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The factor analysis of speech: limitations and opportunities for cochlear implants

Grange, Jacques and Culling, John 2018. The factor analysis of speech: limitations and opportunities for cochlear implants. Acta Acustica united with Acustica 104 (5) , pp. 835-838. 10.3813/AAA.919253

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Current spread is known to limit the number of independent spectral channels in cochlear implants. The outcome of an experiment employing cochlear implant simulations indicated that current spread is not the only limitation on the benefit of increasing the number of electrodes: for both sentences and digit triplets, improvements in speech reception threshold slowed markedly once more than seven electrodes/processing channels were simulated. Factor analysis of speech envelopes from the output of an auditory filterbank confirmed that speech contains 6-8 independent sources of information, causing finer spectral filtering to produce redundant information in adjacent channels. It is possible that factor analysis can be used to refine the frequency maps used in cochlear implants in order to minimise the effects of current spread.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Publisher: Hirzel Verlag (S. Hirzel Verlag)
ISSN: 1610-1928
Date of First Compliant Deposit: 10 October 2018
Date of Acceptance: 10 July 2018
Last Modified: 13 Aug 2019 15:37

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