The Assessment of Sound Attenuation and Speech Intelligibility of Selected Active Noise Reduction Devices and the Communications Earplug When Used with the HGU-56/P Aviator Helmet

Abstract

The Program Manager for Aircrew Integrated Systems (PM-ACIS), formerly Aviation Life Support Equipment (PM-ALSE), requested the U.S. Army Aeromedical Research Laboratory (USAARL) examine the status of active noise reduction (ANR) systems available in the marketplace. The mechanism for acquiring the devices was a Cooperative Research and Development Agreement (ORDA) which was implemented with three U.S. corporations. Each corporation agreed to modify three HGU-56 aviator helmets, furnished by the Government, by installing their ANR system. The modified helmets, the communications earplug (CEP), and the standard HGU-56 helmet were evaluated by the USAARL Aircrew Protection Division to determine the electro-acoustic, hearing protective, and speech intelligibility characteristics. Standard techniques, using human subjects for sound attenuation and speech intelligibility, were used to complete the measurements.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1997
Accession Number
ADB222028

Entities

People

  • Barbara A. Murphy
  • Ben T. Mozo

Organizations

  • United States Army Aeromedical Research Lab

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Biomedical
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Ambient Noise
  • Analysis Of Variance
  • Army Aircraft
  • Attenuation
  • Birds
  • Corporations
  • Department Of Defense
  • Ear
  • Frequency Response
  • Governments
  • Human Factors Engineering
  • Losses
  • Measurement
  • Noise Reduction
  • Rotary Wing Aircraft
  • Standards
  • Test And Evaluation

Readers

  • Acoustics.
  • Human-Computer Interaction (HCI).
  • Software Engineering