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Communication SystemsPulse Modulation

In pulse-amplitude modulation (PAM), which pulse parameter varies with the message signal?

  • AAmplitude
  • BWidth only
  • CPosition only
  • DCarrier phase only
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Correct Answer: A. Amplitude
Explanation: In PAM, the amplitudes of regularly spaced pulses vary according to sampled values of the message.
Reference: Standard communication systems: pulse modulation
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