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Related Experiment Videos

Speech processing for multichannel cochlear implants: variations of the Spectral Maxima Sound Processor strategy

C M McKay1, A E Vandali, H J McDermott

  • 1University of Melbourne, Australia.

Acta Oto-Laryngologica
|January 1, 1994
PubMed
Summary

The Spectral Maxima Sound Processor (SMSP) offers improved speech comprehension. Variations in electrode number and stimulation rate enhance speech perception in background noise for some users.

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Area of Science:

  • Audiology
  • Biomedical Engineering
  • Signal Processing

Background:

  • The Spectral Maxima Sound Processor (SMSP) uses 16 band-pass filters and 16 intracochlear electrodes.
  • Previous studies showed SMSP improves speech comprehension compared to the MULTIPEAK (MSP) processor.
  • A new digital signal processing speech processor enabled investigation of SMSP variations.

Purpose of the Study:

  • To investigate variations of the SMSP strategy for enhanced speech perception.
  • To evaluate the impact of increased pulse rate, variable electrode selection, and spectral peak sharpening.

Main Methods:

  • Tested three SMSP variations: 400 Hz pulse rate, 4-8 active electrodes, and sharpened spectral peaks.
  • Evaluated speech perception in quiet and background noise conditions.

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  • Utilized a new digital signal processing speech processor for flexible programming.

    • Main Results:

    • All variations showed minimal effect on speech perception in quiet.
    • Increasing stimulation rate to 400 Hz improved performance for some subjects in noise.
    • Selecting 8 electrodes for stimulation was also advantageous for some subjects in noisy environments.

    Conclusions:

    • SMSP variations have limited impact in quiet listening conditions.
    • Increased stimulation rate and electrode count can benefit certain users in noisy environments.
    • Further research into optimized SMSP strategies for noisy conditions is warranted.