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Related Experiment Videos

Enhancing temporal cues to voice pitch in continuous interleaved sampling cochlear implants.

Tim Green1, Andrew Faulkner, Stuart Rosen

  • 1Department of Phonetics and Linguistics, University College London, Wolfson House, London NW1 2HE, United Kingdom. tim@phon.ucl.ac.uk

The Journal of the Acoustical Society of America
|November 10, 2004
PubMed
Summary

Cochlear implant users struggle with voice pitch due to limited spectral resolution. Modified processing improved pitch perception by enhancing temporal envelope cues, but benefits were small, indicating limited potential for significant enhancement.

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Area of Science:

  • Auditory Neuroscience
  • Speech Processing
  • Cochlear Implant Technology

Background:

  • Cochlear implant (CI) systems have limited spectral resolution, impairing voice pitch perception.
  • Pitch perception in CI users relies on weak temporal envelope cues.
  • Enhancing these temporal cues is crucial for improving speech understanding in CI users.

Purpose of the Study:

  • To investigate methods for enhancing temporal envelope cues for voice pitch perception.
  • To compare performance between standard and modified processing strategies in CI users and simulations.
  • To identify factors contributing to improved pitch perception with modified processing.

Main Methods:

  • Subjects (CI users and normal listeners) performed pitch perception tasks using synthetic stimuli.

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  • Standard processing used low-pass filtered envelopes (400 Hz).
  • Modified processing combined slow-rate spectral modulations (<32 Hz) with a simplified, periodic waveform (e.g., sawtooth) to match fundamental frequency (F0).

    • Main Results:

    • Modified processing significantly improved pitch perception accuracy in both normal listeners and CI users compared to standard processing.
    • The benefit of modified processing decreased with higher fundamental frequencies (F0).
    • Removing slow-rate spectral dynamics revealed that spectral variations can obscure temporal pitch cues.

    Conclusions:

    • Modified processing, by enhancing temporal envelope cues and using a periodic waveform, offers an advantage for pitch perception.
    • Factors like increased modulation depth and waveform characteristics contribute to clearer F0 representation.
    • Despite improvements, the overall advantage was small, suggesting limitations in developing strategies for substantially enhanced pitch perception in CI users.