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彩色电视三大制式(NTSC、PAL、SECAM)遍及世界各国已三十年了,在电路器件、调谐控制、整机功能及显示器件等方面有了飞速发展。然而,电视观众最为关心的图像质量因受复合编码传输及隔行扫描所限,无明显改善,水平清晰度和垂直清晰度为300线左右,随着屏幕的大型化倾向,使行结构、行闪烁、爬行、大面积闪烁和亮色间互串等缺陷更为显著。一、现行广播彩色电视的缺陷(一)频率多重复合编码传输方式的缺陷现行的模拟彩电中没有良好的亮、色分离措施,难于解决 Y(亮度)与 C(色度)分解力之间的矛盾以及
The three major formats of color TV (NTSC, PAL, SECAM) have been around the world for 30 years and have been rapidly developed in terms of circuit devices, tuning control, machine functions and display devices. However, the quality of the image that the television viewer is most concerned about is limited by composite code transmission and interlacing. There is no obvious improvement in horizontal resolution and vertical resolution of about 300 lines. With the increase in screen size, the line structure and the line flicker , Crawling, large area flashing and bright color inter-string defects such as more significant. First, the current radio and television color defects (A) the frequency of multiple complex encoding transmission defects The current analog color TV does not have good light and color separation measures, it is difficult to solve the Y (brightness) and C (color) between the decomposition Conflicts as well