Radio variation in the phase of a carrier wave in accordance with some signal, as speech
phase modulation
phase modulationWebster's New World College Dictionary, Fifth Edition Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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phase modulation
noun
Abbr. pm or p-mA method of signal transmission in which the phase of a carrier wave is varied to transmit information contained in the signal.
THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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A method of transmitting signals in which the value of the signal is proportional to the phase angle of a carrier wave. It is often combined with amplitude modulation to transmit digital information via modems.
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Noun
(abbreviated as PM)
- A method of sending information by modifying (modulating) the difference in phase (fraction of a wave length) between a signal and a reference.
English Wiktionary. Available under CC-BY-SA license.
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phase modulation - Computer Definition
More commonly known as phase-shift keying (PSK). See PSK.
Webster's New World Telecom Dictionary Copyright © 2010 by Wiley Publishing, Inc., Indianapolis, Indiana.
Used by arrangement with John Wiley & Sons, Inc.
Used by arrangement with John Wiley & Sons, Inc.
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Phase modulation. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/phase-modulation
Varying the angle of a wave in a carrier in order to transmit analog or digital data. For digital signals, phase modulation (PM) is widely used in conjunction with amplitude modulation (AM). For example, quadrature amplitude modulation (QAM) uses both phase and amplitude modulation to create different binary states for transmission (see QAM). See modulation and carrier.
Vary the Angle
In PM modulation, the angle of the carrier wave is varied by the incoming signal. In this example, the modulating wave implies an analog signal.
Digital Phase Shift Keying (PSK)
For digital signals, phase shift keying (PSK) uses two phases for 0 and 1 as in this example. See DPSK.
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