A practical method of predicting the loudness of complex electrical stimuli
Colette M McKay1, Katherine R Henshall, Rebecca J Farrell
1Department of Otolaryngology, The University of Melbourne, 384-388 Albert Street, East Melbourne 3002, Australia. colette@unimelb.edu.au
This study presents a new method for estimating loudness in cochlear implants (CIs) by analyzing electrical stimulation patterns. The approach accurately predicts loudness perception across different cochlear regions for CI users.
Area of Science:
- Audiology
- Biomedical Engineering
- Signal Processing
Background:
- Cochlear implant (CI) speech processors generate complex electrical stimuli.
- Current CI processors often use sequential biphasic pulses.
- Accurate loudness estimation is crucial for CI sound processing strategies.
Discussion:
- A novel method is presented for calculating loudness estimates from CI electrical stimuli.
- The method incorporates a simplifying assumption regarding temporal integration of current pulses.
- It allows for the estimation of loudness contributions from specific cochlear regions.
Key Insights:
- The proposed loudness model was validated with CI users (CI24M device).
- Loudness growth functions were derived, improving prediction accuracy.
- The method accurately predicted loudness for multi-electrode stimuli with varied patterns.
Outlook:
- This method can refine existing CI processing strategies.
- It offers a tool for developing novel sound processing strategies.
- Potential for improved intensity coding and sound perception in CI users.
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