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Speech quality evaluation of subcutaneously implanted microphone using in vivo experiment

Issue title: Frontiers in Biomedical Engineering and Biotechnology – Proceedings of the 3rd International Conference on Biomedical Engineering and Biotechnology, 25–28 September 2014, Beijing, China

Article type: Research Article

Authors: Woo, Seong Tak | Lee, Gihyoun | Jung, Eui Sung | Lim, Hyung-Gyu | Seong, Ki Woong | Lee, Jyung Hyun | Kim, Myoung Nam; | Cho, Jin-Ho;

Affiliations: Graduate School of Electronics Engineering, Kyungpook National University, Sangyuk-dong, Buk-Gu, Daegu, 702-701, S. Korea | Department of Medical and Biological Engineering, Graduate School, Kyungpook National University, Dongin2-Ga, Jung-Gu, Daegu, 700-422, S. Korea | Department of Biomedical Engineering, Kyungpook National University Hospital, Dongin2-Ga, Jung-Gu, Daegu, 700-422, S. Korea | Graduate School of Medicine, Kyungpook National University, Dongin2-Ga, Jung-Gu, Daegu, 700-422, S. Korea | School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Sangyuk-dong, Buk-Gu, Daegu, 702-701, S. Korea

Note: [] Corresponding author: Jin-Ho Cho, School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Sangyuk-dong, Buk-Gu, Daegu, 702-701, S. Korea. Tel.: 82-53-427-5538; Fax: 82-53-427-5539; E-mail: [email protected].

Keywords: Implantable microphone, in vivo experiment, speech quality score, fully implantable hearing devices

DOI: 10.3233/BME-141196

Journal: Bio-Medical Materials and Engineering, vol. 24, no. 6, pp. 3685-3691, 2014

Published: 2014
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Abstract

The microphone in a fully implantable hearing device (FIHD) is generally implanted under the skin covering the temporal bone. However, the implanted microphone can be affected by the skin, which causes both sound attenuation and distortion, particularly at high frequencies. As the degree of attenuation and distortion through the skin is severe, speech quality evaluation parameters are needed for the received signal when designing an implantable microphone. However, the performance of most implantable microphones is only assessed based on the sensitivity and frequency response. Thus, practical indicators based on human auditory characteristics are needed for an objective evaluation of the performance of implantable microphones. In this study, a subcutaneously implantable microphone was designed, and its frequency response investigated using an in vivo experiment. Plus, to evaluate the objective indicators, the speech quality of the signals measured by the implanted microphone was calculated using a MATLAB program, and the indicators compared before and after implantation.

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