Discussion
Vestigial sideband is used for television video because
Answer: C
Video content reaches down towards direct current, so a filter sharp enough to remove one sideband cleanly without damaging the low-frequency components cannot be built; leaving a vestige of the unwanted sideband solves it. Power saving is a secondary benefit. Envelope detection of SSB is indeed poor, but the driving reason here is the spectral shape of the message. And the carrier is retained precisely so that a simple envelope detector can be used in the receiver.
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