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The effect of this Nyquist buzz canceller circuit is to broadly suppress the buzz (fH harmonic ) generated as a sideband of the SIF beat signal (4.5 MHz). As a result, great improvements can be made in regard to the buzz beat generated during demodulation of Japan audio multiplexing (L-R) and the buzz characteristics during demodulation of U.S. MTS (Multichannel TV Sound) (L-R). Furthermore, because this Nyquist buzz cancellation method has no effect on the time constant of the PLL loop, it is also possible to try to improve various characteristics, by making it possible to, for example, design an APC filter that is not readily affected by flyback pulses (F.B.P), etc.