.
It is not difficult to see from the above that in the home theater system in the Chinese market, the format used by video equipment should be NTSC and PAI, and the two color systems should coexist. The advantage of being compatible with both receiving and playing is that it gives people the opportunity to watch more videos, and at the same time creates convenience for international software communication.
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