Accession Number:

ADA139741

Title:

Active Noise Reduction,

Descriptive Note:

Corporate Author:

BOSE CORP FRAMINGHAM MASS

Personal Author(s):

Report Date:

1984-01-01

Pagination or Media Count:

39.0

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-26P. 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

Subject Categories:

  • Flight Control and Instrumentation
  • Acoustics
  • Protective Equipment
  • Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE