CONSTRAINTS IN THE APPLICATION OF PERSONAL ACTIVE NOISE REDUCTION SYSTEMS

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Authors
  1. Crabtree, R.B.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Active Noise Reduction (ANR) systems built into personally-worn headsets and helmets, when properly designed and carefully fitted, have shown considerable potential for reducing noise exposure and improving the listening conditions under which auditory tasks are carried out in military operations. Performance limitations have been identified in certain devices, however. Some have a tendency to overload easily or to cease operating under adverse conditions, and others become unstable when the seal around the ear is broken. Recent findings indicate strongly that proper fitting around the ear is a functional necessity for satisfactory ANR operation. This is particularly true of units having a low tolerance to overloading and those which continue to operate in the infrasound frequency range. As a consequence, the function of any ANR system must be understood within the context of its intended operating environment in order to estimate whether the system will perform satisfactorily.
Report Number
DCIEM-96-P-56 — Paper
Date of publication
01 Sep 1996
Number of Pages
9
DSTKIM No
99-00090
CANDIS No
510014
Format(s):
Hardcopy;Document Image stored on Optical Disk

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