Adaptive filtering system

Details Adaptive filtering system Adaptive filtering system

H - Electricity

03

H

333/55, 350/72

H03H 21/00 (2006.01) H04N 9/64 (2006.01) H04N 9/78 (2006.01)

Patent

CA 1228669

Abstract An adaptive filtering system is disclosed. The system 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, developing two reduced amplitude replicas 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 and combined with the other replica to produce a vertical detail signal. The embodiment of the system that is disclosed includes means for developing a control signal that is proportional to the instantaneous amplitude of the chrominance component of the composite video signal.

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