Question

For an amplitude modulated wave, the maximum amplitude is foundto be 10V while the minimum amplitude is found to be 2V. Determinethe modulation index, μ.

Answer 1

Given,

Maximum amplitude, A max =10 V

Minimum amplitude, A min =2 V

Let μ be the modulation index of the modulated wave.

The modulation index is,

μ= A max − A min A max − A min

Substitute the given values in above expression.

μ= 10−2 10+2 = 8 12 = 2 3 =0.67

If A min =0

Then,

μ= 10−0 10+0 =1