The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 1985
Filed:
Dec. 14, 1983
Robert L Shanley, II, Indianapolis, IN (US);
RCA Corporation, Princeton, NJ (US);
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.