Brightness control apparatus

Details Brightness control apparatus Brightness control apparatus

1976-08-19

1977-08-23

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358168, 358172, H04N 9535, H04N 558, H04N 518

Patent

active

040443752

ABSTRACT:
A brightness control circuit for a color television receiver including means for amplifying color representative 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.

REFERENCES:
patent: 3804981 (1974-04-01), Avins

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