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Comparison of Performance for Cochlear-Implant Listeners Using Audio Processing Strategies Based on Short-Time Fast

Yue Zhang1, Peter T Johannesen2,3, Behnam Molaee-Ardekani1

  • 1Department of Research and Technology, Oticon Medical, Vallauris, France.

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|December 16, 2024
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Summary
This summary is machine-generated.

The experimental spectral feature extraction (SFE) cochlear implant (CI) strategy showed similar performance to the conventional Crystalis strategy. Longer acclimatization may be needed for SFE to demonstrate its full potential in CI users.

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Area of Science:

  • Audiology
  • Biomedical Engineering
  • Signal Processing

Background:

  • Conventional cochlear implant (CI) audio processing, like Crystalis, uses short-time fast-Fourier transform (STFT), which has limitations.
  • An experimental strategy, spectral feature extraction (SFE), aims to overcome STFT constraints by directly mapping salient spectral features to CI electrodes.

Purpose of the Study:

  • To compare the sound quality and performance of the experimental SFE strategy against the conventional Crystalis strategy in CI users.
  • To investigate if SFE offers greater benefits for CI users with reduced neural cross-channel interactions.

Main Methods:

  • A double-blind study involving 6 Oticon Medical Digisonic SP CI users.
  • Evaluation of word recognition, speech-in-noise reception threshold (SRT), consonant discrimination, listening effort (pupil dilation), melody contour identification (MCI), and subjective sound quality (MUSHRA).
  • Assessment of neural cross-channel interaction using forward masking.

Main Results:

  • Word recognition and SRTs showed initial differences but became comparable after acclimatization, with Crystalis showing greater improvement.
  • Consonant discrimination was superior with Crystalis.
  • Melody contour identification and listening effort did not differ significantly between strategies.
  • Subjective sound quality was rated lower for SFE than Crystalis.
  • Performance differences between SFE and Crystalis were more pronounced in users with higher channel interaction.

Conclusions:

  • Current CI user performance was similar between the SFE and Crystalis strategies.
  • The experimental SFE strategy may require longer acclimatization periods to realize its full potential.