Brightness control apparatus

Details Brightness control apparatus Brightness control apparatus

H - Electricity

04

N

350/73

H04N 5/58 (2006.01) H04N 5/18 (2006.01) H04N 9/72 (2006.01)

Patent

CA 1093206

RCA 70,904 BRIGHTNESS CONTROL APPARATUS Abstract of the Disclosure A brightness control circuit for a color tele- vision receiver including means for amplifying color repre- sentative signals (e.g., color difference signals) and means for amplifying luminance signals comprises a source of periodic keying signals occurring during blanking intervals of the luminance signals, and first and second keyed clamping networks. The first clamping network clamps the color representative signals to a first reference voltage in response to the keying signals, and the second clamping network clamps the blanking intervals of the luminance signals to a second reference voltage, representing a black tone of a reproduced image, in response to the keying signals. The first and second reference voltages are in predetermined relation and dependent upon the keying signals. An adjustable brightness control is coupled to the second clamping network for varying the second reference voltage level and therefore the black tone reference level and the brightness of a reproduced image. - 1 -

283905

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