The Effect of Helmet Form on Hearing: Free-Field Thresholds

Abstract

Audiometric threholds were determined for 12 subjects under three head conditions: bareheaded, while wearing an M1 helmet, and wearing an experimental helmet. The thresholds were measured for seven tones: 125, 250, 500, 1000, 2000, 4000 and 8000 Hz, at each of five angular orientations. Statistically noteworthy differences were studied for main effects and interactions. These appear to fall within the range of variation most people ordinarily experience on a day-to-day basis.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1972
Accession Number
AD0745121

Entities

People

  • Howard H. Holland
  • R. Bradley Randall

Organizations

  • Human Engineering Laboratory

Tags

Communities of Interest

  • Human Systems

DTIC Thesaurus Topics

  • Abstracts
  • Acoustic Absorption
  • Acoustic Propagation
  • Acoustics
  • Analysis Of Variance
  • Anechoic Chambers
  • Attenuation
  • Classification
  • Ear
  • Engineering
  • Free Field
  • Frequency
  • Human Factors Engineering
  • Losses
  • Orientation (Direction)
  • Standing Waves

Fields of Study

  • Psychology

Readers

  • Acoustics.
  • Educational Psychology
  • Military Engineering.