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Active noise cancellation-performance in a hearing protector under ideal and degraded conditions.

Authors
Bartholomae-RC
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9506, 1994 Jan; :1-12
Link
NIOSHTIC No.
10012362
Abstract
The U.S. Bureau of Mines study found that the performance of the active noise cancellation hearing protector in a reverberant field was mixed. The performance varied when the conditions changed from ideal to nonideal. The active noise cancellation (ANC) component provided substantial additional noise reduction from 125 to 500 Hz for all testing conditions (broadband noise or pure tones both with and without safety glasses). While the ANC under ideal conditions provided additional attenuation from 500 Hz and below, under nonideal pink noise conditions the ANC amplified noise below the 125 Hz third octave band. There was a middle band of frequencies at which the ANC amplified noise levels ranging from 630 to 4,000 Hz. The results for pure tones showed that attenuations were higher but that they followed the same general trend.
Keywords
Auditory-perception; Reverberation; Ear-protectors; Mine-safety; Noise-sound; Mining-industry; Hearing-conservation; Hearing-protection
Publication Date
19940101
Document Type
Report of Investigations
Fiscal Year
1994
NTIS Accession No.
PB94-173705
NTIS Price
A03
Identifying No.
RI-9506
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9506
State
PA
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