An adaptive comb filter small in circuit scale and simple in circuit constitution is provided. The frequency band component of chrominance signal is extracted from a composite color video signal by a bandpass filter. The extracted chrominance signal is delay by a delay circuit by one horizontal period. A subtraction output is obtained by a first subtracting circuit between the output signal of the bandpass filter and the output signal of the delay circuit. An addition output is obtained by a adding circuit between the output signal of the bandpass filter and the output signal of the delay circuit. A correlation detecting circuit is provided that outputs a binary signal k0 based on a relationship between the output of the first subtracting circuit and the output of the adding circuit. This binary signal k0 and a signal k1 obtained by delaying this binary signal k0 by a second delay circuit by one horizontal period are supplied to an arithmetic block. From an operational result between the signals k0 and k1, the arithmetic block outputs a select signal for performing switching control on a selector switch circuit that switches between the output of the bandpass filter and the output of the first subtracting circuit and outputs the switched output. Then, the arithmetic block obtains the chrominance signal from the selector switch circuit.