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

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

Risultato della ricerca: Contributo in rivistaArticolo in rivista

16 Citazioni (Scopus)


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.
Lingua originaleEnglish
pagine (da-a)194-204
Numero di pagine11
RivistaCochlear Implants International
Stato di pubblicazionePubblicato - 2011


  • battery life
  • cochlear implant
  • masking
  • speech coding
  • spread of excitation


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