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Definition of "Frequency Modulation" |
[FM] A signaling method that varies the carrier frequency in proportion to the amplitude of the modulating signal. Angle modulation in which the modulating signal causes the carrier frequency to vary. The amplitude of the modulating signal determines how far the frequency changes, and the frequency of the modulating signal determines how fast the frequency changes. Modulation in which the instantaneous frequency of a sine wave carrier is caused to depart from the center frequency by an amount proportional to the instantaneous value of the modulating signal. / Frequency modulation is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. Compare with amplitude modulation, in which the amplitude of the carrier wave varies, while the frequency remains constant. / The modulation of a radio or other wave by variation of its frequency, especially to carry an audio signal. / Radio astronomy service is a subfield of astronomy that studies celestial objects at radio frequencies. The initial detection of radio waves from an astronomical object was made in the 1930s, when Karl Jansky observed radiation coming from the Milky Way. |
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