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Matching pursuit for channel selection in cochlear implants based on an intelligibility metric
KTH, School of Electrical Engineering (EES), Sound and Image Processing.
2012 (English)In: 2012 Proceedings Of The 20th European Signal Processing Conference (EUSIPCO), IEEE Computer Society, 2012, 504-508 p.Conference paper (Refereed)
Abstract [en]

In this paper the earlier proposed short-time objective intelligibility predictor (STOI) is simplified such that it can be expressed as a weighted ℓ2 norm in the auditory domain. Due to the mathematical properties of a norm, STOI can now be used with the matching pursuit algorithm in the n-of-m channel selection technique as found in several cochlear implant (CI) coding strategies. With this technique only a subset of frequency channels (electrodes) are stimulated, such that important channels can be updated more frequently and less significant channels are omitted. Intelligibility predictions with acoustic CI-simulations for normal-hearing listeners indicate that more intelligible speech is obtained with the proposed method compared to a conventional channel selection method based on peak picking. Reasons for this difference in performance are: (1) STOI considers an analysis window of a few hundreds of milliseconds in order to account for important low temporal modulations for speech intelligibility and (2) spectral leakage per channel is accounted for in the mathematical optimization process.

Place, publisher, year, edition, pages
IEEE Computer Society, 2012. 504-508 p.
, European Signal Processing Conference, ISSN 2219-5491
Keyword [en]
Speech intelligibility metric, matching pursuit, cochlear implants, channel selection
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-107991ISI: 000310623800102ScopusID: 2-s2.0-84869826887ISBN: 978-146731068-0OAI: diva2:578865
20th European Signal Processing Conference, EUSIPCO 2012, 27 August 2012 through 31 August 2012, Bucharest

QC 20121219

Available from: 2012-12-19 Created: 2012-12-19 Last updated: 2013-01-14Bibliographically approved

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Taal, Cees H.
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