PURPOSE: To reduce the number of components by the constitution that a connecting path is provided between a circuit element forming a reception circuit and a gate control means whose output is an output of a noise blanker so as to omit a gate circuit interrupting a major path.

CONSTITUTION: A gate G2 of an intermediate frequency amplifier and a terminal 5c are connected so as to use the terminal 5c as an input side connecting point of a circuit to be controlled of the noise blanker so as to be connected through the X-X' connecting path, then a switching transistor (TR) Q1 of a gate control circuit 14 is turned off normally and no effect is given onto the intermediate frequency amplifier. If an ignition noise is superimposed on an input signal f1, a blanking pulse is outputted to a base of the switching TRQ1 of a gate control circuit 14 from a noise detector 13. The switching TRQ1 is activated in response to the blanking pulse so as to eliminate a pulse noise superposed on the input signal f1.