Discussion
Why does pulse code modulation need more bandwidth than pulse amplitude modulation?
Answer: C
Coding replaces one amplitude sample with a group of bits, multiplying the pulse rate by the word length, and bandwidth follows the pulse rate. The sampling rate is the same for both, and amplitude is irrelevant to bandwidth. Guard bands belong to frequency division multiplexing. Coding buys noise immunity and regeneration by spending bandwidth, which is the same trade wideband FM makes by other means.
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