Question

A modulating signal is a square wave as shown in the figure .The carrier wave is given by $c\left(t\right)=2Sin\left(8\pi t\right)$ volts.The Modulation index is

• A. 2
• B. 0.75
• C. 0.5
• D. 1.5

Answer 1

The correct option is C 0.5

From the carrier wave equation we have $A_c=2$ and from the graph we have $A_m=1$.
Thus we get modulation index as $\frac{A_m}{A_c}=\frac{1}{2}=0.5$