Modulation
Definition: Modulation is the transfer of information to an electronic or optical signal. It can be applied to direct current, to altering current, and optical signals. Common modulation methods include, Amplitude Modulation (AM) in which the voltage applied to the signal is varied over time, Frequency Modulation (FM) in which the frequency of the carrier signal is transmitted in is varied in small but meaningful amounts and Phase Modulation (PM) in which the natural flow of the alternating current waveform is delayed temporarily.
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