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[Asynchronous sequential stimulation. A new signal treatment for cochlear implants]

V Pean1, M Ouayoun, J Genin

  • 1Laboratoire de Recherches ORL, Centre Hospitalo-Universitaire Paris Saint-Antoine.

Annales D'Oto-Laryngologie Et De Chirurgie Cervico Faciale : Bulletin De La Societe D'Oto-Laryngologie Des Hopitaux De Paris
|January 1, 1997
PubMed
Summary
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Cochlear implants can now adapt their processing speed based on speech sounds using a new Asynchronous-Interleaved-Stimulation (AIS) strategy. This improves speech discrimination for users compared to fixed processing methods.

Area of Science:

  • Audiology
  • Signal Processing
  • Biomedical Engineering

Context:

  • Cochlear implants traditionally use fixed or frequency-dependent stimulation rates.
  • Current methods analyze speech signals (vowels, consonants) with fixed filters or Fast Fourier Transform (FFT).
  • This limits adaptability to the dynamic nature of speech.

Purpose:

  • To introduce a novel speech processing strategy for cochlear implants.
  • To dynamically adjust signal analysis based on the input signal's characteristics.
  • To enhance speech perception in cochlear implant users.

Summary:

  • A new Asynchronous-Interleaved-Stimulation (AIS) strategy uses FFT with a variable analysis window.
  • Short windows capture transient speech parts for good time resolution; long windows capture stationary parts for frequency resolution.

Related Experiment Videos

  • Transient signal detection triggers window switching and increased stimulation frequency, improving temporal tracking.

    • Impact:

    • The AIS strategy was implemented in Digisonic cochlear implant software and tested on 6 users.
    • Clinical assessment using consonant-vowel-consonant tests showed improved speech discrimination compared to fixed window FFT analysis.
    • This adaptive approach offers better performance for cochlear implant users.