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FM (FrequencyDefinition: A value, expressed in Hertz, that indicates how many cycles of a periodic signal occur in one second. ModulationDefinition: The process of one signal influencing a different signal, in real time. This can occur with radio frequencies (e.g., using audio to modulate a radio frequency carrier signal), audio frequencies (see: FM Synthesis and Ring Modulation), or sub-audio signals (see: LFO).): A method of transmitting audio with minimal noise. The waveformDefinition: A graphic picture of a wave. being modulated is called the carrierDefinition: A waveform that is modulated by another waveform, as used in radio/TV broadcasting, FM synthesis, and ring modulation. and the modulating waveform, the modulatorDefinition: 1. (general) A circuit of software routing that influences one signal with another. 2. (radio) A device or software routine that converts audio and/or video signals to AM, FM, and/or digital signals. See: AM and FM. 3. (cable TV systems) Up-converting video, audio or internet IP data to cable modems..