Discussion
What is delta modulation?
Answer: B
Delta modulation sends a single bit per sample saying whether the signal has risen or fallen since the last one, which makes the coder and decoder extremely simple at the cost of a much higher sampling rate. It has nothing to do with differences between channels, second derivatives or sample reordering. Trading sample rate for word length is the whole idea, and it is worth taking whenever simplicity matters more than efficiency. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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