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Digital speech processing for cochlear implants.

N Dillier1, H Bögli, T Spillmann

  • 1Department of Otorhinolaryngology, University Hospital, Zürich, Switzerland.

ORL; Journal for Oto-Rhino-Laryngology and Its Related Specialties
|January 1, 1992
PubMed
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New cochlear implant signal processing strategies significantly improved consonant identification for users. Continuous interleaved sampling (CIS) outperformed pitch-excited sampling (PES), highlighting advancements in auditory perception technology.

Area of Science:

  • Biomedical Engineering
  • Auditory Neuroscience
  • Signal Processing

Background:

  • Cochlear implant research focuses on optimizing signal processing to enhance auditory perception.
  • Effective signal processing transforms sound information into electrical stimulation parameters for distinct listener perceptions.

Purpose of the Study:

  • To implement and evaluate novel digital signal processing strategies for the Nucleus 22-electrode cochlear implant system.
  • To compare the performance of pitch-excited sampler (PES) and continuous interleaved sampler (CIS) strategies.

Main Methods:

  • Developed and tested two new digital processing strategies: PES and CIS.
  • Utilized a laboratory cochlear implant speech processor for the Nucleus 22-electrode system.
  • Conducted evaluation experiments with five cochlear implant users, assessing consonant and vowel identification.

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Main Results:

  • Both new strategies significantly improved consonant identification compared to subjects' existing processors.
  • Continuous interleaved sampling (CIS) demonstrated superior performance over pitch-excited sampling (PES).
  • Improvements in vowel identification were minimal across the tested strategies.

Conclusions:

  • Advanced digital signal processing, particularly CIS, enhances speech perception in cochlear implant users.
  • Optimizing signal processing is crucial for improving auditory feedback and intelligibility.
  • Further research may refine parameters for even greater gains in auditory perception.