amplitude modulation

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amplitude modulation

n. Abbr. AM
1. The encoding of a carrier wave by varying its amplitude in accordance with an input signal.
2. A broadcast system that uses amplitude modulation.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

amplitude modulation

1. (Telecommunications) 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. Abbreviation: AM or am Compare frequency modulation
2. (Telecommunications) a wave that has undergone this process
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(æm; unstressed əm, m)

1st pers. sing. pres. indic. of be.
[before 900; Old English am, eam, eom]


1. Asian male.
2. amplitude modulation: a method of impressing a signal on a radio carrier wave by varying its amplitude.
3. a system of broadcasting using this method.
Compare FM.


Chem. Symbol.


1. America.
2. American.


Master of Arts.
[< Latin Artium Magister]


or A.M.,

1. before noon.
2. the period from midnight to noon, esp. the period of daylight prior to noon.
Compare p.m.
[1755–65; < Latin ante merīdiem]
usage: The abbreviation a.m. refers to the period from midnight until noon. One minute before noon is 11:59 a.m. One minute after noon is 12:01 p.m. Many people distinguish between noon and midnight by saying 12 noon and 12 midnight. Expressions such as 6 a.m. in the morning and 9 p.m. at night are redundant.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

amplitude modulation

A method of radio broadcasting in which the amplitude of the wave that carries the sound signal changes to reflect the various sounds that are to be reproduced, while the frequency of the wave remains the same. Compare frequency modulation.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.amplitude modulation - modulation of the amplitude of the (radio) carrier waveamplitude modulation - modulation of the amplitude of the (radio) carrier wave
modulation - (electronics) the transmission of a signal by using it to vary a carrier wave; changing the carrier's amplitude or frequency or phase
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
modulation d'amplitude
References in classic literature ?
I would come with you, but sooth to say I am stationed here and may not move.
Robredo discussed the issue on Sunday with Ely Saludar, her co-anchor in 'BISErbisyong LENI,' her weekly program aired over AM station DZXL.
A student from the Far Eastern University Department of Communication won Best Male Anchor as Radio Veritas 846, the nation's leading faith-based AM station, recognized schools and students' excellence in radio broadcasting in their youth-oriented weekly program Campus Hour Season 9 last June 1 at Centro Escolar University-Malolos in Bulacan.
In the radio category, on the other hand, UPLB gave the Gandingan ng Agham at Teknolohiya award to Mang Tani Cruz for "IM Ready Sa Dobol B", which respectively won Most Development-Oriented Science and Technology Program, that airs on GMA's flagship AM station Super Radyo DZBB.
Ras Al Khaimah: Rajeev Cherai, 49, a popular Indian radio presenter with a Ras Al Khaimah-based Malayalam AM station, passed away in his hometown in the South Indian state of Kerala on Friday.
AM station equipment is old and some were blown off by thunderstorms recently.
When I was a kid, by some miracle of the Shenandoah airwaves, my father was able to tune his Panasonic radio to the AM station out of Boston, which we listened to while muting the television in our playroom.
Before All Comedy Radio 1450 went on the air in 2012, the station served as an AM simulcast for Mielke's KKNX 840 AM station, which plays oldies at 840 AM.
The radio had an on/off dial and five AM station presets.
The 5,000-watt AM station will, but "we didn't put it in to try to compete with Little Rock," he said.
Hemming used to host the breakfast show on Sheffield's Magic AM station, Nottingham crown court heard.