modulation
  • The process of modifying a characteristic of a wave or signal proportionally to a characteristic present in another wave or signal. Also, the result of such a process. Usually utilized to convey meaningful information.
  • The process of modifying a characteristic of a carrier wave by an information-bearing signal, as occurs, for instance, in AM, FM, or PM. Also, the result of such modulation. For example, in FM, the instantaneous frequency of a sine wave carrier is varied above and below the center frequency by an information-bearing, or modulating, signal. Also called carrier modulation, or RF modulation.

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