Distribution of standing-wave errors in real-ear sound-level measurements

Susan A. Richmond, Judy G. Kopun, Stephen T Neely, Hongyang Tan, Michael P Gorga

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Standing waves can cause measurement errors when sound-pressure level (SPL) measurements are performed in a closed ear canal, e.g., during probe-microphone system calibration for distortion-product otoacoustic emission (DPOAE) testing. Alternative calibration methods, such as forward-pressure level (FPL), minimize the influence of standing waves by calculating the forward-going sound waves separate from the reflections that cause errors. Previous research compared test performance (Burke, 2010) and threshold prediction (Rogers, 2010) using SPL and multiple FPL calibration conditions, and surprisingly found no significant improvements when using FPL relative to SPL, except at 8 kHz. The present study examined the calibration data collected by Burke and Rogers from 155 human subjects in order to describe the frequency location and magnitude of standing-wave pressure minima to see if these errors might explain trends in test performance. Results indicate that while individual results varied widely, pressure variability was larger around 4 kHz and smaller at 8 kHz, consistent with the dimensions of the adult ear canal. The present data suggest that standing-wave errors are not responsible for the historically poor (8 kHz) or good (4 kHz) performance of DPOAE measures at specific test frequencies.

Original languageEnglish (US)
Pages (from-to)3134-3140
Number of pages7
JournalJournal of the Acoustical Society of America
Volume129
Issue number5
DOIs
StatePublished - May 1 2011

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ear
standing waves
acoustics
sound pressure
canals
performance tests
causes
products
microphones
sound waves
Ear
Waves
Sound
trends
thresholds
probes
predictions
Calibration

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

Distribution of standing-wave errors in real-ear sound-level measurements. / Richmond, Susan A.; Kopun, Judy G.; Neely, Stephen T; Tan, Hongyang; Gorga, Michael P.

In: Journal of the Acoustical Society of America, Vol. 129, No. 5, 01.05.2011, p. 3134-3140.

Research output: Contribution to journalArticle

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