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FM (Frequency Modulation)

FM (Frequency Modulation) Involves one frequency affecting another. FM can be applied as an effect or used as a form of synthesis (see below).

The frequency of an input or carrier sound is modulated by a second (modulator) sound. When the modulating frequency is low and the waveform is simple, such as a Sine WaveThe purest of sounds, looking like a sequence of hills and troughs, the sine wave (or sinusoid) creates the sound of a single frequency with no harmonics or interference.More infoSine Wave, the result is a vibrato. When the modulating frequency is higher, a more complex sound quality is generated.

This modulator usually sound has a frequency that is within the range of human hearing (20Hz – 20kHz). FM synthesis is able to easily create complex sound qualities.