Thomas J Bolger

US Patent:

45232210, Jun 11, 1985

Filed:

Jun 7, 1983

Appl. No.:

6/501908

Inventors:

Danny Chin - Plainsboro NJ
Eric P. Batterman - North Brunswick NJ
Thomas V. Bolger - Merchantville NJ

Assignee:

RCA Corporation - Princeton NJ

International Classification:

H04N 9535

US Classification:

358 21R

Abstract:

A color TV receiver designed to digitally process I and Q color mixture signals incorporates chroma gain control, static tint control and autoflesh in the circuitry for converting the I and Q signals to (R-Y), (B-Y) and (G-Y) for R,G,B matrixing. The magnitude and angle of the vector sum of I and Q are first determined. The angles are then adjusted for static tint control and then applied to a ROM which is programmed to output angles adjusted for fleshtones. Angles from the autoflesh ROM are applied to a summing circuit which algebraically adds to the flesh corrected angle, angle values corresponding to the angular displacement between the I axes and the (R-Y), (B-Y) and (G-Y) axes. The angles produced by the summing circuit are applied to a look-up ROM which produces the cosine values of the applied angles. The magnitude signal is amplified by coefficients which relate the I and Q signals to (R-Y), (B-Y) and (G-Y) components and which coefficients may be amplified by a chroma gain signal.