Question

A modulating signal is a square wave, as shown in the figure.
The carrier wave is given by $c\left(t\right)=2\sin \left(8\pi t\right)$
(i) Sketch the amplitude modulated waveform.
(ii) What is the modulation index?

Answer 1

(a)

$y\left(t\right)=[A_c+m(t\left)\right]c\left(t\right)$

where

$A_c$ is the amplitude of the carrier wave.

The modulated waveform $y\left(t\right)$ is shown in the figure.

(b)

Modulation index, $\mu =M/A=0.5$