/ Dictionary / Index P pulse-time modulation: Meaning and Definition of Find definitions for: pulse'-time modula"tion Pronunciation: (puls'tīm"), [key] — Electronics. Electronics. 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. pulse repetition frequency pulsimeter Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language