A control signal generator (60) is responsive to the output of a pair of correlation indicators (40, 50). One correlation indicator (40) provides an indication of the presence or absence of correlation between high frequency components derived without difference in delay from the respective luminance and chrominance outputs of a composit color signal comb filter system (11, 3, 15, 19, 21, 27, 17). The other correlation indicator (50) provides an indication of the presence or absence of correlation between high frequency components derived with a difference in delay (52) from the respective comb filter outputs, the delay difference corresponding to a quarter period at the nominal color subcarrier frequency. A control signal (SC) is developed in response to a correlation indication by either or both of the indicators. The luminance output of the comb filter, subjected to high frequency component removal (31) is selected (B, 25) during control signal development. 
HANGING DOT REDUCTION SYSTEM