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Related Experiment Video

Updated: Jun 2, 2026

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Published on: August 4, 2023

A channel-selection criterion for suppressing reverberation in cochlear implants.

Kostas Kokkinakis¹, Oldooz Hazrati, Philipos C Loizou

¹Department of Electrical Engineering, The University of Texas at Dallas, Richardson, Texas 75080, USA.

The Journal of the Acoustical Society of America

|May 17, 2011

Summary

Reverberation significantly impairs speech understanding for cochlear implant (CI) users, decreasing intelligibility exponentially with increased reverberation time. A novel channel-selection strategy effectively suppresses reverberation, substantially improving speech intelligibility for CI listeners.

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Area of Science:

Audiology
Signal Processing
Biomedical Engineering

Background:

Reverberation's impact on cochlear implant (CI) users' speech intelligibility is poorly understood.
Understanding this effect is crucial for developing effective hearing aid strategies.

Purpose of the Study:

To quantify the effect of reverberation on CI users' speech intelligibility.
To evaluate a novel speech coding strategy for reverberation suppression in CI users.

Main Methods:

Experiment 1: Assessed CI users' performance on IEEE sentences in varying reverberation times (0.30-1.0 s).
Experiment 2: Evaluated an offline channel-selection strategy based on signal-to-reverberant ratio (SRR) for reverberation suppression.

Main Results:

Speech intelligibility decreased exponentially with increasing reverberation time for all CI users.
The proposed channel-selection strategy yielded over 60 percentage point gains in speech intelligibility in highly reverberant conditions.
The strategy effectively reduced temporal envelope smearing and self-masking effects.

Conclusions:

Reverberation poses a significant challenge to speech intelligibility in CI users.
The developed channel-selection strategy shows promise for enhancing speech perception in reverberant environments for CI users.