Discussion
Why can a limiter be used in FM but not in AM?
Answer: D
Because an FM signal's amplitude is constant by design, clipping it discards noise without discarding information, whereas an AM signal's amplitude is the message and a limiter would destroy it. That single asymmetry is the origin of most of FM's noise advantage. Peak-to-average ratio, bandwidth and detector linearity are all real differences between the schemes but none of them decides whether limiting is permissible. Every noise-reduction technique exploits an asymmetry between signal and noise, and here the asymmetry is that one is constant in amplitude and the other is not.
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