Discussion
Consider the following pairs of scheme and its distinguishing requirement.
DSB-SC - Coherent detection
SSB - Accurate carrier reinsertion
Full-carrier AM - Envelope detection suffices
Vestigial sideband - Coherent detection essential
How many of the pairs given above are correctly matched?
Answer: D
The first three are right and the fourth is not, so three match. Vestigial sideband retains its carrier precisely so that envelope detection works, which is what made television receivers cheap. The pattern across the four is worth holding: keep the carrier and the receiver is simple, remove it and the receiver must supply a reference, and the bandwidth saving is a separate axis governed by how many sidebands are sent.
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