phase-modulation

phase modulation

noun Electronics.
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

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World English Dictionary
phase modulation
 
n
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

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American Heritage
Science Dictionary
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.
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