Automatic sharpness control circuit for a television receiver

Facsimile and static presentation processing – Static presentation processing – Attribute control

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Details

358166, H04N 9535, H04N 514

Patent

active

040902170

ABSTRACT:
An automatic sharpness control circuit for a color television receiver, wherein a filter having a variable filtering characteristic establishes the peaking of the frequencies forming the video signal, includes a varactor diode as the control element for the variable characteristic filter. The automatic gain control signal establishes the bias condition of the varactor diode so that the extent of peaking in the frequencies forming the video signal is automatically reduced as the strength of the video signal decreases. Accordingly, a balancing effect is created between desirable picture sharpness and the degrading effect of accentuated picture noise.

REFERENCES:
patent: 2514112 (1950-07-01), Wright et al.
patent: 3495031 (1970-02-01), Poppa
patent: 3693094 (1972-09-01), Kanamaru et al.
patent: 3706846 (1972-12-01), Siwko
patent: 3931637 (1976-01-01), Carpenter

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