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Squelch circuit is normally inserted in receiver ________

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Squelch circuit is normally inserted in receiver ________

(a) after detector

(b) before detector

(c) before mixer

(d) after power amplifier

I got this question during an interview.

I'm obligated to ask this question of Linear Modulation topic in portion Amplitude Modulation of Analog Communications

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Correct answer is (a) after detector

For explanation I would say: Squelch is a circuit that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal. Squelch is added to suppress noise. It is added after detector when there is no carrier.

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