Luminance and chrominance signal separator using correlation det

Details Luminance and chrominance signal separator using correlation det Luminance and chrominance signal separator using correlation det

1994-10-20

1997-08-05

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348667, H04N 978

Patent

active

056547706

ABSTRACT:
A device that separates a luminance signal and a chrominance signal from an input composite color television signal, suppressing cross color interference and keeping a good color transient characteristic, by selecting characteristics of the color bandpass filters according to a vertical correlation value after obtaining a chrominance signal at an adaptive type comb filters. The apparatus includes a cascade connection of a plurality of delay devices each one of which delays one horizontal period; a correlation detecting circuit for outputting correlation values between the reference signal and a signal at the vertical vicinity of the point of the reference signal on the screen, where an output signal of the central delay device is regarded as a reference signal; comb filters for separating a chrominance signal from the composite color television signal; a plurality of bandpass filters for limiting the bandwidth of the chrominance signal obtained at the comb filters; and a mixing circuit for mixing the outputs of the bandpass filters according to the correlation values between the reference signal and the signal at the vertical vicinity of the point of the reference signal.

REFERENCES:
patent: 4855815 (1989-08-01), Yasuki et al.
patent: 4907073 (1990-03-01), Sugiyama
patent: 4982271 (1991-01-01), Sugiyama et al.
patent: 4994906 (1991-02-01), Moriwake
patent: 5194942 (1993-03-01), Sim et al.

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