Q.

A narrow band noise can exist in

A. am only
B. pcm only
C. fm only
D. am and fm both
Answer» D. am and fm both
Explanation: narrow band filter is used to isolate a narrow band of frequencies from a wider bandwidth signal. it is a combination of band pass and band reject filter. so it can be used in both am and fm to pass a band of frequencies or to attenuate a band of frequencies.
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