Question

For a modulation index much less than 1, the FM signal is considered as

• A. Narrow band VSB
• B. Narrow band FM
• C. Wideband AM
• D. Wideband FM

Hint:

In FM modulation, when the modulation index is small (\(\beta<1\)), the signal is classified as narrow band FM, and its bandwidth is constrained.

Answer 1

The Correct Option is B

For a modulation index (\(\beta\)) much less than 1, the FM signal is considered to be narrow band FM. In this case, the frequency deviation is small compared to the modulating frequency, and the bandwidth is much narrower than that of a wideband FM signal.