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APC detection by the PLL detector shown in Fig. 1 is accomplished by multiplying the IF signal and the VCO signal by the phase difference #/2, generating the VCO control voltage. Multiplying by the phase difference #/2 makes it possible to suppress the AM component; in addition, because VCO is controlled through a low-pass filter (L.P.F), a carrier signal with a good C/N is obtained. As a result, by using the PLL detection system, the improved characteristics (1) through (4) listed above become possible. However, because television broadcasts are transmitted using the vestigial sideband system, simply using the PLL detection system will create the following problems in regard to the audio characteristics. The RF signal that is input from the antenna is converted to an IF signal by the tuner, and a Nyquist strobe generated by a SAW filter is passed through the corresponding vestigial sideband . At this point, because the sideband in the region of the picture carrier is eliminated as shown in Fig. 2, the vector amounts of the upper sideband and the lower sideband differ, generating a phase distortion (e) in the composite vector amount.