Hearing Protectors: Topicality and Research Needs

Canetto, Pierre

doi:10.1080/10803548.2009.11076795

Cited by 19 publications

(11 citation statements)

References 21 publications

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“…Combined use was estimated to offer an additional reduction up to 3 dB(A). In practice, the attenuation of the HPDs will have been dependent on the proper fit and maintenance of the devices15 and may have been less than reported by manufacturers of these devices 16…”

Section: Methodsmentioning

confidence: 99%

Hearing loss associated with repeated MRI acquisition procedure-related acoustic noise exposure: an occupational cohort study

2017

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From our longitudinal cohort study, it appeared that exposure to noise from voluntarily MRI scans may have resulted in a slight amount of hearing loss. Mandatory use of hearing protection might have prevented more severe hearing loss. Lack of consistency in findings between the left and right ears and between the two exposure measures prohibits definitive conclusions. Further research that addresses the study's methodological limitations is warranted to corroborate our findings.

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Section: Methodsmentioning

confidence: 99%

Hearing loss associated with repeated MRI acquisition procedure-related acoustic noise exposure: an occupational cohort study

2017

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“…Despite hearing conservation programs implemented in the workplace, occupational hearing loss is an ongoing problem [4]. Two important factors that may contribute to this is the difficulty to assess workers' actual noise exposure while wearing protectors [18,15] and each workers' individual vulnerability to a given noise dose [7].…”

Section: Introductionmentioning

confidence: 99%

Use of passive hearing protectors and adaptive noise reduction for field recording of otoacoustic emissions in industrial noise

Nadon¹,

Bockstael²,

Keppler³

et al. 2013

Proceedings of Meetings on Acoustics

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Distortion Product Otoacoustic Emissions (DPOAEs) can detect noise-induced hearing loss in-field, but their data extraction is very sensitive to background noise. This paper investigates how passive and active noise reduction enhance DPOAE recording based on data collected in white noise from 54dB(A) to 90dB(A). Despite considerable high-frequency attenuation from a proper placed DPOAE probe, 54dB(A) background noise deteriorates the test outcome substantially. More low-frequency attenuation by an extra passive earmuff enables measurements in white noise levels of 70dB(A). The relationship between external sound level and noise recorded by the DPOAE system has been statistically modeled. Additionally, the upper limits of attenuation improvement are analyzed by quantifying residual physiological noise. Furthermore, for an earplug integrating microphone and speakers of the DPOAE measurement probe, adaptive noise reduction processing on the DPOAE signal is used to improve the Signal-to-Noise ratio. The adaptive noise reduction (ANR) is implemented using the NLMS algorithm to filter out the ambiant noise, measured by the first microphone measuring the DPOAE signal, with a second miniature microphone mounted flush with the external faceplate of the isolating DPOAE probe. Simulated data shows that DPOAE response extraction is possible in an environment with noise levels exceeding 70dB(A).

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“…Occupational hearing loss remains a problem, despite the efforts made by implementing hearing conservation programs in the workplace [5]. The first issue is that the actual passive noise reduction of the hearing protector worn during the work shift greatly differs from the optimal passive noise reduction measured in laboratory due to suboptimal placement, inconsistent use and general variations in the acoustical seal over time [21] .…”

Section: Introductionmentioning

confidence: 99%

Individual monitoring of hearing status: Development and validation of advanced techniques to measure otoacoustic emissions in suboptimal test conditions

Nadon

Bockstael²,

Botteldooren³

et al. 2015

Applied Acoustics

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Scientific evidence suggests that measurement of otoacoustic emissions (OAE) is a reliable tool to detect the early onset of noise induced hearing loss. Nevertheless, the individual field measurement of otoacoustic emissions on industrial workers is very challenging in practice because the high level of ambient noise usually disturbs the OAE measurement. The use of OAE measurement probes with high passive noise isolation allows the attenuation of most of the high frequency ambient noise, but it is often insufficient for the low frequency content of the ambient noise. In the described research, a new type of OAE system, suitable for the continuous monitoring of OAE levels on an individual worker, has been designed as a pair of earpieces each featuring an external microphone, an internal microphone and a pair of miniature receivers. Adaptive noise reduction (ANR) processing the measured distortion product OAE (DPOAE) is used to further improve the Signal-to-Noise ratio in frequencies mostly where passive isolation remains insufficient. The ANR technique relies on a Normalized Least-Mean-Square (NLMS) algorithm that uses the ipsilateral external microphone and the contralateral internal microphone to denoise the measured DPOAE signals for each in-ear OAE probe. A side-by-side comparison with commercially available clinical OAE equipment on 8 test-subjects successfully confirmed that the developed OAE system would be suitable for the continuous monitoring of workers' hearing capabilities in industrial noise environments with levels up to 75 dB(A).

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Hearing Protectors: Topicality and Research Needs

Abstract: occupational noise hearing protectors human behaviour attenuation real world derating subject-fit comfort research

Cited by 19 publications

References 21 publications

Hearing loss associated with repeated MRI acquisition procedure-related acoustic noise exposure: an occupational cohort study

Hearing loss associated with repeated MRI acquisition procedure-related acoustic noise exposure: an occupational cohort study

Use of passive hearing protectors and adaptive noise reduction for field recording of otoacoustic emissions in industrial noise

Individual monitoring of hearing status: Development and validation of advanced techniques to measure otoacoustic emissions in suboptimal test conditions

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