Q. 243.7( 3 Votes )

(a) If A and B re

Answer :



Maximum amplitude,
Minimum amplitude,

Let the amplitude of the message signal be and the carrier wave be .

Now, we know that

Adding (1) and (2), we get

Subtracting (2) from (1), we get

The modulation index is given by


We have,

The modulation index is kept less than unity to avoid distortion of the signal.

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