Television receiver with picture level control

H - Electricity – 04 – N

Patent

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350/83

H04N 5/16 (2006.01) H04N 5/58 (2006.01)

Patent

CA 1048635

ABSTRACT OF THE DISCLOSURE Apparatus is provided for optimum adjustment of a television picture at all ambient light levels and power supply loading conditions with a minimum of manual adjust- ments. A light-responsive element is included to control the gain of luminance and chrominance amplifiers in prop- ortioned ratio and to adjust electrical black level to correspond to optical black level. Power supply sensing is included to reduce picture drive to prevent overload con- ditions while maintaining black level constant. Additional picture sensing reduces drive current on scense of high average brightness under low ambient light conditions.

225974

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