Temporary Threshold Shift in Hearing from Exposure to Different Noise Spectra at Equal dBALevel
作者:
Alexander Cohen,
Joseph R. Anticaglia,
Paul L. Carpenter,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1972)
卷期:
Volume 51,
issue 2B
页码: 503-507
ISSN:0001-4966
年代: 1972
DOI:10.1121/1.1912869
出版商: Acoustical Society of America
数据来源: AIP
摘要:
The intent of this study was to determine whether sound‐level measurements in dBAcould adequately depict harmfulness to hearing from exposures to noises differing widely in spectra. Each of 11 male listeners, ages 20–26 years, were exposed in separate sessions to each of three noises whose spectral slopes were −6, 0, and +6 dB per octave band and then re‐exposed to the same test noises in three additional retest sessions. All such noises were presented for 30 min via an earphone at 100 dBA. Analyses of variance of the temporary threshold shifts in hearing caused by these noise conditions [corrected to 2 min postexposure (TTS2)] showed insignificant differences, owing to the spectral variations for both test and retest conditions as averaged across audiometric frequencies 250–8000 Hz. Interactive effects between spectra and test frequencies were significant, the −6‐ and 0‐dB spectral conditions causing relatively more TTS2at frequencies below 3000 Hz, and the +6‐dB spectrum more TTS2at frequencies above 3000 Hz. Implications of these results for noise hazard rating schemes using dBAmeasures as contrasted with spectral determinations were noted.
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