phase modulationphase modulation
nounAbbr. pm or p-m
(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.
phase modulation - Computer Definition
More commonly known as phase-shift keying (PSK). See PSK.
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.