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The difference between phase and frequency modulation ________

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The difference between phase and frequency modulation ________

(a) lies in the poorer radio response of phase modulation index

(b) lies in the different definition of modulation index

(c) is too great to make the two systems compatible

(d) is purely theoretical

This question was addressed to me in class test.

My question is taken from Superhetrodyne Receiver in division Receivers & Transducers of Analog Communications

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Right option is (b) lies in the different definition of modulation index

Easiest explanation: It is the difference in definition of modulation index and also the general expression of the modulated wave that makes it different between phase and frequency modulated systems.

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