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Consider the following statements about delta modulation.

1. It transmits one bit per sample

2. It needs a much higher sampling rate than pulse code modulation

3. Its step size must satisfy two opposing requirements

Which of the statements given above is or are correct?

  • A.1 and 2 only
  • B.2 and 3 only
  • C.1 and 3 only
  • D.1, 2 and 3

Answer: D

All three are correct. One bit per sample is the definition, the high rate is the price of that simplicity, and the step size is caught between slope overload if it is too small and granular noise if it is too large. A parameter bracketed by two opposing failures always has an optimum rather than a direction of improvement, and adaptive step sizing is the engineering answer to it.

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