Contour compensating circuit

Details Contour compensating circuit Contour compensating circuit

1988-05-19

1989-06-13

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, 358162, 358 96, H04N 514, H04N 5208

Patent

active

048397253

ABSTRACT:
To adjust frequency characteristics (e.g. peak frequency or emphasizing frequency range) of a contour compensating circuit (i.e. edge emphasizer) for correcting scanning beam aperture distortion of a video camera, for instance, the contour compensating circuit comprises a first delay line for delaying a first signal Sa into a second signal Sb; a second delay line for delaying the second singal Sb into a third signal Sc; and a matrix mixer for mixing three signals Sa, Sb and Sc at a matrix mixture ratio of (.alpha.-1):-.alpha.:1 and outputting the mixed signal Sd=Sc-.alpha.Sb+(.alpha.-1 Sa as a contour compensating signal. The above mixture ratio is controllled on the basis of an automatic gain control detection voltage derived from the AGC circuit for the video camera.

REFERENCES:
patent: 3995108 (1976-11-01), Morrison
patent: 4142211 (1979-02-01), Faroudja
patent: 4275417 (1981-06-01), Esashika
patent: 4654709 (1987-03-01), Umezawa

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