Meaning of pulse-time modulation

pulse'-time modula"tion

Pronunciation: (puls'tīm"), [key]
— Electronics. Electronics.
  1. radio transmission in which the carrier is modulated to produce a series of pulses timed to transmit the amplitude and pitch of a signal. Abbr.: PTM
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.