Color video signal reproducing apparatus having trap circuit and

Details Color video signal reproducing apparatus having trap circuit and Color video signal reproducing apparatus having trap circuit and

1988-06-20

1990-05-01

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358315, 358 38, H04N 979

Patent

active

049223313

ABSTRACT:
A video signal reproducing apparatus has a filter circuit interposed in a transmission path for a reproduced luminance signal, and the characteristic of the filter circuit desirably includes a band-eliminating characteristic and a comb-filter passband characteristic which can be selectively emphasized. When the reproduced luminance signal has a normal or relatively smaller frequency bandwidth or a relatively small line correlation component, or when the level of the reproduced carrier chrominance signal is high, the band-eliminating characteristic of the filter circuit is emphasized. The foregoing video signal reproducing apparatus is particularly suited for reproducing a color video signal that includes a wide band luminance signal, in which case the comb-filter passband characteristic of the filter circuit is selected or emphasized so as to reduce noise near the color subcarrier frequency, to avoid displacement of a reproduced picture of high definition in the vertical direction and also to avoid interference caused by the vertical non-correlation component of a color picture.

REFERENCES:
patent: 3924266 (1975-12-01), Harwood
patent: 4748498 (1988-05-01), Yamanishi et al.

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