Question

A modulating signal is a square wave, as shown in Figure.

The carrier wave is given by c(t) = 2sin(8πt) volts. Sketch the amplitude modulated waveform.

Answer 1

Here, c(t) = 2 sin8πt
It follows that the carrier is a sine wave having a period of T = 2π/8π = 0.25 s and
amplitude of E_C = ±2V
On the other hand, the modulating signal is a square wave of period 1 s and amplitude of E = ±1V.
Therefore, the maximum and minimum amplitude of the modulated waveform will be

Hence the amplitude modulated waveform will be as