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目前国内通用的LC滤波器吸收回路,价格低廉,但群延时特性较差,带通内相位特性曲线失真严重.随着电视机屏幕的增大,图象清晰度与瞬态响应的矛盾日渐突出.目前国内许多电视机生产厂在通道方面解决这一问题的办法之一是采取牺牲视放高端增益,亦即牺牲图象清晰度来改善瞬态响应.这办法对小屏幕低档机还可应付,而对日益增大的屏幕,越来越高的图象质量要求,就不免捉襟见肘了.
At present, the common LC filter absorption circuit in our country is low in price, but the group delay characteristic is poor and the phase characteristic curve in the bandpass is distorted seriously. As the screen of the television increases, the contradiction between the image sharpness and the transient response increases day by day Highlight.At present, many TV manufacturers in the channel to solve this problem is one of the ways to take the high-end amplifier at the expense of gain, that sacrifice the image clarity to improve the transient response.This method of small-screen low-end machine also To deal with, and the growing screen, higher and higher image quality requirements, can not help but stretched.