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Question

Derive expression for amplitude modulated wave? What is meant by side band frequencies in carrier wave?

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Solution

The ratio between the amplitude change of carrier wave to the amplitude of the normal carrier wave is called Modulation index. It is represented by the letter 'm'. It can also be defined as the range in which the amplitude of the carrier wave is varied by the modulating signal

In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, containing power as a result of the modulation process. ... The sidebands consist of all the Fourier components of the modulated signal except the carrier.


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