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Definition of Modulation Index of Amplitude Modulation The modulation index, also known as the modulation factor, is a measure of the extent to which the amplitude of a carrier signal is varied in accordance with a modulating signal in a modulation system. Recalling the definition of the amplitude modulation s_{HF}(t) = (A + \gamma s(t)) \cos(\omega_{c}t), the modulation index is defined as: \(\displaystyle m = \frac{\max|\gamma s(t)
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