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A miniaturized artificial mastoid using a skull simulator

S P Stenfelt¹, B E Håkansson

¹Department of Applied Electronics, Chalmers University of Technology, Göteborg, Sweden. stenfelt@ae.chalmers.se

Scandinavian Audiology

|June 25, 1998

Summary

A new miniaturized artificial mastoid allows for bone conduction hearing aid calibration and measurement. This device meets international standards and provides accurate results above 450 Hz.

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Area of Science:

Audiology
Biomedical Engineering
Acoustics

Background:

Bone conduction hearing aids require precise calibration.
Existing artificial mastoids can be cumbersome for standard audiometric environments.

Purpose of the Study:

To develop a miniaturized artificial mastoid for calibrating bone conduction hearing aids.
To ensure the device meets mechanical impedance standards (IEC 373:1990).

Main Methods:

Development of a three-part miniaturized artificial mastoid: coupler, skull simulator (TU-1000), and filter.
Design of a damped mass-spring system coupler for specific mechanical impedance.
Testing and comparison with a standard artificial mastoid (Brüel & Kjaer type 4930).

Main Results:

The miniaturized artificial mastoid exhibits mechanical impedance matching IEC 373 (1990) from 250 Hz to 8 kHz.
Results align with the Brüel & Kjaer type 4930 artificial mastoid for frequencies above 450 Hz.

Conclusions:

The developed miniaturized artificial mastoid is suitable for audiometer calibration.
It can be effectively used for measuring bone conduction hearing aids at relevant frequencies.

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