amplitude modulation

noun Electronics, Radio.

Origin:
1920–25

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Collins
World English Dictionary
amplitude modulation
 
n
1.  Compare frequency modulation AM, Abbreviation: am one of the principal methods of transmitting audio, visual, or other types of information using radio waves, the relevant signal being superimposed onto a radio-frequency carrier wave. The frequency of the carrier wave remains unchanged but its amplitude is varied in accordance with the amplitude of the input signal
2.  a wave that has undergone this process

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American Heritage
Science Dictionary
amplitude modulation  
A method of transmitting signals, such as sound or digital information, in which the value of the signal is given by the amplitude of a high frequency carrier wave. In AM radio transmission, for example, the signal to be carried is a sound wave, and its increasing and decreasing value is reflected in the increasing and decreasing amplitude of the radio frequency carrier wave. In fiber optics, the carrier wave is a beam of light. Compare frequency modulation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
amplitude modulation (AM)

A type of radio signal in which the amplitude, or strength, of a radio wave is varied in order to carry information from a transmitter to a receiver. (Compare frequency modulation (FM).)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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FOLDOC
Computing Dictionary

Amplitude Modulation definition

communications
(AM) A method of encoding data by varying the amplitude of a constant frequency carrier.
Contrast Frequency Modulation.
(2001-04-30)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
In amplitude modulation, the modulation factor expressed in percent.
AM is short for amplitude modulation, which refers to the means of encoding the audio signal on the carrier frequency.
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