Document Detail

Measurement of equal-loudness contours using eardrum pressure as reference signal.
MedLine Citation:
PMID:  18531337     Owner:  NLM     Status:  In-Data-Review    
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.
Sebastian Schmidt; Herbert Hudde
Related Documents :
18396997 - On the sound field of a resilient disk in free space.
18531537 - High sound pressure models for microperforated panels backed by an air cavity.
8487517 - Speech production changes under fluency-evoking conditions in nonstuttering speakers.
17930767 - Influence of pressure on the boson peak: stronger than elastic medium transformation.
15174897 - The epithelial sodium channel in hypertension: genetic heterogeneity and implications f...
10567257 - Pressure effect on hydrogen isotope fractionation between brucite and water at elevated...
Publication Detail:
Type:  Journal Article    
Journal Detail:
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:
Created Date:  2008-06-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3564     Citation Subset:  IM    
Institute of Communication Acoustics, Ruhr-Universität Bochum, IC 1142, Universitätsstr. 150, 44780 Bochum, Germany,
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Pitch discrimination: Combination of information across frequency.
Next Document:  Roughness detection in fricative-like noise and tone stimuli.