Apparatus for separating luminance and chrominance signals and the method thereof

Disclosed are an apparatus for separating a composite video signal into luminance and chrominance signals and the method thereof. There is provided a chrominance signal separating circuit which comprises: a narrow band pass filter and a wide band pass filter for receiving a primarily comb-filtered composite video signals, respectively; two level detectors for detecting a degree of color change which is a difference between chrominance signals outputted from the band pass filters, respectively, and an amplitude of the chrominance signal outputted from the wide band pass filter, respectively; two coefficient generators for generating respective coefficients corresponding to the values detected from the level detectors; and two multipliers and an adder, for processing respective predetermined interval delayed signals, i.e., the delayed transition chrominance signal and a delayed output signal of the narrow band pass filter, and the coefficients outputted from the coefficient generators. Accordingly, the comb-filtered composite video signal is filtered by changing the bandwidth according to an amplitude of chrominance signal and a degree of color change, thereby minimizing the obstacle factors causing deterioration of the picture quality so as to provide an improved picture.