Discussion
Assertion (A): Assertion: Pulse width modulation has better noise immunity than pulse amplitude modulation.
Reason (R): Reason: Its pulse amplitude is constant, so the receiver may limit the pulses.
Select the correct answer from the options below.
Answer: B
Both hold and the second explains the first: because amplitude carries nothing, clipping the pulses to a standard height discards amplitude noise without losing information. It is exactly the argument that gives frequency modulation its advantage over amplitude modulation, applied to a pulse train instead of a carrier. The same asymmetry between signal and noise is being exploited in both cases.
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