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The peak height insertion gain (PHIG) method for quantifying acoustic feedback in hearing aids.
Joshua M Alexander1, Stephanie Schmig1, Randall P Wagner2
1Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, Indiana 47907, USA.
The Journal of the Acoustical Society of America
|October 2, 2021
Summary
A new Peak Height Insertion Gain (PHIG) method effectively detects hearing aid feedback spikes. This method improves device fitting and expands the usable gain range for better audibility.
Area of Science:
- Audiology
- Acoustics
- Signal Processing
Background:
- Hearing aid fittings with open ear canals risk acoustic feedback.
- Acoustic feedback limits the fitting range and usable gain of hearing aids.
Purpose of the Study:
- To develop and validate a method for detecting feedback spikes in hearing aids.
- To guide clinical decisions and optimize hearing aid selection.
Main Methods:
- Developed the Peak Height Insertion Gain (PHIG) method using audio recordings from a manikin with seven hearing aids.
- Systematically varied hearing aid programming to create feedback.
- Optimized PHIG parameters using expert subjective ratings of feedback.
Main Results:
- The PHIG method demonstrated high sensitivity (0.95) when combining global and local analyses.
- A single-measurement version of the PHIG method achieved comparable performance.
- The method effectively detects feedback spikes in hearing aid gain measurements.
Conclusions:
- The PHIG method is a sensitive and specific tool for detecting acoustic feedback in hearing aids.
- A simplified, single-measurement PHIG approach is clinically feasible.
- This method can improve hearing aid fitting accuracy and performance.
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