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:
Apr. 21, 1983
Yih-Sien Kao, Gaithersburg, MD (US);
RCA Corporation, Princeton, NJ (US);
Abstract
A digital TV receiver includes circuitry for performing hue control by rotation of the axes of the I and Q color mixture signals. The I and Q color mixture signals are time division multiplexed and applied to a multiplicand input port of a multiplier circuit. The sines and cosines of the angle by which the I and Q vectors are to be rotated are also applied to the multiplier wherein alternate pairs of the I and Q signals are multiplied by the sine terms and intervening pairs of the I and Q signals are multiplied by cosine terms. The signal from the multiplier is applied to a delay element which delays successive samples by one sample period. Delayed and nondelayed signal samples are applied to an ADDER which produces the algebraic sums Icos .phi.+Qsin .phi. and Qcos .phi.-Isin .phi. corresponding to the desired modified I and Q signals respectively. The sums from the ADDER are demultiplexed by latches to generate separate I and Q signals.