Aperture correction circuitry for a video correction system

Details Aperture correction circuitry for a video correction system Aperture correction circuitry for a video correction system

1977-01-19

1978-03-21

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358169, H04N 514, H04N 514

Patent

active

040806278

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 where the black level of the video signal is controlled by a black level control circuit. The disclosed video processing system is further adapted for fabrication in integrated circuit form.

REFERENCES:
patent: 3549901 (1970-12-01), Ross et al.
patent: 3849792 (1974-11-01), Holzrichter
patent: 4030121 (1977-06-01), Faroudja

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