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

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Abstract
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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Chicago
Buechner, Andreas, Andy Beynon, Witold Szyfter, Kazimierz Niemczyk, Ulirch Hoppe, Matthias Hey, Jan Brokx, et al. 2011. “Clinical Evaluation of Cochlear Implant Sound Coding Taking into Account Conjectural Masking Functions, MP3000TM.” Cochlear Implants International 12 (4): 194–201.
APA
Buechner, A., Beynon, A., Szyfter, W., Niemczyk, K., Hoppe, U., Hey, M., Brokx, J., et al. (2011). Clinical evaluation of cochlear implant sound coding taking into account conjectural masking functions, MP3000TM. COCHLEAR IMPLANTS INTERNATIONAL, 12(4), 194–201.
Vancouver
1.
Buechner A, Beynon A, Szyfter W, Niemczyk K, Hoppe U, Hey M, et al. Clinical evaluation of cochlear implant sound coding taking into account conjectural masking functions, MP3000TM. COCHLEAR IMPLANTS INTERNATIONAL. 2011;12(4):194–201.
MLA
Buechner, Andreas, Andy Beynon, Witold Szyfter, et al. “Clinical Evaluation of Cochlear Implant Sound Coding Taking into Account Conjectural Masking Functions, MP3000TM.” COCHLEAR IMPLANTS INTERNATIONAL 12.4 (2011): 194–201. Print.
@article{4293282,
  abstract     = {Efficacy of the SPEAK and ACE coding strategies was compared with that of a new strategy, MP3000{\texttrademark}, 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.},
  author       = {Buechner, Andreas and Beynon, Andy and Szyfter, Witold and Niemczyk, Kazimierz and Hoppe, Ulirch and Hey, Matthias and Brokx, Jan and Eyles, Julie and Van de Heyning, Paul and Paludetti, Gaetano and Zarowski, Andrzej and Quaranta, Nicola and Wesarg, Thomas and Festen, Joost and Olze, Heidi and Dhooge, Ingeborg and M{\"u}ller-Deile, Joachim and Ramos, Angel and Roman, Stephane and Piron, Jean-Pierre and Cuda, Domenico and Burdo, Sandro and Grolman, Wilko and Roux Vaillard, Samantha and Huarte, Alicia and Frachet, Bruno and Morera, Constantine and Garcia-Ib{\'a}{\~n}ez, Luis and Abels, Daniel and Walger, Martin and M{\"u}ller-Mazotta, Jochen and Leone , Carlo Antonio and Meyer, Bernard and Dillier, Norbert and Steffens, Thomas and Gentine, Andr{\'e} and Mazzoli, Manuela and Rypkema, Gerben and Killian, Matthijs and Smoorenburg, Guido},
  issn         = {1467-0100},
  journal      = {COCHLEAR IMPLANTS INTERNATIONAL},
  language     = {eng},
  number       = {4},
  pages        = {194--201},
  title        = {Clinical evaluation of cochlear implant sound coding taking into account conjectural masking functions, MP3000{\texttrademark}},
  url          = {http://dx.doi.org/10.1179/1754762811Y0000000009},
  volume       = {12},
  year         = {2011},
}

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