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Clinical evaluation of cochlear implant sound coding taking into account conjectural masking functions, MP3000™

Beuchner, Andreas, Beynon, Andy, Szyfter, Witold, Niemczyk, Kazimierz, Hoppe, Ulrich, Hey, Matthias, Brokx, Jan, Eyles, Julie, Van de Heyning, Paul, Paludetti, Gaetano, Zarowski, Andrzej, Quaranta, Nicola, Wesarg, Thomas, Festen, Joost, Olze, Heidi, Dhooge, Ingeboorg, Müller-Deile, Joachim, Ramos, Angel, Roman, Stephane, Piron, Jean-Pierre, Cuda, Domenico, Burdo, Sandro, Grolman, Wilko, Vaillard, Samantha Roux, Huarte, Alicia, Frachet, Bruno, Morera, Constantine, Garcia-Ibáñez, Luis, Abels, Daniel, Walger, Martin, Müller-Mazotta, Jochen, Leone, Carlo Antonio, Meyer, Bernard, Dillier, Norbert, Steffens, Thomas, Gentine, André, Mazzoli, Manuela, Gerben, Rypkema, Killian, Matthijs and Smoorenburg, Guido (2011) Clinical evaluation of cochlear implant sound coding taking into account conjectural masking functions, MP3000™ Cochlear Implants International, 12, (4), pp. 194-204. (doi:10.1179/1754762811Y0000000009). (PMID:PMC3175094 ).

Record type: Article


Efficacy of the SPEAK and ACE coding strategies was compared with that of a new strategy, MP3000™, by 37 European implant centers including 221 subjects. The SPEAK and ACE strategies are based on selection of 8-10 spectral components with the highest levels, while MP3000 is based on the selection of only 4-6 components, with the highest levels relative to an estimate of the spread of masking. The pulse rate per component was fixed. No significant difference was found for the speech scores and for coding preference between the SPEAK/ACE and MP3000 strategies. Battery life was 24% longer for the MP3000 strategy. With MP3000 the best results were found for a selection of six components. In addition, the best results were found for a masking function with a low-frequency slope of 50 dB/Bark and a high-frequency slope of 37 dB/Bark (50/37) as compared to the other combinations examined of 40/30 and 20/15 dB/Bark. The best results found for the steepest slopes do not seem to agree with current estimates of the spread of masking in electrical stimulation. Future research might reveal if performance with respect to SPEAK/ACE can be enhanced by increasing the number of channels in MP3000 beyond 4-6 and it should shed more light on the optimum steepness of the slopes of the masking functions applied in MP3000.

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Published date: November 2011
Keywords: spread of excitation, battery life, masking, speech coding, cochlear implant
Organisations: Human Sciences Group


Local EPrints ID: 200095
ISSN: 1467-0100
PURE UUID: a2f4a8c9-4209-42b2-9cb0-ed56dc71acc7

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Date deposited: 21 Oct 2011 12:25
Last modified: 18 Jul 2017 11:14

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Author: Andreas Beuchner
Author: Andy Beynon
Author: Witold Szyfter
Author: Kazimierz Niemczyk
Author: Ulrich Hoppe
Author: Matthias Hey
Author: Jan Brokx
Author: Julie Eyles
Author: Paul Van de Heyning
Author: Gaetano Paludetti
Author: Andrzej Zarowski
Author: Nicola Quaranta
Author: Thomas Wesarg
Author: Joost Festen
Author: Heidi Olze
Author: Ingeboorg Dhooge
Author: Joachim Müller-Deile
Author: Angel Ramos
Author: Stephane Roman
Author: Jean-Pierre Piron
Author: Domenico Cuda
Author: Sandro Burdo
Author: Wilko Grolman
Author: Samantha Roux Vaillard
Author: Alicia Huarte
Author: Bruno Frachet
Author: Constantine Morera
Author: Luis Garcia-Ibáñez
Author: Daniel Abels
Author: Martin Walger
Author: Jochen Müller-Mazotta
Author: Carlo Antonio Leone
Author: Bernard Meyer
Author: Norbert Dillier
Author: Thomas Steffens
Author: André Gentine
Author: Manuela Mazzoli
Author: Rypkema Gerben
Author: Matthijs Killian
Author: Guido Smoorenburg

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