Discussion
A delta modulated link reproduces quiet passages cleanly but distorts loud, high-pitched sounds. Which explanation fits?
Answer: B
Loud and high-pitched together means steep, so the input's slope is exceeding the step size times the clock rate. Granular noise is the opposite failure and shows up on quiet or steady passages. Aliasing would produce spurious tones rather than distortion tracking loudness and pitch. And bit errors would not correlate with the signal at all. The two delta modulator defects can be told apart purely by which passages they spoil, which is why the symptom description is enough to name the cure.
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