Automatic peaking control circuitry for a video processing syste

Details Automatic peaking control circuitry for a video processing syste Automatic peaking control circuitry for a video processing syste

1977-01-19

1978-01-17

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, 358174, 307296A, H04N 514, H04N 552, H03K 100

Patent

active

040695050

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 a pre-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. An automatic peaking control circuit receives the pre-shoot and over-shoot signals to generate an automatic control signal to control the gain of the aperture correction circuit. A tracking control circuit causes the automatic peaking control circuit to accurately track the setting of an adjustable control which controls the gain of the aperture correction circuit. 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: 3389221 (1968-06-01), MacDonald
patent: 3518371 (1970-06-01), Brooks
patent: 3643011 (1972-02-01), Engel et al.
patent: 3935384 (1976-01-01), Jirka
patent: 3983576 (1976-09-01), Shanley et al.

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