Question

A carrier wave of peak voltage $12V$ 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: The peak voltage of the carrier wave is, $A_c=12V$

Modulation index, $m=0.75$

The peak voltage for the modulating signal is given by:

$m=\frac{A_m}{A_c}$.

$A_m=0.75\times 12$

So, $A_m=9V$