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Project Details
Description
Traditional sound exposure assessment methods use the A-weighting function to give frequency dependent significance to the components of the exposure. It is thereby assumed that exposures that have the same equivalent A-weighted sound pressure level will pose the same risk of damage to the auditory system. In order to investigate this premise, the effect of sound exposures with the same equivalent A-weighted sound pressure levels but different frequency contents was evaluated through a temporal threshold shift (TTS) experiment. A recording of an industrial mill was made in a workshop. The recordings were post-processed so that three 2-octave band signals centered at 250 Hz, 1 kHz and 4 kHz were constructed. The signals were adjusted to have the same equivalent A-weighted level, and used as fatiguing stimuli in a threshold shift experiment including nine subjects. The results show that the high band produced the greatest threshold shift, spreading over a greater frequency range, and with a longer recovery period. The 2-octave band centered at 1 kHz also produced TTS, while the band centered at 250 Hz did not produce any TTS of significance. Analysis of the results through a stochastic model (see project "Temporary threshold shifts due to short tonal over-exposure"), confirms the observations on the results. In conclusion, this project has shown some evidence that contradicts the assumption that exposures with the same A-weighted level pose the same risk for the hearing, considering TTS as an early indicator of possible noise induced hearing loss. Supported by STVF/FTP.
Status | Finished |
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Effective start/end date | 19/05/2010 → 31/12/2017 |
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Projects
- 1 Finished
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Assessment of risk of noise induced hearing damage
de Toro, M. A. A., Reuter Andersen, K., Hammershøi, D. & Ordoñez, R.
19/05/2010 → 31/12/2017
Project: Research
Research output
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Time and frequency weightings and the assessment of sound exposure
Ordoñez, R. P., de Toro, M. A. A. & Hammershøi, D., 2010, In: Noise-Con Proceedings. 10 p.Research output: Contribution to journal › Conference article in Journal › Research › peer-review
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Effects of frequency content from exposures with the same A-weighted equivalent level
Ordoñez, R. P. & Hammershøi, D., 2006, Proceedings of Inter-Noise 2006: The 35th International Congress and Exposition on Noise Control Engineering. Institute of Noise Control Engineering of the USA, Inc., 10 p.Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research
4 Citations (Scopus) -
Når støjen skader: nye metoder kan forhindre fremtidens høreskader
Ordonez, R., Hammershøi, D., Møller, H. & Petersen, A-L. S., 2005, In: Aktuel Naturvidenskab. 5, p. 7-9Research output: Contribution to journal › Journal article › Communication