Amplitude and Frequency Modulation for Facsimile Transmission and Other Applications

Abstract

The bandwidth required for the transmission of intelligence by f-m waves is found to be as great or greater than that required by a-m transmission. The spacing of radio-frequency channels, however, is normally not a function of intelligence bandwidth, but is dependent on the rate at which the side band amplitudes decrease outside this band. When modulating functions with discontinuities are employed, the channel spacing required by frequency modulation may be less than that required by a amplitude modulation.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1947
Accession Number
AD1204337

Entities

People

  • A. D. Watt

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Amplitude
  • Amplitude Modulation
  • Bandwidth
  • Channel Spacing
  • Discontinuities
  • Frequency
  • Frequency Modulation
  • Modulation
  • Radio Frequency

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Radio communications and signal processing.

Technology Areas

  • Space