Sparse Nonnegative Matrix Factorization Strategy for Cochlear Implants.
Current cochlear implant (CI) strategies carry speech information via the waveform envelope in frequency subbands. CIs require efficient speech processing to maximize information transfer to the brain, especially in background noise, where the speech envelope is not robust to noise interference. In...
| Publicado en: | Trends in Hearing Vol. 19; pp. 1 - 17 |
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| Autores principales: | , , , , |
| Formato: | Journal Article |
| Publicado: |
Sage Publications Inc.
2015
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=116290900&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 116290900 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 23312165 HCEJ jtl: Trends in Hearing issn: 23312165 maglogo: N pubinfo: dt: 2015 vid: 19 pid: 344 pub: Sage Publications Inc. place: Thousand Oaks, California artinfo: ui: 116290900 10.1177/2331216515616941 116290900 ppf: 1 ppct: 16 formats: tig: atl: Sparse Nonnegative Matrix Factorization Strategy for Cochlear Implants. aug: au: Hongmei Hu Lutman, Mark E. Ewert, Stephan D. Guoping Li Bleeck, Stefan affil: Institute of Sound and Vibration Research, University of Southampton, UK sug: subj: Cochlear Implant Noise Language Processing Speech Intelligibility Adolescence Human Algorithms Male Female Young Adult Adult Auditory Perception Analysis of Variance P-Value Post Hoc Analysis Coding Funding Source Adolescent: 13-18 years Adult: 19-44 years Male Female ab: Current cochlear implant (CI) strategies carry speech information via the waveform envelope in frequency subbands. CIs require efficient speech processing to maximize information transfer to the brain, especially in background noise, where the speech envelope is not robust to noise interference. In such conditions, the envelope, after decomposition into frequency bands, may be enhanced by sparse transformations, such as nonnegative matrix factorization (NMF). Here, a novel CI processing algorithm is described, which works by applying NMF to the envelope matrix (envelopogram) of 22 frequency channels in order to improve performance in noisy environments. It is evaluated for speech in eight-talker babble noise. The critical sparsity constraint parameter was first tuned using objective measures and then evaluated with subjective speech perception experiments for both normal hearing and CI subjects. Results from vocoder simulations with 10 normal hearing subjects showed that the algorithm significantly enhances speech intelligibility with the selected sparsity constraints. Results from eight CI subjects showed no significant overall improvement compared with the standard advanced combination encoder algorithm, but a trend toward improvement of word identification of about 10 percentage points at +15 dB signal-to-noise ratio (SNR) was observed in the eight CI subjects. Additionally, a considerable reduction of the spread of speech perception performance from 40% to 93% for advanced combination encoder to 80% to 100% for the suggested NMF coding strategy was observed. pubtype: Academic Journal doctype: Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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