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Question 20229
JEE Physics · Hard

Principles of Communication: Digital Communication MCQ

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Digital CommunicationHardQuestion 20229

Question

Pulse Code Modulation (PCM) involves:
  1. A
    Varying pulse amplitude continuously
  2. B
    Sampling, quantizing, and encoding the signal into binary words
    Correct
  3. C
    Sending pulses at varying frequencies
  4. D
    Varying pulse width

Correct answer

Sampling, quantizing, and encoding the signal into binary words

Explanation

PCM steps: (1) Sampling at fs ≥ 2B (Nyquist); (2) Quantization into 2n levels; (3) Encoding each sample as n-bit binary word. This is the basis of all digital telephony and audio (CD: 44.1 kHz, 16-bit).

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