Discussion
A quadrature detector recovers FM by
Answer: C
The signal is multiplied by a copy of itself passed through a network giving ninety degrees at the centre frequency, so the product varies with frequency deviation. It uses one tuned circuit and integrates well, which made it common in television sound stages. Rectifying sidebands is not a detection method. A crystal comparison would give frequency error rather than the message. And the envelope of a limited signal is constant by construction.
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