Using hearing aid adaptive directional microphones to enhance cochlear implant performance |
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Authors: | King Chung Fan-Gang Zeng |
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Affiliation: | aDepartment of Speech, Language, and Hearing Sciences, Purdue University, 500 Oval Dr., West Lafayette, IN 47906, USA;bDepartment of Otolaryngology-Head and Neck Surgery, University of California, Irvine, 364 Med Surge II, Irvine, CA 92697, USA |
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Abstract: | The goal of this study was to investigate whether adaptive microphone directionality could enhance cochlear implant performance. Speech stimuli were created by fitting a digital hearing aid with programmable omnidirectional (OM), fixed directional (FDM), or adaptive directional (ADM) microphones to KEMAR, and recording the hearing aid output in three noise conditions. The first condition simulated a diffused field with noise sources from five stationary locations, whereas the second and third condition represented one or three non-stationary locations in the back hemifield of KEMAR. Speech was always presented to 0° azimuth and the overall signal-to-noise ratio (SNR) was +5 dB in the sound field. Eighteen postlingually deafened cochlear implant users listened to the recorded test materials via the direct audio input of their speech processors. Their speech recognition ability and overall sound quality preferences were assessed and the correlation between the amount of noise reduction and the improvement in speech recognition were calculated. The results indicated that ADM yielded significantly better speech recognition scores and overall sound quality preference than FDM and OM in all three noise conditions and the improvement in speech recognition scores was highly correlated with the amount of noise reduction. Factors influencing the noise level are discussed. |
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Keywords: | Cochlear implant Adaptive Directional microphone Hearing aid Speech recognition Sound quality |
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