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Communication System — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsCommunication System2 Marks
Question
Explain frequency modulation.
✓

Answer

Kinds of modulation: The sinusoidal carrier wave can be expressed as: $e_c= E _c \sin \left(w_c t+\theta\right)$.
The three distinct characteristics of this wave are :
(i) Amplitude (Ec), (ii) Angular frequency $\left(\omega_c\right)$ and (iii) Phase angle $(\phi)$.
Either of these three characteristics can be varied in accordance with audio signal i.e. base band signal. Hence accordingly there are three possible types of modulation as given below :
(1) Amplitude Modulation (A.M.)
(2) Frequency Modulation (F.M.)
(3) Phase Modulation (P.M.)

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