Frequency modulation (FM) is a method of encoding information on a carrier wave by varying the instantaneous frequency of the wave
. In analog frequency modulation, the instantaneous frequency deviation of the carrier wave has a functional relation to the modulating signal amplitude
. FM is widely used in telecommunications, radio broadcasting, signal processing, and computing
. It is also used in telemetry, radar, seismic prospecting, and monitoring newborns for seizures via EEG, two-way radio systems, sound synthesis, magnetic tape-recording systems, and some video-transmission systems
. In FM radio broadcasting, frequency modulation is widely used because it has a larger signal-to-noise ratio than amplitude modulation
. Digital data can be encoded and transmitted with a type of frequency modulation known as frequency-shift keying (FSK)
