H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/63
H04N 9/64 (2006.01) H04N 9/78 (2006.01)
Patent
CA 1269449
COMB FILTER "HANGING DOT" ELIMINATOR Abstract Interline comb filter provides a comb filtered luminance signal output, and a second output inclusive of a comb filtered chrominance component and a vertical detail component. A low pass filter selects vertical detail component from second output for (1) restoring vertical detail information to comb filtered luminance signal, and (2) for application to a magnitude detector. Detail-restored signal is supplied via a delay device (with delay equal to one-half period of chrominance subcarrier) to a first multiplexer input. Combination of detail-restored signal with output of delay device provides an output subject to chrominance subcarrier trapping action, which output is supplied to a second multiplexer input. Control signal derived from magnitude detector output enables multiplexer to pass signal from first input when vertical detail signal magnitude is below predetermined threshold value, and to otherwise pass signal from second input.
495984
Craig Wilson And Company
Rca Licensing Corporation
LandOfFree
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