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)
fre·quen·cy mod·u·la·tion (abbr.: FM) • n. 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.
FM or f.m. Abbrev. for frequency modulation. See modulation.
FM Abbreviation of frequency modulation
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