Q. 243.7( 3 Votes )

(a) If A and B re

Answer :

(a)


Given,


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




(b)


We have,



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


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