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Question 20304
JEE Physics · Hard

Principles of Communication: Digital Communication MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Digital CommunicationHardQuestion 20304

Question

Delta modulation (DM) is a simplified PCM where each sample is encoded as:
  1. A
    8 bits representing the absolute amplitude
  2. B
    1 bit representing the sign of the change from the previous sample
    Correct
  3. C
    4 bits representing amplitude difference
  4. D
    A variable-length codeword

Correct answer

1 bit representing the sign of the change from the previous sample

Explanation

Delta modulation: transmit 1 if signal went up, 0 if it went down relative to prediction. Very simple (1 bit/sample) but suffers from slope overload (can't follow fast changes) and granular noise (oscillates around flat segments). Adaptive DM (ADM) varies step size to address these problems.

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