Video processing system providing gain control, aperture control

Details Video processing system providing gain control, aperture control Video processing system providing gain control, aperture control

1977-01-19

1978-08-29

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358172, 358174, H04N 514, H04N 518, H04N 552

Patent

active

041107900

ABSTRACT:
A video processing system for a television receiver is shown. The video processing system includes a gain controlled stage through which a video signal is coupled. The gain of the stage is controlled to provide contrast control of the video signal. The video signal is also applied to an aperture correction circuit which develops an aperture correction signal including pre-shoot and over-shoot transient responses. The aperture correction signal is also coupled through the gain controlled stage so that it is amplified or attenuated by the same amount as the video signal. The output of the gain controlled stage is coupled to an output stage. A portion of the video signal from the output stage is compared to a reference voltage in a black level control circuit. The control signal from the black level control circuit is applied to the output stage to control the black level of the video signal. The disclosed video processing system is further adapted for fabrication in integrated circuit form.

REFERENCES:
patent: 3569620 (1971-03-01), Baun
patent: 3928867 (1975-12-01), Lynch
patent: 4030125 (1977-06-01), Bedell et al.

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