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Question:

The carrier wave is represented by C(t)=5sin(10πt) volt. A modulating signal is a square wave as shown. Determine modulation index.

Solution:

Modulation index = Amplitude of Modulating Signal / Amplitude of Carrier Wave
Here, amplitude of modulating signal, Am = 2V
Amplitude of carrier wave, Ac = 5V
∴μ = Am/Ac = 2/5 = 0.4