R

Rakesh Kumar • 28.44K Points
Instructor II 

Q. Frequency modulated signal is regarded as the phase modulated signal in which the modulating wave is differentiated before modulation.

(A) true
(B) false
(C) ---
(D) ---
Correct : Option (B)

Explanation: 
 frequency modulated signal is regarded as the phase modulated signal in which the modulating wave is integrated before modulation. this means that an fm signal can be generated by first integrating the message signal and then using the result as an input to a phase modulator.

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