Clinical evaluation of cochlear implant sound coding taking into account conjectural masking functions, MP3000TM

Efficacy of the SPEAK and ACE coding strategies was compared with that of a new strategy, MP3000TM, 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. DOI: https://doi.org/10.1179/1754762811Y0000000009 Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-53839 Published Version Originally published at: Buechner, A; Beynon, A; Szyfter, W; Niemczyk, K; Hoppe, U; Hey, M; Brokx, J; Eyles, J; Van de Heyning, P; Paludetti, G; Zarowski, A; Quaranta, Q; Wesarg, T; Festen, J; Olze, H; Dhooge, I; MüllerDeile, J; Ramos, A; Roman, S; Piron, J P; Cuda, D; Burdo, S; Grolman, W; Roux Vaillard, S; Huarte, A; Frachet, B; Morera, C; Garcia-Ibáñez, L; Abels, D; Walger, M; Müller-Mazotta, J; Antonio Leone, C; Meyer, B; Dillier, N; Steffens, T; Gentine, A; Mazzoli, M; Rypkema, G; Killian, M; Smoorenburg, G (2011). Clinical evaluation of cochlear implant sound coding taking into account conjectural masking functions, MP3000TM. Cochlear Implants International, 12(4):194-204. DOI: https://doi.org/10.1179/1754762811Y0000000009 Clinical evaluation of cochlear implant sound coding taking into account conjectural masking functions, MP3000TM Andreas Buechner1, Andy Beynon2, Witold Szyfter3, Kazimierz Niemczyk4, Ulrich Hoppe5, Matthias Hey6, Jan Brokx7, Julie Eyles8, Paul Van de Heyning9, Gaetano Paludetti10, Andrzej Zarowski11, Nicola Quaranta12, Thomas Wesarg13, Joost Festen14, Heidi Olze15, Ingeborg Dhooge16, Joachim Müller-Deile17, Angel Ramos18, Stephane Roman19, Jean-Pierre Piron20, Domenico Cuda21, Sandro Burdo22, Wilko Grolman23, Samantha Roux Vaillard24, Alicia Huarte25, Bruno Frachet26, Constantine Morera27, Luis Garcia-Ibáñez28, Daniel Abels29, Martin Walger30, Jochen Müller-Mazotta31, Carlo Antonio Leone32, Bernard Meyer33, Norbert Dillier34, Thomas Steffens35, André Gentine36, Manuela Mazzoli37, Gerben Rypkema38, Matthijs Killian39, Guido Smoorenburg40 Medizinische Hochschule Hannover (MHH), Carl-Neuberg-Str. 1, 30625 Hannover, Germany, UMC st. Radboud Nijmegen, Postbus 9101, 6500 HB Nijmegen, The Netherlands, Department of Otolaryngology Poznan University of Medical Sciences, ul. Przybyszewskiego 49, Poznan, Poland, Department of Otolaryngology, Medical University of Warsaw, ul. Banacha 1a, Warszawa, Poland, Universitätsklinikum Erlangen, Hals-Nasen-Ohren-Klinik, Waldstraße 1, Erlangen, Germany, St. Salvator Krankenhaus, HNO-Klinik, Gleimstrasse 5, 38820 Halberstadt, Germany, Academisch Ziekenhuis Maastricht, P. Debyelaan 25, 6202 AZ Maastricht, The Netherlands, SOECIC, Institute of Sound and Vibration Research, University of Southampton, SO17 1BJ Southampton, United Kingdom, Universitair Ziekenhuis Antwerpen, Wilrijkstraat 10, 2650 Edegem, Belgium, Istituto di Clinica Otorinolaringoiatrica, Policlinico Universitario “Agostino Gemelli”, L.go A. Gemelli, 8, 00168 Roma, Italy, Medisch Instituut St. Augustinus, Oosterveldlaan 24, 2610 Wilrijk, Belgium, Ospedale Policlinico Consorziale, P.zza G. Cesare, 11, 70124 Bari, Italy, Klinikum der Albert-LudwigsUniversitaet, Universitaetsklinik fuer Hals-, Nasenund Ohrenheilkunde und Poliklinik, Killianstrasse 5, 79106 Freiburg, Germany, VUMC Amsterdam, De Boelelaan 1117, 1007 MB Amsterdam, The Netherlands, Charitè Campus Virchow Klinikum, HNO Klinik und Poliklinik, Augustenburger Platz 1, Berlin, Germany, Universitair ziekenhuis Gent, De Pintelaan 185, 9000 Gent, Belgium, Universitätsklinikum Schleswig-Holstein, Klinik fuer Hals-, Nasen, Ohrenheilkunde, Kopfund Halschirurgie, Arnold-Heller-Strasse 14, 24105 Kiel, Germany, Hospital Insular de Gran Canaria/Materno Infantil, Servicio de Audiologia, Avda.Maritima del Sur, S/N 35016 Las Palmas de Gran Canaria, Spain, CHU La Timone Children Hospital, Rue Saint Pierre 264, 13385 Marseille Cedex 5, France, Hôpital Gui de Chauliac, Service ORL, 80, avenue Augustin, Fliche 34295 Montpellier Cedex 5, France, Ospedale Guglielmo da Saliceto, Via Taverna 49, 29100 Piacenza, Italy, Ospedale di Circolo e Fondazione Macchi, Viale Luigi Borri 57, 21100 Varese, Italy, AMC Amsterdam, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands, CHU Angers, 4 rue Larrey, 49033 Angers, France, Clinica Universitaria de Navarra, Avda. Pío XII 36, 31008 Pamplona, Spain, Hôpital Avicenne, Service ORL, 125 route de Stalingrad, Bobigny Cédex, France, Servicio de Otorrinolaringologia University Hospital “La Fe” of Valencia, Avda. Campanar, 21, 46009 Valencia, Spain, Otology Institute García-Ibáñez, Dr. Roux 91, 8017 Barcelona, Spain, Uniklinik und Poliklinik fuer HNO-Krankheiten, Petersgraben 4, 4031 Basel, Switzerland, HNOUniversitätsklinik Köln, Audiologie und Pädaudiologie, Kerpenerstr.62, Köln, Germany, Philipps-Universität Marburg, Klinik u. Poliklinik f. HNO-Heilkunde, Deutschhausstraße 3, 35037 Marburg, Germany, U.O.C. di O.R.L, A.O. Monaldi Napoli, Azienda di Rilievo Nazionale e di Alta Specializzazione, Via L. Bianchi, 80131 Napoli, Italy, Hôpital Saint Antoine, 184 rue du faubourg Saint Antoine, 75012 Paris, France, Correspondence to: G Smoorenburg. Email: [email protected] © W.S. Maney & Son Ltd 2011 MORE OpenChoice articles are open access and distributed under the terms of the Creative Commons Attribution License 3.0 DOI 10.1179/1754762811Y0000000009 Cochlear Implants International 2011 VOL. 12 NO. 4 194 P ub lis he d by M an ey P ub lis hi ng ( c) W . S . M an ey & S on L im ite d Universitätsspital, ORL Klinik, Frauenklinikstrs 24, 8091 Zuerich, Switzerland, Universitätsklinikum Regensburg, HNO-Klinik, Franz-Josef-Strauß-Allee 11, 93053 Regensburg, Germany, Hôpital Hautepierre, Service ORL, Avenue Molière, 67098 Strasbourg Cedex, France, Azienda ospedaliera di Padova, Via Giustiniani 2, 35128 Padova, Italy, Cochlear Europe, Cochlear Europe, “La Palladienne”, Plan Peyrassou, 83890 Besse sur Issole, France Efficacy of the SPEAK and ACE coding strategies was compared with that of a new strategy, MP3000TM, 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.