| Zugriffsnummer | 25359 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Calibration of otoacoustic emission probes with a simulated reference loudspeaker at the eardrum |
| Autor(in); Institution |
Zebian, Makram Anwar; 1.6, Schall, PTB-Braunschweig; International Graduate School of Metrology (IGSM), Braunschweig, GERMANY
Hensel, Johannes; 1.6, Schall, PTB-Braunschweig
Fedtke, Thomas; 1.6, Schall, PTB-Braunschweig
|
| Quelle/Jahr | 1st EAA Euroregio 2010, Congress on Sound and Vibration:(2010), 8 S. |
| Availability | [CD-ROM] ; file name: EAA-EUROREGIO-116.pdf |
| ISBN | 978-961-269-283-4 |
| Verlag | Ljubljana: Slovenian Acoustical Society |
| Konferenzangaben | 1st EAA EuroRegio 2010 Congress on Sound and Vibration, Ljubljana, 15-18, September, 2010, Slovenia |
| Klassifikationscode | PACS: 43.20.+g ; PACS: 43.64.+r |
| Zusammenfassung | Distortion product otoacoustic emissions (DPOAEs) measured in the human ear canal provide an attractive method to assess the functionality of the cochlear outer hair cells. These emissions, elicited in response to two pure-tone stimuli, are recorded in the ear canal by means of a DPOAE probe. However, the calibration of these probes is still problematic, especially at frequencies above 4 kHz due to standing waves in the ear canal. The objective of the current study is to present a calibration procedure for the DPOAE probe using the reciprocity theorem. This involves simulations of two miniature loudspeakers in an adult ear canal model with the first loudspeaker located at the entrance of the ear canal and the second situated in the vicinity of the model eardrum. Two transfer functions can, thus, be obtained with the probe microphone at the entrance of the ear canal, relating the respective loudspeaker volume velocity to the sound pressure at the microphone. A calibration function is then calculated from these two transfer functions. This calibration procedure is evaluated both analytically and by means of the finite element method and results in an adequate compensation of standing wave minima. The feasibility as well as the practical limitations of this procedure are discussed. |
