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

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...

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Published in:	Cochlear implants international Vol. 12; no. 4; pp. 194 - 204
Main Authors:	Buechner, 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, Ingeborg, 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, Rypkema, Gerben, Killian, Matthijs, Smoorenburg, Guido
Format:	Journal Article
Language:	English
Published:	England Taylor & Francis 01-11-2011 Maney Publishing
Subjects:	Acoustic Stimulation - instrumentation Adolescent Adult Aged Aged, 80 and over Battery life Child Cochlear implant Cochlear Implantation - instrumentation Cochlear Implants Electronics Equipment Design Female Humans Male Masking Middle Aged Perceptual Masking Psychophysics Signal Processing, Computer-Assisted - instrumentation Spectrum Analysis Speech Acoustics Speech coding Spread of excitation Telemetry - methods Young Adult
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Summary:	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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1467-0100 1754-7628
DOI:	10.1179/1754762811Y0000000009