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In frequency modulation, the amplitude of modulated carrier signal is ______and its frequency is ______ by the modulating message signal.

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In frequency modulation, the amplitude of modulated carrier signal is ______and its frequency is ______ by the modulating message signal.

(a) Constant, constant

(b) Varied, constant

(c) Constant, varied

(d) Varied, varied

I got this question in examination.

This is a very interesting question from Frequency Modulation Vs. Amplitude Modulation topic in chapter Modulation Techniques for Mobile Radio of Wireless/Mobile

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Correct choice is (c) Constant, varied

To explain: In frequency modulation (FM), the amplitude of modulated carrier signal is kept constant while its frequency is varied by the modulating message signal. FM is the most popular analog modulation technique used in mobile communication.

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