The Objective Measurement of the Attenuation of Hearing Protectors of the Circumaural Type.

Abstract

Measurements have been made of the attenuation of five circumaural hearing protectors using dummy heads of three different designs. Results illustrate the variability on repeated attachment of the protectors to the dummy heads, and the effect of geometrical factors in the design of the latter. The results are also compared with the subjective calibration of the same five earmuffs carried out previously under directly comparable conditions. Attenuation measured on the dummy heads was consistently greater than that found subjectively, but was highly correlated to it at frequencies up to 2 kHz. This correlation is used to demonstrate that results in good agreement with subjective values may be predictable from objective measurements in simple test conditions.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1978
Accession Number
ADA130308

Entities

People

  • D. W. Robinson
  • G. J. Sutton
  • L. S. Whittle

Organizations

  • National Physical Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Engineered Resilient Systems

DTIC Thesaurus Topics

  • Acoustics
  • Artificial Skin
  • Calibration
  • Free Field
  • Frequency
  • Loudspeakers
  • Measurement
  • Microphones
  • Orientation (Direction)
  • Plane Waves
  • Quality Control
  • Sound Pressure
  • Standards
  • Test And Evaluation
  • Test Fixtures
  • Test Methods
  • Waves

Readers

  • Acoustics.
  • Regression Analysis.