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Amplitude Modulation

Audio/Video Glossary - Amplitude ModulationAmplitude Modulation, AM, is used when a signal, (usually an RF* signal) is transmitted carrying low frequency information. The low frequency signal modulates -(changes) the amplitude of the RF signal, and is recovered (detected) at the receiver's end. Video information that is transmitted on the air as TV transmission employs this system. Some radio stations use it also (AM Broadcast), although the superior FM* system dominates radio transmissions.