Control system for luminance/chrominance signal processing circu

Details Control system for luminance/chrominance signal processing circu Control system for luminance/chrominance signal processing circu

1983-12-14

1985-11-19

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 74, 358 65, 358 33, H04N 568, H04N 916, H04N 920, H04N 324

Patent

active

045545880

ABSTRACT:
A color television receiver includes AKB control circuits, operative during periodically recurring kinescope bias control intervals, for automatically adjusting the cathode biases of the receiver's color kinescope. To ensure the integrity of the bias adjustment operations undertaken by the AKB control circuits, the receiver is provided with a control system which includes: (1) keyed luminance/chrominance gain control apparatus, serving to effectively disable luminance and chrominance signal amplifiers during each kinescope bias control interval; (2) keyed brightness control apparatus for rendering the DC levels of color signal inputs to the receiver's kinescope drivers independent of the receiver's brightness control adjustment throughout each kinescope bias control interval; and (3) a control loop for controlling the DC level of the receiver's luminance channel output, which opposes departures of one of said color signal inputs from equality with a reference voltage throughout each kinescope bias control interval. A retrace blanking circuit, otherwise supplying beam cut-off biases to the kinescope cathodes during periods of beam retrace, is precluded from such cut-off bias application during beam retrace periods falling within the kinescope bias control intervals.

REFERENCES:
patent: 4263622 (1981-04-01), Hinn
patent: 4404593 (1983-09-01), Shanley et al.
patent: 4484228 (1984-11-01), Parker

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