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A Psychoacoustic "NofM"-Type Speech Coding Strategy for Cochlear Implants

Abstract

We describe a new signal processing technique for cochlear implants using a psychoacoustic-masking model. The technique is based on the principle of a so-called "NofM" strategy. These strategies stimulate fewer channels () per cycle than active electrodes (NofM;). In "NofM" strategies such as ACE or SPEAK, only the channels with higher amplitudes are stimulated. The new strategy is based on the ACE strategy but uses a psychoacoustic-masking model in order to determine the essential components of any given audio signal. This new strategy was tested on device users in an acute study, with either 4 or 8 channels stimulated per cycle. For the first condition (4 channels), the mean improvement over the ACE strategy was. For the second condition (8 channels), no significant difference was found between the two strategies.

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Correspondence to Waldo Nogueira.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License ( https://creativecommons.org/licenses/by/2.0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Nogueira, W., Büchner, A., Lenarz, T. et al. A Psychoacoustic "NofM"-Type Speech Coding Strategy for Cochlear Implants. EURASIP J. Adv. Signal Process. 2005, 101672 (2005). https://doi.org/10.1155/ASP.2005.3044

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Keywords and phrases:

  • cochlear implant
  • NofM
  • ACE
  • speech coding
  • psychoacoustic model
  • masking