Circuit for improving picture quality in a television receiver

Details Circuit for improving picture quality in a television receiver Circuit for improving picture quality in a television receiver

1980-02-15

1981-10-13

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358242, H04N 563

Patent

active

042951640

ABSTRACT:
A circuit for improving picture quality in a television receiver adapted to receive video signals, with light picture areas corresponding to a high video signal level bounded by inclined rising and falling edges comprising, circuit elements for producing a differentiated video signal from the received video signal having positive and negative peaks at the inclined rising and falling edges of the received video signal respectively, circuit elements for inverting the differentiated video signal and clipping the negative pulse thereof, and circuit elements for adding the inverted and clipped differentiated signal to the received video signal whereby the falling edge of the received video signal is enhanced and the picture quality is improved.

REFERENCES:
patent: 3641268 (1972-02-01), Beck
patent: 3839598 (1974-10-01), Okada
patent: 3980813 (1976-09-01), Shinkai
patent: 4072984 (1978-02-01), Kaiser
patent: 4080628 (1978-03-01), Jirka
patent: 4183064 (1980-01-01), Sahara et al.
A New Technique for Improving the Sharpness of TV Pictures, by C. Goldmark, Oct. 1951, Journal of the Smpte, vol. 57, pp. 382-397.
Description of the CBS Crispening Circuit, May 8, 1950.

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