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The Effect of Adaptive Nonlinear Frequency Compression on Phoneme Perception.
Danielle Glista1, Marianne Hawkins1, Andrea Bohnert2
1Child Amplification Laboratory, National Centre for Audiology, University of Western Ontario, London, Canada.
American Journal of Audiology
|November 10, 2017
Summary
This study found that both adaptive and static nonlinear frequency compression (NFC) in hearing aids improved high-frequency phoneme perception for some users compared to conventional hearing aids. Individual results varied, but group performance showed benefits.
Area of Science:
- Audiology
- Speech-Language Pathology
- Hearing Aid Technology
Background:
- Frequency lowering hearing aids aim to improve speech perception for individuals with high-frequency hearing loss.
- Nonlinear frequency compression (NFC) is a technique used in hearing aids to shift high-frequency sounds to lower, more audible frequencies.
Purpose of the Study:
- To evaluate speech perception with a novel type of frequency lowering using a fitting method across multiple testing sites, participants, and hearing aid conditions.
- To compare the effectiveness of adaptive NFC and static NFC with conventional hearing aid processing.
Main Methods:
- A blinded crossover design with posttrial withdrawal testing was employed.
- Eight participants (children and young adults) underwent real-world hearing aid trials.
- Phoneme perception was assessed using adaptive NFC, static NFC, and conventional processing conditions.
Main Results:
- Both adaptive and static NFC improved group-level detection and recognition of some high-frequency phonemes compared to conventional processing.
- Mean results for phoneme distinction were similar across all tested hearing aid conditions.
- Individual-level results demonstrated variability in speech perception benefits.
Conclusions:
- Both adaptive and static NFC offer similar speech perception benefits compared to conventional hearing aid technology at a group level.
- The study highlights the importance of considering individual performance patterns beyond group averages.
- Findings suggest NFC is a viable strategy for enhancing speech perception in hearing aid users.
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