Abstract: A composite color video signal including a luminance signal and a carrier chrominance signal multiplexed with the luminance signal is separated by a signal separating circuit to the luminance signal and the carrier chrominance signal. The luminance signal is clipped by a clipping circuit at levels approximating to its black and white peak levels and an output signal of the clipping circuit is shaped to control pulses corresponding to level transitions of the output signal by a wave shaping circuit. A signal attenuating circuit for attenuating the carrier chrominance signals or demodulated color signals in response to color pulses applied thereto is connected in a signal transmission path for receiving the carrier chrominance signal from the signal separating circuit to thereby reduce cross-color and color-fringing components caused at level transitions of the luminance signal.

Abstract: A composite video signal is separated into luminance signal component and carrier chrominance signal component by means of a signal separation circuit using a comb filter. The carrier chrominance signal component is multiplexed in frequency-interleaved relation with the luminance signal component, and formed by quadrature modulation of a color subcarrier with a wideband I signal and a narrowband Q signal. A line correlation detector for detecting the correlation between video signals on adjacent horizontal scanning lines is connected with both outputs of the signal separation circuit. The detector detects the absence of line correlation when color subcarrier frequency appears simultaneously at both outputs of the signal separation circuit. The I signal is demodulated in wideband when the line correlation exists and in narrowband when no line correlation exists.