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What is the full form of NBFM?

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What is the full form of NBFM?

(a) Narrow band frequency modulation

(b) National broadcast frequency modulation

(c) Near band frequency modulation

(d) Non broadcast frequency modulation

This question was addressed to me during an interview for a job.

My enquiry is from Non Linear Device topic in portion Side Band Techniques of Analog Communications

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The correct choice is (a) Narrow band frequency modulation

Explanation: NBFM stands for Narrow band frequency modulation. For NBFM, modulation index should be less than equal to 1.

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