VCD影碟机一般只有AV输出,所以影响图象的清晰度。为了解决这一问题,本文介绍如何用梳状滤波器,把视频信号V分离成为亮度信号Y及色度信号C,达到用S端子输出的目的。 一、梳状滤波器的原理 为实现彩色电视和黑白电视兼容,并利用有限的频带,VCD等影像技术采用了频谱间置技术。即利用频谱不连续的特点,将色度信号调制在色副载波上,然后再插入亮度信号高频端的间隙处,成为视频信号输出。为实现亮度信号和色度信号分别输出,采用的分离措施有: 1.传统的分离方法——带通带阻方法 VCD player generally only AV output, so affect the image clarity. In order to solve this problem, this article describes how to use a comb filter to separate the video signal V into a luminance signal Y and a chrominance signal C to achieve the purpose of outputting with the S terminal. First, the comb filter principle To achieve color TV and black and white TV compatibility, and the use of limited frequency band, VCD and other video technology using spectrum inter-location technology. That is, the use of the characteristics of the spectrum is not continuous, the chrominance signal modulation on the color subcarrier, and then insert the luminance signal at the high-frequency side of the gap, a video signal output. To achieve the brightness signal and chrominance signals were output, the separation measures used are: 1. The traditional separation method - with passband resistance method