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Related Experiment Video

Updated: Jul 10, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
06:04

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

Loudness normalization for cochlear implant using pulse-rate modulation to convey Mandarin tonal information: a

Fei Chen1, Yuan-ting Zhang

  • 1Shun Hing Institute of Advanced Engineering, Chinese University of Hong Kong, Hong Kong.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|October 20, 2007
PubMed
Summary

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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...

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Cochlear implants (CI) can improve hearing by modulating pulse-rate for tonal languages. A new amplitude compensation scheme normalizes loudness perception, enhancing speech understanding for Mandarin speakers using CIs.

Area of Science:

  • Auditory Neuroscience
  • Biomedical Engineering
  • Speech Processing

Background:

  • Cochlear implant (CI) devices use electrical pulsatile stimulation of auditory nerves (AN) to restore hearing.
  • Modulating pulse-rate in CIs can improve speech perception for tonal language speakers, like Mandarin.
  • However, pulse-rate modulation causes unwanted loudness variations.

Purpose of the Study:

  • To introduce an amplitude compensation scheme for CI users.
  • To normalize loudness perception during pulse-rate modulation for Mandarin tonal information.
  • To maintain efficient tonal information transmission.

Main Methods:

  • Implemented an integrate-and-fire auditory nerve (AN) model.
  • Developed loudness and pitch perception models.

Related Experiment Videos

Last Updated: Jul 10, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
06:04

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

  • Conducted model-based simulations.

    • Main Results:

    • The proposed amplitude compensation scheme normalized perceived loudness.
    • Mandarin tonal information was efficiently transmitted with the compensation scheme.
    • Simulations confirmed loudness normalization and effective tonal information transfer.

    Conclusions:

    • The amplitude compensation scheme effectively normalizes loudness in CI stimulation.
    • Integrating this scheme with current CIs can enhance speech identification for Mandarin speakers.
    • This approach offers improved auditory perception for CI users of tonal languages.