Discussion
What does the envelope of a DSB-SC signal look like for a tone message?
Answer: B
It looks like the rectified tone, so the envelope repeats at twice the message frequency while the carrier phase reverses at each null. That is precisely why an envelope detector fails and why the phase reversal must be tracked by a coherent receiver. The tone itself appears as the envelope only when a large carrier is present. Constant amplitude describes angle modulation. And a square wave would require a square-wave message.
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