Passive Attenuating Communication Earphone (PACE): Noise Attenuation and Speech Intelligibility Performance When Worn in Conjunction with the HGU-56/P and HGU-55/P Flight Helmets

Abstract

Noise attenuation and speech intelligibility measurements were conducted in accordance with American National Standards Institute (ANSI) S12.6 Methods for Measuring the Real-Ear Attenuation of Hearing Protectors and ANSI S3.2 Method for Measuring the Intelligibility of Speech over Communication Systems on the HGU-56/P and HGU-55/P flight helmets worn in conjunction with PACE in-the-ear, in-the-canal, and general purpose earplugs. The passive noise attenuation results for both helmets show an increase in attenuation across all frequencies from 125 to 8000 Hz with the PACE earplugs when compared to the helmet alone. Speech intelligibility results found average subject scores to be greater than 80% (necessary to meet air worthiness requirements) across all helmet configurations in the worst case noise condition.

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Document Details

Document Type
Technical Report
Publication Date
Oct 16, 2013
Accession Number
ADA592092

Entities

People

  • Hilary L. Gallagher

Organizations

  • Ball Aerospace & Technologies

Tags

Communities of Interest

  • Human Systems

DTIC Thesaurus Topics

  • Acoustics
  • Air Force
  • Air Force Research Laboratories
  • Communication Systems
  • Department Of Defense
  • Ear
  • Earphones
  • Flight Helmets
  • Frequency
  • Government Procurement
  • Governments
  • Human Factors Engineering
  • Language
  • Measurement
  • Speech
  • Standards
  • Systems Engineering

Readers

  • Acoustics.