Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1976-08-23
1978-05-16
Martin, John C.
Facsimile and static presentation processing
Static presentation processing
Attribute control
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
Bluestein Leo I.
Goyal Shri K.
GTE Laboratories Incorporated
Martin John C.
Walrath Robert E.
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