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A narrow band noise can exist in _________

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A narrow band noise can exist in _________

(a) AM only

(b) PCM only

(c) FM only

(d) AM and FM both

The question was posed to me during an interview.

Enquiry is from Generation of DSBSC Waves topic in chapter Double Sideband Suppressed Carrier Modulation of Analog Communications

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Correct choice is (d) AM and FM both

To explain: 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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