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Spectral density affects the intelligibility of tone-vocoded speech: Implications for cochlear implant simulations

Rosen, S; Zhang, Y; Speers, K; (2015) Spectral density affects the intelligibility of tone-vocoded speech: Implications for cochlear implant simulations. The Journal of the Acoustical Society of America , 138 (3) EL318-EL323. 10.1121/1.4929618. Green open access

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Abstract

For small numbers of channels, tone vocoders using low envelope cutoff frequencies are less intelligible than noise vocoders, even though the noise carriers introduce random fluctuations into the crucial envelope information. Here it is shown that using tone carriers with a denser spectrum improves performance considerably over typical tone vocoders, at least equalling, and often surpassing, the performance possible with noise vocoders. In short, the spectral sparseness of tone vocoded sounds for low channel numbers, separate from the degradations introduced by using only a small number of channels, is an important limitation on the intelligibility of tone-vocoded speech.

Type: Article
Title: Spectral density affects the intelligibility of tone-vocoded speech: Implications for cochlear implant simulations
Open access status: An open access version is available from UCL Discovery
DOI: 10.1121/1.4929618
Publisher version: http://dx.doi.org/10.1121/1.4929618
Language: English
Additional information: Copyright 2015 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > Speech, Hearing and Phonetic Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1472697
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