radio transmission in which the carrier wave is modulated by changing its phase to transmit the amplitude and pitch of the signal.
Origin
1925-30
Examples from the web for phase modulation
The last section discusses phase modulation techniques that are enabled with continuous emitting light emitting diodes.
British Dictionary definitions for phase modulation
phase modulation
noun
1.
a type of modulation, used in communication systems, in which the phase of a radio carrier wave is varied by an amount proportional to the instantaneous amplitude of the modulating signal
phase modulation in Science
phase modulation 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.