Video signal peaking system

Details Video signal peaking system Video signal peaking system

1982-07-02

1985-04-02

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, 358 37, H04N 514

Patent

active

045090807

ABSTRACT:
In the luminance channel of a color TV receiver, a horizontal peaking signal representative of the difference between delayed and undelayed luminance signals is subject to coring, with the level of coring subject to variation. Residual peaking signal remaining after core cancellation, is subject to gain controlled signal translation, and then combined with luminance signal to form peaked luminance signal. Frequency selective amplifier, responsive to peaked luminance signal, supplies its output to peak detector. Control voltage developed by peak detector adjusts gain of peaking signal translator in sense opposing amplitude variations of detector input, providing compensatory gain variations when coring level changes affect residual peaking signal amplitude.

REFERENCES:
patent: 4142211 (1979-02-01), Faroudja
patent: 4167749 (1979-09-01), Burrus
patent: 4316210 (1982-02-01), Wharton
patent: 4399460 (1983-08-01), Harwood et al.
patent: 4437123 (1983-03-01), Harlan
patent: 4437124 (1983-03-01), Cochran
Article by R. H. McMann, et al. entitled "Improved Signal Processing Techniques for Color Television Broadcasting" appearing on pp. 221-228, of the Mar. 1968, issue of the SMPTE Journal.

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