frequency modulation (FM)
Form of radio
transmission. It is the variation of the frequency
of a transmitted radio carrier wave by the signal being broadcast. The technique makes radio reception fairly free from static interference and, although restricted in range to receivers in line-of-sight of the transmitter, has become the most favoured transmission method. See also amplitude modulation (AM)
the modulation of a radio or other wave by variation of its frequency, esp. to carry an audio signal. Often contrasted with amplitude modulation.
the system of radio transmission using such modulation.
an FM radio station.
• Physics, symbol for femtometre(s)