http://encyclopedia2.thefreedictionary.com/Amplitude+Modulation Amplitude modulation Varying the voltage of a carrier or a direct current in order to transmit analog or digital data. Amplitude modulation (AM) is the oldest method of transmitting human voice electronically. In an analog telephone conversation, the voice waves on both sides are modulating the voltage of the direct current loop connected to them by the telephone company. Modulate a Carrier Amplitude modulation (AM) is also widely used to alter a carrier wave ...
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