ACOUSTIC NOISE MEASUREMENTS UNDER FREE-FIELD CONDITIONS.

Abstract

There is an increasing requirement by the field forces for new power source systems which operate silently. A method is described for the determination of equipment acoustic noise by octave-band analysis under free-field conditions. A procedure based on critical band theory is discussed for the establishment of masked threshold criteria to evaluate equipment sound pressure levels (SPL). Preferred octave-band spectra are given in terms of 20-foot sound pressure levels which correspond to the 'just audible' noise for listeners at 50 and 100 feet for a jungle environment. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1969
Accession Number
AD0691107

Entities

People

  • Guido E. Guazzoni
  • Stuart J. Shapiro

Organizations

  • United States Army Communications-Electronics Command

Tags

DTIC Thesaurus Topics

  • Band Spectra
  • Band Structures
  • Band Theory Of Solids
  • Energy Bands
  • Environment
  • Field Conditions
  • Free Field
  • Human Factors Engineering
  • Measurement
  • Pressure Measurement
  • Sound Pressure
  • Spectra

Fields of Study

  • Physics

Readers

  • Auditory Neuroscience/Auditory Physiology.
  • Electrical Engineering
  • Geotechnical Engineering.