A beamformer post-filter for cochlear implant noise reduction

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dc.contributor.authorHersbach, Adam
dc.contributor.authorGrayden, David
dc.contributor.authorFallon, James
dc.contributor.authorMcDermott, Hugh
dc.date.accessioned2013-05-08T02:23:48Z
dc.date.available2013-05-08T02:23:48Z
dc.date.issued2013-04
dc.description.abstractCochlear implant users have limited ability to understand speech in noisy conditions. Signal processing methods to address this issue that use multiple microphones typically use beamforming to perform noise reduction. However, the effectiveness of the beamformer is diminished as the number of interfering noises increases and the acoustic environment becomes more diffuse. A multimicrophone noise reduction algorithm that aims to address this issue is presented in this study. The algorithm uses spatial filtering to estimate the signal-to-noise ratio (SNR) and attenuates time-frequency elements that have poor SNR. The algorithm was evaluated by measuring intelligibility of speech embedded in 4-talker babble where the interfering talkers were spatially separated and changed location during the test. Twelve cochlear implant users took part in the evaluation, which demonstrated a significant mean improvement of 4.6 dB (standard error 0.4, P<0.001) in speech reception threshold compared to an adaptive beamformer. The results suggest that a substantial improvement in performance can be gained for cochlear implant users in noisy environments where the noise is spatially separated from the target speech.en_US
dc.description.sponsorshipThis research was carried out at Cochlear Ltd, Research and Applications Laboratory, Melbourne, and was financially supported in part by the HEARing CRC established and supported under the Australian Government’s Cooperative Research Centre’s program. The Bionics Institute acknowledges the support it receives from the Victorian Government through its Operational Infrastructure Support Program.en_US
dc.identifier.citationHersbach, A., Grayden, D., Fallon, J., & McDermott, H. (2013). A beamformer post-filter for cochlear implant noise reduction. Journal of the Acoustical Society of America, 133(4), 2412- 2420.en_US
dc.identifier.issn1520-8524
dc.identifier.urihttp://repository.bionicsinstitute.org:8080/handle/123456789/24
dc.language.isoenen_US
dc.publisherAcoustical Society of Americaen_US
dc.subjectAcoustic Noiseen_US
dc.subjectAcoustic Signal Processingen_US
dc.subjectArray Signal Processingen_US
dc.subjectCochlear Implantsen_US
dc.subjectSpeech Intelligibilityen_US
dc.titleA beamformer post-filter for cochlear implant noise reductionen_US
dc.typeArticleen_US
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