Development of an Artificial Ear for Bone-Conducted Objective Occlusion Measurement

Authors: Yu Luan

Abstract:

The bone-conducted objective occlusion effect (OE) is characterized by a discomforting sensation of fullness experienced in an occluded ear. This phenomenon arises from various external stimuli, such as human speech, chewing, and walking, which generate vibrations transmitted through the body to the ear canal walls. The bone-conducted OE occurs due to the pressure build-up inside the occluded ear caused by sound radiating into the ear canal cavity from its walls. In the hearing aid industry, artificial ears are utilized as a tool for developing hearing aids. However, the currently available commercial artificial ears primarily focus on pure acoustics measurements, neglecting the bone-conducted vibration aspect. This research endeavors to develop an artificial ear specifically designed for bone-conducted occlusion measurements. Finite Element Analysis (FEA) modeling has been employed to gain insights into the behavior of the artificial ear.

Keywords: Artificial ear, bone conducted vibration, occlusion measurement, Finite Element Modeling.

References:

[1] Y. Luan, M. O. Cyr-Desroches, K. Carillo, O. Doutres, and F. Sgard, “Development and evaluation of an artificial ear for quantifying the objective occlusion effect,” 24th International Congress on Acoustics, 2022.
[2] M. Brummund, F. Sgard, Y. Petit, F. Laville, and H. Nelisse, “An Axisymmetric Finite Element Model to Study the Earplug Contribution to the Bone Conduction Occlusion Effect,” Acta Acustica united with Acustica, vol. 101, Aug. 2015, doi: 10.3813/AAA.918872.
[3] K. Carillo, O. Doutres, and F. Sgard, “Numerical investigation of the earplug contribution to the low-frequency objective occlusion effect induced by bone-conducted stimulation,” J Acoust Soc Am, vol. 150, no. 3, pp. 2006–2023, Sep. 2021, doi: 10.1121/10.0006209.
[4] K. Carillo, O. Doutres, and F. Sgard, “Theoretical investigation of the low frequency fundamental mechanism of the objective occlusion effect induced by bone-conducted stimulation,” J Acoust Soc Am, vol. 147, no. 5, pp. 3476–3489, May 2020, doi: 10.1121/10.0001237.
[5] K. Carillo, O. Doutres, and F. Sgard, “Numerical investigation of the fundamental low frequency mechanisms of the objective occlusion effect: focus on the earcanal wall vibration,” 2019.
[6] S. Hajarolasvadi, B. Essink, P. F. Hoffmann, A. Ng, U. Skov, and others, “Digital Twin of a Head and Torso Simulator: Validation of Far-Field Head-Related Transfer Functions with Measurements,” in Audio Engineering Society Conference: AES 2022 International Audio for Virtual and Augmented Reality Conference, 2022.