squelch circuit

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Noun1.squelch circuit - an electric circuit that cuts off a receiver when the signal becomes weaker than the noise
circuit, electric circuit, electrical circuit - an electrical device that provides a path for electrical current to flow
References in periodicals archive ?
An optional squelch circuit silences the output if the signal fades to an unusable level.
Power saving features include voice-operated transmission (VOX), which disables the transmitter's output buffers; a pop-free squelch circuit, which mutes the receiver chip's audio amplifiers; and standby operation for each chip's second channel, providing mono operation.