Quantifying undesired parallel components in Thévenin-equivalent acoustic source parameters

Kren Rahbek Nørgaard, Stephen T. Neely, Daniel M. Rasetshwane

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The calibration of an ear probe to determine its Thévenin-equivalent acoustic source parameters facilitates the measurement of ear-canal impedance and reflectance. Existing calibration error metrics, used to evaluate the quality of a calibration, are unable to reveal undesired parallel components in the source parameters. Such parallel components can result from, e.g., a leak in the ear tip or improperly accounting for evanescent modes, and introduce errors into subsequent measurements of impedance and reflectance. This paper proposes a set of additional error metrics that are capable of detecting such parallel components by examining the causality of the source admittance in the frequency domain and estimating the source pressure in the time domain. The proposed and existing error metrics are applied to four different calibrations using two existing calibration methods, representing typical use cases and introducing deliberate parallel components. The results demonstrate the capability of the proposed error metrics in identifying various undesired components in the source parameters that might otherwise go undetected.

Original languageEnglish (US)
Pages (from-to)1491-1503
Number of pages13
JournalJournal of the Acoustical Society of America
Volume143
Issue number3
DOIs
StatePublished - Mar 1 2018

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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