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Updated: Jun 20, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Simulated phase-locking stimulation: an improved speech processing strategy for cochlear implants.

Jing Chen1, Xihong Wu, Liang Li

  • 1National Key Laboratory on Machine Perception, Speech and Hearing Research Center, Peking University, Beijing, PR China.

ORL; Journal for Oto-Rhino-Laryngology and Its Related Specialties
|August 27, 2009
PubMed
Summary

A new simulated phase-locking stimulation (SPLS) strategy significantly improves Chinese speech recognition in cochlear implant simulations compared to continuous interleaved sampling (CIS). SPLS extracts both phase and amplitude information for better hearing outcomes.

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Area of Science:

  • Audiology
  • Speech Processing
  • Biomedical Engineering

Background:

  • Continuous interleaved sampling (CIS) is a standard cochlear implant strategy.
  • CIS extracts speech envelope but omits phase information.
  • Phase information is crucial for speech perception.

Purpose of the Study:

  • To develop a novel simulated phase-locking stimulation (SPLS) strategy.
  • To extract both phase and amplitude-envelope information from speech signals.
  • To evaluate the efficacy of SPLS compared to CIS for Chinese speech recognition.

Main Methods:

  • Developed the SPLS strategy by detecting zero-crossing times of narrow-band signals.
  • Processed Chinese speech using both SPLS and CIS strategies.
  • Conducted psychophysical experiments with normal-hearing Chinese listeners.

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Main Results:

  • SPLS strategy successfully extracted phase and amplitude-envelope information.
  • Normal-hearing Chinese listeners demonstrated significantly better recognition of SPLS-processed speech.
  • Performance improvement with SPLS was observed across quiet, noise-masking, and speech-masking conditions.

Conclusions:

  • The SPLS strategy offers advantages over CIS for speech processing in cochlear implants.
  • Incorporating SPLS could enhance speech-processing functions for Chinese cochlear implant users.
  • Modulating electrical stimulation intervals with SPLS-extracted phase information may improve device performance.