A comparison of ear-canal-reflectance measurement methods in an ear simulator.
J Acoust Soc Am
; 146(2): 1350, 2019 08.
Article
en En
| MEDLINE
| ID: mdl-31472530
ABSTRACT
Ear-canal reflectance has been researched extensively for diagnosing conductive hearing disorders and compensating for the ear-canal acoustics in non-invasive measurements of the auditory system. Little emphasis, however, has been placed on assessing measurement accuracy and variability. In this paper, a number of ear-canal-reflectance measurement methods reported in the literature are utilized and compared. Measurement variation seems to arise chiefly from three factors the residual ear-canal length, the ear-probe insertion angle, and the measurement frequency bandwidth. Calculation of the ear-canal reflectance from the measured ear-canal impedance requires estimating the ear-canal characteristic impedance in situ. The variability in ear-canal estimated characteristic impedance and reflectance due to these principal factors is assessed in an idealized controlled setup using a uniform occluded-ear simulator. In addition, the influence of this measurement variability on reflectance-based methods for calibrating stimulus levels is evaluated and, by operating the condenser microphone of the occluded-ear simulator as an electro-static speaker, the variability in estimating the emitted pressure from the ear is determined. The various measurement methods differ widely in their robustness to variations in the three principal factors influencing the accuracy and variability of ear-canal reflectance.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Pruebas de Impedancia Acústica
/
Estimulación Acústica
/
Conducto Auditivo Externo
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
Idioma:
En
Revista:
J Acoust Soc Am
Año:
2019
Tipo del documento:
Article
País de afiliación:
Dinamarca