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FM is a part of general class of modulation known as ______

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FM is a part of general class of modulation known as ______

(a) Angle modulation

(b) Phase modulation

(c) Amplitude modulation

(d) Frequency modulation

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This intriguing question comes from Angle modulation topic in section Modulation Techniques for Mobile Radio of Wireless/Mobile

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Correct choice is (a) Angle modulation

The best explanation: FM is a part of general class of modulation known as angle modulation. Angle modulation varies a sinusoidal carrier signal in such a way that the angle of the carrier is varied according to the amplitude of the modulating baseband signal.

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