Luminance and chrominance signal separating apparatus

Details Luminance and chrominance signal separating apparatus Luminance and chrominance signal separating apparatus

1995-03-30

1996-04-16

Groody, James J.

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348667, H04N 978

Patent

active

055087531

ABSTRACT:
A luminance and chrominance signal separating apparatus includes a first delay device for delaying an input chrominance color television signal by one horizontal period and a second delay device for delaying a reference signal one horizontal period. An output of the first delay device is regarded as a reference signal. Two correlation detectors detect correlations between the reference signal and the signals separated from the reference signal by one horizontal period. A black level detector detects a black level of the reference signal. Filters separate a chrominance signal from the reference signal. A selector selects one of the outputs of the filters based on the output of the correlation detectors and the output of the black level detector. A bandpass filter limits a bandwidth of the selector output and outputting a chrominance signal. A subtracter subtracts the chrominance signal obtained from the bandpass filter from the reference signal and outputs a luminance signal.

REFERENCES:
patent: 5394193 (1995-02-01), Kim
UK Search Report dated Jun. 15, 1995.

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