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Meaning of pulse-amplitude modulation

pulse'-am'pli•tude modula"tion

Pronunciation: (puls'am'pli-td", -tyd"), [key]
— Telecommunications. Telecommunications.
  1. modulation of the amplitude of a train of electric pulses used to carry signalsAbbr.: PAM
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.