To efficiently execute reception in a small scale by respectively converting the common-mode and orthogonal components of modulating signal carrier wave into baseband signals, detecting the phase difference and controlling a phase shift equipment for shifting the oscillation signal of a voltage control oscillator.

Received FM modulating signal carrier wave is distributed by a power splitter 114 and a one-channel signal processing part 100 converts its common-mode component into the FM baseband signal and a Q-ch signal processing part 102 converts the orthogonal component into the FM baseband signal. The output of a one-channel baseband signal amplifier 120 is inputted to a comparator 202 so as to be adopted as the trigger signal of an analog switch 204. In the meantime, the output of a Q-ch baseboard signal amplifier 128 is inputted to the analog switch 204, sampling is executed by the trigger signal, a high frequency component is removed by an integrating equipment 206 and impression is executed on a voltage control 90 phase shift equipment 208. An automatic phase control circuit 200 detects phase difference between one-channel and Q-channel and the control voltage of the voltage control 90° phase shift equipment 208 is generated.