Discussion
Synchronous detection of AM requires
Answer: B
Coherent detection multiplies by a locally generated carrier matched in frequency and phase, and errors in either degrade or destroy the output. It is mandatory for suppressed-carrier signals and gives a small noise advantage for full-carrier AM, but the extra complexity is why envelope detection dominates broadcasting. A diode characteristic is an envelope-detector matter. A limiter belongs to FM. And it is envelope detection that needs no reference.
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