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公开(公告)号：EP0221734A2
公开(公告)日：1987-05-13
申请号：EP86308258.2
申请日：1986-10-23
发明人： Wargo, Robert Andrew
CPC分类号： H04N9/646
摘要： A dot interference detector for a video signal processor including a comb filter (10) detects (20) the respective phases (
摘要翻译： 包括梳状滤波器（10）的视频信号处理器的点干扰检测器检测（20）通常包含梳状滤波色度的彩色代表信息的频带中的信号的各个相位（
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公开(公告)号：EP0177285A2
公开(公告)日：1986-04-09
申请号：EP85306872.4
申请日：1985-09-27
CPC分类号： H03H21/0012 , H04N9/646
摘要： An adaptive filtering system is disclosed, which may be used in a digital television receiver to extract low frequency vertical detail information from a comb filtered chrominance signal. This system provides wide bandwidth vertical detail information when the amplitude of the chrominance component of the composite video signal is low and narrower bandwidth vertical detail signals as the amplitude of the chrominance component increases. Adaptive filtering is accomplished by passing the comb filtered chrominance signal through a first low-pass filter (14) and developing two reduced amplitude replicas (21,21) of the filtered signal which are mutually supplementary. The ratio of the amplitudes of these two replicas is variable with a control signal.
One replica is passed through a second low-pass filter (22) and combined (26) with the other replica to produce a vertical detail signal. The embodiment of the system that is disclosed includes means (41-46) for developing a control signal that is dependent on the instantaneous amplitude of the chrominance component of the composite video signal.-
公开(公告)号：EP0177285B1
公开(公告)日：1992-02-05
申请号：EP85306872.4
申请日：1985-09-27
CPC分类号： H03H21/0012 , H04N9/646
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公开(公告)号：EP0221734B1
公开(公告)日：1991-05-29
申请号：EP86308258.2
申请日：1986-10-23
发明人： Wargo, Robert Andrew
CPC分类号： H04N9/646
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