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Derivation of an analytic expression for the error associated with the noise reduction rating.

Authors
Murphy-WJ
Source
J Acoust Soc Am 2005 Apr; 117(4):2481
NIOSHTIC No.
20045238
Abstract
Hearing protection devices are assessed using the Real Ear Attenuation at Threshold (REAT) measurement procedure for the purpose of estimating the amount of noise reduction provided when worn by a subject. The rating number provided on the protector label is a function of the mean and standard deviation of the REAT results achieved by the test subjects. If a group of subjects have a large variance, then it follows that the certainty of the rating should be correspondingly lower. No estimate of the error of a protector's rating is given by existing standards or regulations. Propagation of errors was applied to the Noise Reduction Rating to develop an analytic expression for the hearing protector rating error term. Comparison of the analytic expression for the error to the standard deviation estimated from Monte Carlo simulation of subject attenuations yielded a linear relationship across several protector types and assumptions for the variance of the attenuations.
Keywords
Hearing-level; Hearing-loss; Hearing-acuity; Health-surveys; Age-factors; Age-groups; Information-retrieval-systems; Physical-examination; Racial-factors; Sex-factors; Audiological-testing; Audiometry
Contact
William J. Murphy, Hearing Loss Prevention Team, NIOSH, 4676 Columbia Pkwy., MS C-27, Cincinnati, OH 45226-1998
CODEN
JASMAN
Publication Date
20050401
Document Type
Abstract
Email Address
wjm4@cdc.gov
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Issue of Publication
4
ISSN
0001-4966
NIOSH Division
DART
Source Name
Journal of the Acoustical Society of America
State
OH
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