WIRELESS MICROPHONE RECEIVING DEVICE HAVING MUTE CONTROL FUNCTION

摘要

PURPOSE: A wireless microphone receiving device having a mute control function is provided to release a mute in case that a tone signal is successively inputted and cancel a short-type noise and an impulse-type noise by a temporal external interference radio wave which exists in a frequency range identical to the tone signal. CONSTITUTION: A tone signal separator(301) separates only a tone signal from a voice signal and the tone signal inputted from a frequency demodulating unit by an LC resonance, and outputs the tone signal. A tone decoder(302) outputs a reset control signal according to the tone signal inputted from the tone signal separator(301). A mute signal control unit(310) is reset according to the reset control signal of the tone decoder(302). The mute signal control unit(310) controls a mute time to delay a setup time and release a mute when a successive tone signal is inputted. An FM IF(Intermediate Frequency) IC(153) outputs a high signal or a low signal according to the output signal of the tone decoder(302). A control signal output unit(304) performs the NAND operation of output signals of the mute signal control unit(310) and the FM IF IC(153), and outputs a mute control signal to a CPU.