PURPOSE: To eliminate the pc component generated in detuning with simple constitution by providing a circuit which uses the DC signal outputted by an inverting amplifier to eliminate this nc component from the information signal outputted by a frequency conversion circuit.

CONSTITUTION: The frequency change of an inputted FM signal Si is converted into a voltage change by a frequency conversion circuit 11. This output voltage V1 is inputted to not only a DC component eliminating circuit 14 but also an LPF 12. The LPF 12 eliminates an AC component VAC from the voltage V1 and outputs an obtained output V2 to an inverting amplifier 13. This amplifier 13 inverts AV of the inputted voltage V2 and outputs an obtained output voltage V3 to the DC component eliminating circuit 14. In the circuit 14, currents I1 to I3 and I5 to I6 flow to resistor R1 to R6 by voltages V1 and V3. A current iAC of the current I3 (=iAC+ΔI) doesn t flow to the resistor R4, and a current I4 (=iAC) flows to an output terminal.