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1. 发明授权

US5353066A Method for preventing the deterioration of picture quality in a video processor and circuit thereof 失效
标题翻译：用于防止视频处理器及其电路中的图像质量恶化的方法
公开(公告)号：US5353066A
公开(公告)日：1994-10-04
申请号：US147570
申请日：1993-11-05
申请人： Chan-gu Lee
发明人： Chan-gu Lee
IPC分类号： H04N9/78 , H04N9/44 , H04N9/70 , H04N9/77 , H04N5/12 , H04N9/455
CPC分类号： H04N9/70
摘要： A method and circuit for preventing the deterioration of picture quality in a video processor is disclosed in which, when an input color video signal is input, a clock signal for a combfilter is locked with a phase-locked loop (PLL) by a burst signal and when a monochrome video signal without the burst signal is input, the clock signal is locked by the output (quasi-burst signal) of a voltage-controlled oscillator of the PLL circuit, before the lapse of one horizontal period, so that the clock signal is constantly locked by a multiple (4 fsc) of the burst signal regardless of the presence or absence of the burst signal of the input video signal. According to a color/mono signal discriminating result, either the burst signal or the quasi-burst signal is selected as a reference signal so that the reference signal is locked to provide a clock signal having a constant phase and frequency, thereby preventing aliasing due to clock variations when the monochrome signal is input and thus improving picture quality.
摘要翻译：公开了一种用于防止视频处理器中图像质量恶化的方法和电路，其中当输入输入彩色视频信号被输入时，梳状滤波器的时钟信号通过脉冲串信号被锁相环（PLL）锁定并且当输入没有脉冲串信号的单色视频信号时，在经过一个水平周期之前，时钟信号被PLL电路的压控振荡器的输出（准脉冲串信号）锁定，使得时钟不管输入视频信号的突发信号的存在或不存在，信号都被多个（4fsc）的突发信号锁定。根据颜色/单声道信号鉴别结果，选择突发信号或准突发信号作为参考信号，使得参考信号被锁定以提供具有恒定相位和频率的时钟信号，由此防止由于当单色信号被输入时，时钟变化，从而提高图像质量。

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