- Abbreviation of radio frequency modulation. The process of modifying a characteristic of an RF 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 modulation (2), or carrier modulation.
- synonymradio-frequency modulation