FM Radio
Frequency modulation for FM radio. (a) A carrier wave at the station's basic frequency. (b) An audio signal at much lower audible frequencies. (c) The frequency of the carrier is modulated by the audio signal without changing its amplitude.
Source
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"OpenStax College, College Physics. December 17, 2012."
http://cnx.org/content/m42444/latest/?collection=col11406/1.7
OpenStax CNX
CC BY 3.0.