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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.

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Solution

Given,

Maximum amplitude, A max =10V

Minimum amplitude, A min =2V

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= 102 10+2 = 8 12 = 2 3 =0.67

If A min =0

Then,

μ= 100 10+0 =1


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