Adaptive control of the chrominance signal frequency response in

Details Adaptive control of the chrominance signal frequency response in Adaptive control of the chrominance signal frequency response in

1985-03-19

1987-03-17

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 31, 358 40, H04N 964, H04N 977

Patent

active

046511962

ABSTRACT:
A digital television receiver, which uses a comb filter to separate the luminance and chrominance components of composite video signals, includes an adaptive band-pass filter for processing the comb filtered chrominance signals. Comb filtered chrominance signals may include luminance vertical detail information at the relatively high frequencies also occupied by chrominance information. The adaptive band-pass filter is controlled to have a narrow bandwidth when significant amounts of this relatively high frequency vertical detail information are present and to have a wide bandwidth otherwise. Consequently, the bandwidth of the chrominance signal provided by this filter is restricted only when it is necessary to prevent distortion, and vertical detail is added to the luminance signal only when it is not likely to be contaminated with chrominance information.

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patent: 4472733 (1984-09-01), Bolger

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