An Influence of Directional Microphones on the Speech Intelligibility and Spatial Perception by Cochlear Implant Users

• Autorzy: Kordus M. , Tyler R. S. , Żera J. , Oleson J. J.

Identyfikatory

DOI

10.1515/aoa-2015-0010

• Języki publikacji: EN

Abstrakty

EN

The objective of the study is to assess the hearing performance of cochlear implant users in three device microphone configurations: omni-directional, directional, and beamformer (BEAMformer two-adaptive noise reduction system), in localization and speech perception tasks in dynamically changing listening environments. Seven cochlear implant users aided with Cochlear CM-24 devices with Freedom speech processor participated in the study. For the localization test in quiet and in background noise, subjects demonstrated significant differences between different microphone settings. Confusion matrices showed that in about 70% cases cochlear implant subjects correctly localized sounds within a horizontal angle of 30–40◦ (±1◦ loudspeaker apart from signal source). However localization in noise was less accurate as shown by a large number of considerable errors in localization in the confusion matrices. Average results indicated no significant difference between three microphone configurations. For speech presented from the front 3 dB SNR improvements in speech intelligibility in three subjects can be observed for beamforming system compared to directional and omni-directional microphone settings. The benefits of using different microphone settings in cochlear implant devices in dynamically changing listening conditions depend on the particular sound environment.

Słowa kluczowe

EN

localization; bilateral cochlear implants; adults; microphone; beamformer

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2015
• Tom: Vol. 40, No. 1
• Strony: 81--92
• Opis fizyczny: Bibliogr. 46 poz., rys., tab., wykr.

Twórcy

autor

Kordus M.

• Department of Biophysics, Poznan University of Medical Science, Fredry 10, 61-701 Poznań, Poland

autor

Tyler R. S.

• Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals & Clinics, 200 Hawkins Drive, Iowa City, IA 52242, USA

autor

Żera J.

• Faculty of Electronics and Information Technology, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland

autor

Oleson J. J.

• College of Public Health, Department of Biostatistics, University of Iowa Hospitals & Clinics, 145N. Riverside Drive, Iowa City, IA 52242, USA

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