Interval Modulation (IM) of a Sinusoidal Carrier.

Abstract

Interval Modulation (IM) of a sinusoidal carrier is a modulation technique unlike AM, FM, or PM. IM conveys the information of a message waveform by modulating an interval between bursts of a sinusoidal carrier. IM is accomplished by sampling the message waveform, producing a delay proportional to the amplitude of the sampled message waveform and, upon the completion of the delay, initiating a burst of a fixed number of full cycles of a sinusoidal carrier. With the completion of the burst, another sample of the message waveform is taken and the sequence of events repeats. Because the length of a burst is fixed and because the delay between bursts is dependent upon the sampled value of the message waveform, the IM signal is non-periodic. An analysis is made of the IM signal modulated by a constant voltage modulating waveform and by general modulating waveforms. Descriptions are given for the circuits used in generation and detection of the IM signal. IM signal parameters are also considered for use with message waveforms in the audio frequency range. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1977
Accession Number
ADA039512

Entities

People

  • Edgar Leslie Kilborn Jr
  • Glen A. Myers

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Audio Amplifiers
  • Audio Frequency
  • Carrier Frequencies
  • Communication Systems
  • Demodulation
  • Detectors
  • Electrical Engineering
  • Frequency
  • Generators
  • Intervals
  • Modulation
  • Modulators
  • Sine Waves
  • Spectra
  • Spectral Lines
  • Timing Circuits
  • Waveforms

Readers

  • Approximation Theory.
  • Radio communications and signal processing.