Discussion
What is granular noise in a delta modulator?
Answer: D
With a steady input the modulator alternates up and down by one step, producing an idling pattern heard as granular noise. The error on a rapidly changing input is slope overload, the opposite failure. Channel noise and filter distortion are external to the coder. The two defects pull the step size in opposite directions - larger to avoid overload, smaller to reduce granularity - which is precisely why adaptive step sizing was invented. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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