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Verifying the attenuation of earplugs in situ: Method validation using artificial head and numerical simulations

Annelies Bockstael (UGent) , Bram de Greve (UGent) , Timothy Van Renterghem (UGent) , Dick Botteldooren (UGent) , Wendy D'Haenens (UGent) , Hannah Keppler (UGent) , Leen Maes (UGent) , Birgit Philips (UGent) , Freya Swinnen (UGent) and Bart Vinck (UGent)
Author
Organization
Abstract
The use of in situ measurements of hearing protectors’ (HPD’s) attenuation following the microphone in real ear (MIRE) protocol is increasing. The attenuation is hereby calculated from the difference in sound levels outside the ear and inside the ear canal behind the HPD. Custom-made earplugs have been designed with an inner bore that allows inserting a miniature microphone. A thorough understanding of the difference, henceforth called transfer function, between the sound pressure of interest at the eardrum and the one measured at the inner bore of the HPD is indispensable for optimizing the MIRE technique and extending its field of application. This issue was addressed by measurements on a head-and-torso-simulator and finite difference time domain numerical simulations of the outer ear canal occluded by an earplug. Both approaches are in good agreement and reveal a clear distinction between the sound pressure at the MIRE microphone and at eardrum, but the measured transfer functions appear to be stable and reproducible. Moreover, the most striking features of the transfer functions can be traced down to the geometrical and morphological characteristics of the earplug and ear canal.

Citation

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MLA
Bockstael, Annelies, Bram de Greve, Timothy Van Renterghem, et al. “Verifying the Attenuation of Earplugs in Situ: Method Validation Using Artificial Head and Numerical Simulations.” JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 124.2 (2008): 973–981. Print.
APA
Bockstael, A., de Greve, B., Van Renterghem, T., Botteldooren, D., D’Haenens, W., Keppler, H., Maes, L., et al. (2008). Verifying the attenuation of earplugs in situ: Method validation using artificial head and numerical simulations. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 124(2), 973–981.
Chicago author-date
Bockstael, Annelies, Bram de Greve, Timothy Van Renterghem, Dick Botteldooren, Wendy D’Haenens, Hannah Keppler, Leen Maes, Birgit Philips, Freya Swinnen, and Bart Vinck. 2008. “Verifying the Attenuation of Earplugs in Situ: Method Validation Using Artificial Head and Numerical Simulations.” Journal of the Acoustical Society of America 124 (2): 973–981.
Chicago author-date (all authors)
Bockstael, Annelies, Bram de Greve, Timothy Van Renterghem, Dick Botteldooren, Wendy D’Haenens, Hannah Keppler, Leen Maes, Birgit Philips, Freya Swinnen, and Bart Vinck. 2008. “Verifying the Attenuation of Earplugs in Situ: Method Validation Using Artificial Head and Numerical Simulations.” Journal of the Acoustical Society of America 124 (2): 973–981.
Vancouver
1.
Bockstael A, de Greve B, Van Renterghem T, Botteldooren D, D’Haenens W, Keppler H, et al. Verifying the attenuation of earplugs in situ: Method validation using artificial head and numerical simulations. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA. 2008;124(2):973–81.
IEEE
[1]
A. Bockstael et al., “Verifying the attenuation of earplugs in situ: Method validation using artificial head and numerical simulations,” JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, vol. 124, no. 2, pp. 973–981, 2008.
@article{445686,
  abstract     = {The use of in situ measurements of hearing protectors’ (HPD’s) attenuation following the
microphone in real ear (MIRE) protocol is increasing. The attenuation is hereby calculated from the
difference in sound levels outside the ear and inside the ear canal behind the HPD. Custom-made
earplugs have been designed with an inner bore that allows inserting a miniature microphone. A
thorough understanding of the difference, henceforth called transfer function, between the sound
pressure of interest at the eardrum and the one measured at the inner bore of the HPD is
indispensable for optimizing the MIRE technique and extending its field of application. This issue
was addressed by measurements on a head-and-torso-simulator and finite difference time domain
numerical simulations of the outer ear canal occluded by an earplug. Both approaches are in good
agreement and reveal a clear distinction between the sound pressure at the MIRE microphone and
at eardrum, but the measured transfer functions appear to be stable and reproducible. Moreover, the
most striking features of the transfer functions can be traced down to the geometrical and
morphological characteristics of the earplug and ear canal.},
  author       = {Bockstael, Annelies and de Greve, Bram and Van Renterghem, Timothy and Botteldooren, Dick and D'Haenens, Wendy and Keppler, Hannah and Maes, Leen and Philips, Birgit and Swinnen, Freya and Vinck, Bart},
  issn         = {0001-4966},
  journal      = {JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA},
  language     = {eng},
  number       = {2},
  pages        = {973--981},
  title        = {Verifying the attenuation of earplugs in situ: Method validation using artificial head and numerical simulations},
  volume       = {124},
  year         = {2008},
}

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