Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1983-04-21
1985-11-19
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 9535
Patent
active
045545766
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.
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"Digivision" Development Data, Aug. 1982, ITT Intermetall Semiconductors, Freiburg, Germany.
Herrmann E. P.
Murray Richard
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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