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The interaction of impulse and continuous noise: energy and spectral considerations in the production of hearing loss.

Authors
Roberto-M; Ahroon-WA; Davis-RI; Hamernik-RP
Source
J Acoust Soc Am 1987 Mar; 81(Suppl 1):S76
NIOSHTIC No.
20045146
Abstract
Realistic industrial noise environments containing impulsive and continuous noise were modeled using a 5-day exposure paradigm that produces an asymptotic threshold shift (ATS). Pre- and postexposure measures of hearing thresholds were obtained on 96 chinchillas using evoked auditory responses (EAR). Six control groups were exposed to octave bands of noise at 0.5, 2.0, and 4.0 kHz at 95, 90, and 86 dB SPL, respectively, or impacts of 113, 119, or 125 dB peak SPL presented once per 1, 4, or 16 s, respectively. Nine interaction groups were exposed to combinations of an impulse and continuous noise. The greatest spectral overlap of energy occurs between the impulse and the 0.5 kHz octave band of noise. Although each of the different impulse noise exposures were balanced to produce an equal energy exposure, an exacerbation of hearing loss was produced in animals exposed to the 119- and 125-dB impacts in combination with the low-frequency (0.5-kHz) continuous noise. This synergistic effect gradually disappears when the spectral overlap between noises is reduced. [Research supported by NIOSH.]
Keywords
Industrial-noise; Noise; Noise-exposure; Noise-frequencies; Environmental-exposure; Exposure-levels; Audiofrequency; Sound; Environmental-exposure; Environmental-hazards; Hazards; Sensory-thresholds; Models; Acoustics; Acoustic-signals; Animals; Laboratory-animals; Hearing-loss; Hearing
CODEN
JASMAN
Publication Date
19870301
Document Type
Abstract
Funding Type
Grant
Fiscal Year
1987
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-002317
ISSN
0001-4966
Source Name
Journal of the Acoustical Society of America
State
NY
Performing Organization
State University of New York at Buffalo, Buffalo, New York
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