Discussion
What does an adaptive delta modulator vary?
Answer: A
It varies the step size, enlarging it when the signal is changing fast and shrinking it when the signal is quiet, which addresses slope overload and granular noise together instead of compromising between them. The clock is fixed, there is no word length in a one-bit coder, and the sampling instants are regular. Where a fixed parameter is squeezed by two opposing requirements, making it adaptive is the natural resolution, and this is the textbook example.
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