Question

A carrier wave of peak voltage 12 V is used to transmit a message signal . What should be the peak voltage of the modulating signal in order to have a modulation index of 75% ?

Answer 1

Given , Peak voltage `V_(0) = 12 V`
Modulation index `mu = 75% = (75)/(100)`
We know that Modulation index `(mu) = ("Peak voltage of modulating signal" (V_(m)))/("Peak voltage"(V_(0)))`
So , peak voltage of modulating signal `V_(m) = mu xx` Peak voltage `= (75)/(100) xx 12 = 9 V`.