Active Noise Reduction,

Abstract

Active Noise Reduction (ANR) techniques, singly and in combination with passive hearing protectors, offer the potential for increased sound protection, enhanced voice communications and improved wearability features for personnel exposed to unacceptable noise conditions. An enhanced closed loop active noise reduction system was miniaturized and incorporated into a standard Air Force flight helmet (HGU-26/P). This report describes the theory of design and operation, prototype configuration and operation, and electroacoustic performance and specifications for the ANR system. This system is theoretically capable of producing in excess of 30 decibels of active noise reduction. Electroacoustic measurements on a flat palte coupler demonstrated approximately 20 decibels of active noise reduction with the prototype unit. A performance evaluation of the integrated ANR unit will be conducted under laboratory and field conditions by government personnel to determine the feasibility of the system for use in military applications. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1984
Accession Number
ADA139741

Entities

People

  • Jennifer Carter

Organizations

  • Bose Corporation

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Biomedical
  • Energy and Power Technologies
  • Human Systems

DTIC Thesaurus Topics

  • Air Force
  • Amplifiers
  • Biomedical Research
  • Closed Loop Systems
  • Communication Systems
  • Contracts
  • Electronics
  • Engineering
  • Flight Helmets
  • Frequency
  • Frequency Response
  • Hearing Protection
  • Human Factors Engineering
  • Measurement
  • Noise Reduction
  • Open Loop Systems
  • Standards

Readers

  • Acoustics.
  • Software Engineering