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Noise Attenuating Properties of Earmuffs Worn by Miners. Volume 1: Comparison of Earmuff Attenuation as Measured by Psychophysical and Physical Methods.

Authors
Stewart-KC; Burgi-EJ
Source
NTIS: PB/83-257063 :46 pages
Link
NIOSHTIC No.
10003112
Abstract
This contract was directed toward a study of the attenuating properties of earmuffs as worn by miners. Two attenuation measurement procedures were utilized. Human subjects were tested in a diffuse sound field according to threshold shift procedures recommended by the American National Standards Institute and a physical measurement procedure was accomplished in the same diffuse field on the same subjects with microphones placed simultaneously on the inside and outside of the muffs. All measurements were obtained on 1/3 octave of random noise. The results indicated that physical and psycho-physical attenuation measurements are in essential agreement at frequencies from 125 hz to 2 khz. Above 2 khz the psychophysical measurement demonstrates larger amounts of attenuation than the physical measurement. The difference in attenuation ranged from approximately 7.0 to 9.0 Db at frequencies of 4 khz and above. A possible explanation for the differences in attenuation is presented.
Publication Date
19800101
Document Type
CP; Final Contract Report;
Fiscal Year
1980
NTIS Accession No.
PB83-257063
NTIS Price
A04
Identifying No.
OFR 152(1)-83
NIOSH Division
PRC;
Source Name
NTIS: PB/83-257063
Performing Organization
University of Pittsburgh
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