Sampled data vertical detail signal processor

Details Sampled data vertical detail signal processor Sampled data vertical detail signal processor

1983-11-28

1985-12-10

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 36, 358 37, 358166, H04N 5213, H04N 978

Patent

active

045583528

ABSTRACT:
In a television receiver, apparatus for non-linearly processing a vertical detail signal includes first and second cascaded amplifiers which exhibit linear and limiting regions for processing a vertical detail signal. A first keyed sample and hold circuit provides detail signal amplitude samples to the first amplifier. A second keyed sample and hold circuit provides amplitude samples of sampled detail signals from the output of the first amplifier, to the second amplifier. The sampling circuits operate at different times such that the second sampling circuit is operative in a sampling state at times when the first sampling network is inoperative and exhibits a holding state. Output detail signals from the first and second amplifiers are combined with a linear version of the vertical detail signal to produce a combined, output vertical detail signal manifesting signal coring, amplification, and paring (attenuation) over selected amplitude ranges.

REFERENCES:
patent: 4262304 (1981-04-01), Faroudja
patent: 4295160 (1981-10-01), Lagoni
D. J. Sauer, "Design and Preformance of a CCD Comb Filter IC," RCA Review, vol. 41, Mar. 1980, pp. 29-56.
An article by N. J. Kiser et al., titled "CCD Comb Filter and Defect Corrector System for Video Disc Application", appearing on pp. 49-53, of the Nov./Dec. 1981 issue of RCA Engineer (published by RCA Corporation, Princeton, N.J.).
Copending concurrently filed U.S. patent application Ser. No. (RCA 76978) of D. H. Pritchard et al., titled "Non-Linear Processor for Video Signal Vertical Detail Component."

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