| Measurement of equal-loudness contours using eardrum pressure as reference signal. | |
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MedLine Citation:
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PMID: 18531337 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Equal-loudness contours represent the relationship of loudness perception and sound pressure at the ear. Usually, the reference pressure is defined with a standardised calibration procedure. Individual ear canal characteristics significantly influence the contours, resulting in peaks and notches. By choosing the eardrum pressure as reference for the perception measurements, individual ear canal features are cancelled, when loudness and pressure are related. Thus, flatter contours can be achieved. Finite-element simulations of the sound field in the canal have shown that signals at remote positions may differ significantly from the eardrum pressure. Thus, to achieve eardrum related measurements, it is necessary to insert probe microphones sufficiently deep into the canal. However, the desired signal has to be estimated from a distance, since measurements directly at the drum are not practical. A method is shown to determine both the probe tip distance and the transformation terms to calculate the drum pressure estimate. In this contribution, the results of equal-loudness contour measurements are discussed. The positioning and transformation processes are verified by simulations with one-dimensional and finite-element models and experiments. |
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Authors:
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Sebastian Schmidt; Herbert Hudde |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 123 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2008 May |
Date Detail:
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Created Date: 2008-06-05 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 3564 Citation Subset: IM |
Affiliation:
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Institute of Communication Acoustics, Ruhr-Universität Bochum, IC 1142, Universitätsstr. 150, 44780 Bochum, Germany, sebastian.schmidt@rub.de. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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