Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-01-19
1978-03-28
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358161, 358243, H04N 514, H04N 568
Patent
active
040818381
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 gain of the gain controlled stage is also automatically controlled in response to a beam current feedback to provide automatic contrast or white level control. In addition, the automatic control circuit provides beam circuit limiting by reducing the gain of the gain controlled stage to minimum in response to beam currents in excess of a threshold. An 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: 3804981 (1974-04-01), Avins
patent: 3928867 (1975-12-01), Lynch
Buffton Thomas H.
GTE Sylvania Incorporated
O'Malley Norman J.
Richardson Robert L.
Walrath Robert E.
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