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Multi-microphone adaptive noise reduction strategies for coordinated stimulation in bilateral cochlear implant devices
Kokkinakis, Kostas Loizou, Philipos C.
Kokkinakis, Kostas
Loizou, Philipos C.
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Abstract
Bilateral cochlear implant (BI-CI) recipients achieve high word recognition scores in quiet listening conditions. Still, there is a substantial drop in speech recognition performance when there is reverberation and more than one interferers. BI-CI users utilize information from just two directional microphones placed on opposite sides of the head in a so-called independent stimulation mode. To enhance the ability of BI-CI users to communicate in noise, the use of two computationally inexpensive multi-microphone adaptive noise reduction strategies exploiting information simultaneously collected by the microphones associated with two behind-the-ear (BTE) processors (one per ear) is proposed. To this end, as many as four microphones are employed (two omni-directional and two directional) in each of the two BTE processors (one per ear). In the proposed two-microphone binaural strategies, all four microphones (two behind each ear) are being used in a coordinated stimulation mode. The hypothesis is that such strategies combine spatial information from all microphones to form a better representation of the target than that made available with only a single input. Speech intelligibility is assessed in BI-CI listeners using IEEE sentences corrupted by up to three steady speech-shaped noise sources. Results indicate that multi-microphone strategies improve speech understanding in single- and multi-noise source scenarios.
Description
This is the published version, also available here: http://dx.doi.org/10.1121/1.3372727.
Date
2010-02-05
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Acoustical Society of America
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Keywords
Microphones, Cochlear implants, Speech, Acoustic noise, Acoustic beamforming
Citation
Kokkinakis, Kostas & Loizou, Philipos C. "Multi-microphone adaptive noise reduction strategies for coordinated stimulation in bilateral cochlear implant devices." J. Acoust. Soc. Am. 127, 3136 (2010); http://dx.doi.org/10.1121/1.3372727.