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Signal Processing Strategies for Cochlear Implants Using Current Steering

Abstract

In contemporary cochlear implant systems, the audio signal is decomposed into different frequency bands, each assigned to one electrode. Thus, pitch perception is limited by the number of physical electrodes implanted into the cochlea and by the wide bandwidth assigned to each electrode. The Harmony HiResolution bionic ear (Advanced Bionics LLC, Valencia, CA, USA) has the capability of creating virtual spectral channels through simultaneous delivery of current to pairs of adjacent electrodes. By steering the locus of stimulation to sites between the electrodes, additional pitch percepts can be generated. Two new sound processing strategies based on current steering have been designed, SpecRes and SineEx. In a chronic trial, speech intelligibility, pitch perception, and subjective appreciation of sound were compared between the two current steering strategies and standard HiRes strategy in 9 adult Harmony users. There was considerable variability in benefit, and the mean results show similar performance with all three 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., Litvak, L., Edler, B. et al. Signal Processing Strategies for Cochlear Implants Using Current Steering. EURASIP J. Adv. Signal Process. 2009, 531213 (2009). https://doi.org/10.1155/2009/531213

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Keywords

  • Processing Strategy
  • Cochlear Implant
  • Audio Signal
  • Wide Bandwidth
  • Publisher Note