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An FM signal is a ______ envelope signal.

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An FM signal is a ______ envelope signal.

(a) Varied

(b) Small

(c) Large

(d) Constant

I have been asked this question during an interview for a job.

Question is taken from Frequency Modulation Vs. Amplitude Modulation in section Modulation Techniques for Mobile Radio of Wireless/Mobile

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Best answer
The correct choice is (d) Constant

The best I can explain: An FM signal is a constant envelope signal. It is due to the fact that the envelope of the carrier does not change with changes in the modulating signal. Hence, the transmitted power of an FM signal is constant regardless of the amplitude of the message signal.

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