Discussion
Why is differential pulse code modulation more efficient than plain coding?
Answer: B
Because consecutive samples are correlated, the difference between them is smaller than the samples themselves and needs fewer bits to describe to the same accuracy. The quantiser's level count is unchanged, anti-alias filtering is still mandatory, and the sampling rate must still satisfy Nyquist. Exploiting the redundancy a signal already contains is the cheapest possible saving, since it costs nothing but the arithmetic to predict the next sample.
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