WordNet (r) 3.0 (2006):
frequency modulation n 1: modulation of the frequency of the (radio) carrier wave [syn: frequency modulation, FM]The Free On-line Dictionary of Computing (30 December 2018):
Frequency Modulation(FM) A method of encoding data by varying the frequency of a constant amplitude carrier signal. Contrast Amplitude Modulation. (2001-04-02)