PURPOSE: To attain accurate DC recovery for both FM transmission and AM transmission by implementing DC voltage recovery of a clamp circuit with the use of a clamp level signal for a vertical synchronizing signal period in the case of the FM transmission and with the use of this signal and a horizontal synchronizing signal in the case of the AM transmission.

CONSTITUTION: A MUSE signal inputted to an input terminal 21 is inputted to an A/D converter 25 via an amplifier 22, a capacitor 23 and an amplifier 24. Moreover, an output of the amplifier 22 is inputted to one terminal of a switch 28 via the capacitor 23 and a clamping resistor 27. The MUSE signal converted into a digital signal by an A/D converter 25 is inputted to a vertical synchronizing signal reference level detection DC potential setting circuit 31 and a horizontal synchronizing signal reference level detection circuit 32. An output of the circuit 32 is 0 when an FM transmission signal is received and a DC potential of the circuit 31 is fed to the switch 28. An output of the circuit 32 is a negative signal at AM transmission reception and an adder 30 adds outputs of the circuits 31,32 to give a DC potential to the switch 28 for the DC recovery.