Brightness control circuit with predictable brightness control r

Details Brightness control circuit with predictable brightness control r Brightness control circuit with predictable brightness control r

1977-05-12

1979-01-16

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358168, 358 39, H04N 568

Patent

active

041352009

ABSTRACT:
An image brightness control arrangement for a color video signal processing system including a plurality of amplifiers each responsive to luminance and separate color difference signals for developing color representative output signals. A brightness control (e.g., a potentiometer) also is included for varying a brightness determinative D.C. level of the luminance signal. A locally generated periodic keying signal, occurring during periodic image blanking intervals of the video signal and of a magnitude which may vary undesirably, is coupled to each of the amplifiers for establishing a reference level for the color difference signals, as described in U.S. Pat. No. 3,970,895. A derived signal indicative of the magnitude of the keying signal is coupled to the brightness control for establishing a brightness control range thereof.

REFERENCES:
patent: 3502807 (1970-03-01), Anderson

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