Discussion
Vestigial sideband is used for television video because
Answer: C
Video content extends almost to direct current, so a filter sharp enough to remove one sideband cleanly would destroy the low-frequency content that carries the picture's large-area brightness. Leaving a vestige of the unwanted sideband solves it while still saving most of the bandwidth. Power saving is incidental. Colour is carried on a subcarrier within the same channel. And envelope detection of SSB is poor, but the driving reason here is the spectral shape of the message.
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