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Amplitude Modulation

This term refers to any periodic change in the amplitude (volume) of a signal. When the modulating signal is in the audible range (above 20Hz), amplitude modulation can produce additional harmonics, somewhat like those produced by FM (frequency modulation). More often, the frequency of the modulating signal is below the audible range and with a sine or triangle wave, this produces the effect more commonly referred to as tremolo.

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