Discussion
Why does an FM receiver mute below a threshold signal level?
Answer: D
Because of the threshold effect, the output collapses into noise below a certain input level, so muting spares the listener. It is the same reasoning as squelch in a two-way radio. The limiter draws no more current on weak signals. Nothing is damaged. And while a stereo decoder does need a usable pilot, mono muting operates regardless. Muting is a response to a sharp performance cliff rather than a protective measure. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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