Hue correction circuit for a digital tv receiver

Details Hue correction circuit for a digital tv receiver Hue correction circuit for a digital tv receiver

H - Electricity

04

N

350/59

H04N 9/68 (2006.01) H04N 9/45 (2006.01) H04N 9/64 (2006.01)

Patent

CA 1216660

Abstract of the Disclosure A digital hue correction circuit for correcting the color of digital TV chrominance signals includes means for dividing the smaller of the magnitudes of first and second color mixture signals by the larger of the magnitudes of the first and second signals to produce quotients representing tangents over the range of zero to 45 degrees. The polarity of the first and second signals are applied to means for transposing the zero to 45 degree angle tangent values over the range of at least zero to 90 degree angles. The transposed tangent values are applied to means for generating hue correction coefficients representing the sines and cosines of angles by which the chrominance vector is to be rotated to effect hue correction. The first and second signals and the hue correction coefficients are applied to a multiplier and combiner to produce corrected color mixture signals I' and Q' according to the equations I' = I cos .DELTA..PHI. ? Q sin .DELTA..PHI. Q' = Q cos .DELTA..PHI. ? I sin .DELTA..PHI.. where: I is the first color mixture signed, and Q is the second color mixture signed.

467485

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