I-phase fleshtone correction system using R-Y, G-Y and B-Y color difference signal demodulators

Claim 1

In a system for processing a video signal having a chrominance component containing color modulation information and a subcarrier burst reference component, apparatus for fleshtone correction and for demodulating said chrominance component comprising means responsive to said burst component for developing a subcarrier having a phase along an I-phase demodulation axis, about which axis are chrominance signal components containing fleshtone information; and automatic fleshtone control means, responsive to said I-phase subcarrier signal and to said chrominance component, for providing an output phase controlled flesh tone corrected I-phase subcarrier signal having a phase related to image fleshtone phase when the phase of said chrominance component is within a range of phases corresponding to a nominal range of fleshtone phase; wherein to maintain the quality of chrominance components containing fleshtone information by reducing the likelihood of introducing AC amplitude errors and DC offset errors of the type subject to being produced by an I-phase demodulator system with an associated matrix circuit, the improvement comprising: means for translating said phase controlled fleshtone corrected I-phase subcarrier output signal from said control means to produce plural subcarrier signals with phases respectively related to R-Y, G-Y and B-Y color difference signal phases; and plural signal demodulators each having a signal input for receiving said chrominance component to be demodulated, and a control input for receiving respective ones of said R-Y, G-Y and B-Y phase subcarrier signals for directly producing output demodulated R-Y, G-Y and B-Y color image difference signals.