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Understanding Amplitude Modulation Basics is a document available to read on EtoBox.

Amplitude modulation (AM) is a process where the amplitude of a carrier wave is varied in proportion to the instantaneous amplitude of the modulating signal. AM is used in commercial audio and video broadcasting and two-way mobile radio communications. In AM, the modulating signal shifts the carrier frequency to produce double sidebands. Demodulation requires multiplying the signal by a carrier wave of the same frequency and phase as the original carrier. Modulation index indicates the ratio of modulating s

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