AM Radio
Amplitude modulation for AM radio. (a) A carrier wave at the station's basic frequency. (b) An audio signal at much lower audible frequencies. (c) The amplitude of the carrier is modulated by the audio signal without changing its basic frequency.
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.