Circuit for controlling picture quality in a video reproducing a

Details Circuit for controlling picture quality in a video reproducing a Circuit for controlling picture quality in a video reproducing a

1992-03-13

1993-12-21

Chin, Tommy

Facsimile and static presentation processing

Facsimile

Recording apparatus

358327, 358329, 358336, H04N 979, H04N 594

Patent

active

052725413

ABSTRACT:
A circuit for controlling picture quality of a video reproducing apparatus, wherein the circuit optimally compensates the frequency characteristic at different magnitudes according to the degree of minuteness of the reproduced video signal. The circuit for controlling picture quality in a video reproducing apparatus is composed of a picture controller for varying the frequency characteristic of the reproduced video signal, a comb filter for detecting the quantity of correlations between scanning lines of the reproduced video signal, a high band component detector for detecting the high band component signal from the reproduced video signal, and a mixing circuit for combining the outputs of the comb filter and the high band component detector and supplying the result to a picture quality controller, thereby controlling variation in the frequency characteristics of the reproduced video signal.

REFERENCES:
patent: 3961359 (1976-06-01), Okuno et al.
patent: 4766487 (1988-08-01), Tanaka et al.
patent: 4922331 (1990-05-01), Ezaki

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