Two-microphone spatial filtering provides speech reception benefits for cochlear implant users in difficult acoustic environments
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Braida_Two-microphone.pdf
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Author(s)
Goldsworthy, Raymond L.
Delhorne, Lorraine A.
Desloge, Joseph G.
Braida, Louis D.
Date Issued
August 2014
Journal
The Journal of the Acoustical Society of America
Publisher
Acoustical Society of America (ASA)
Citation
Goldsworthy, Raymond L., Lorraine A. Delhorne, Joseph G. Desloge, and Louis D. Braida. “Two-Microphone Spatial Filtering Provides Speech Reception Benefits for Cochlear Implant Users in Difficult Acoustic Environments.” J. Acoust. Soc. Am. 136, no. 2 (August 2014): 867–876. © 2014 Acoustical Society of America
Version
Final published version
Abstract
This article introduces and provides an assessment of a spatial-filtering algorithm based on two closely-spaced (∼1 cm) microphones in a behind-the-ear shell. The evaluated spatial-filtering algorithm used fast (∼10 ms) temporal-spectral analysis to determine the location of incoming sounds and to enhance sounds arriving from straight ahead of the listener. Speech reception thresholds (SRTs) were measured for eight cochlear implant (CI) users using consonant and vowel materials under three processing conditions: An omni-directional response, a dipole-directional response, and the spatial-filtering algorithm. The background noise condition used three simultaneous time-reversed speech signals as interferers located at 90°, 180°, and 270°. Results indicated that the spatial-filtering algorithm can provide speech reception benefits of 5.8 to 10.7 dB SRT compared to an omni-directional response in a reverberant room with multiple noise sources. Given the observed SRT benefits, coupled with an efficient design, the proposed algorithm is promising as a CI noise-reduction solution.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1121/1.4887453
