phase modulation

WordReference Random House Unabridged Dictionary of American English © 2025

phase′ modula′tion, [Electronics.]

1. Electronics, Electronics radio transmission in which the carrier wave is modulated by changing its phase to transmit the amplitude and pitch of the signal.

• 1925–30

Collins Concise English Dictionary © HarperCollins Publishers::

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