Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1982-01-18
1984-07-03
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 27, 358 37, H04N 952, H04N 9535
Patent
active
044582633
ABSTRACT:
In a video signal processing circuit for a color television receiver, a brightness setting, which is operative for external color signals as well as for internal color signals and which does not produce a color shift, can be obtained by combining with the luminance signal (Y) a level shift signal (H) the amplitude of which is adjustable by the brightness setting and by employing in each color channel two clamping circuits, the first one of which clamps a first reference level (RL.sub.1) in the external color signal (ER, EG, EB) onto a combination of the level shift signal and the internal color signal (R, G, B) and the second clamping circuit clamps a second reference leve (RL.sub.2) which occurs in the sum signal of the internal and the external color signal when the level shift signal has zero value, onto the cutoff level of the relevant electron gun of a picture display tube.
REFERENCES:
patent: 3588827 (1971-06-01), Vanroessel
patent: 3689689 (1972-09-01), Weitzsch
patent: 3952327 (1976-04-01), Hofman
patent: 4167750 (1979-09-01), Tomimoto
Briody Thomas A.
Chin Tommy P.
Goodman Edward W.
Streeter William J.
U.S. Philips Corporation
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