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Feedback reduction system influence on additional gain before feedback and maximum stable gain in open-fitted hearing
Steven C Marcrum1, Erin M Picou2, Christopher Bohr1
1a Department of Otolaryngology , University Hospital Regensburg , Regensburg , Germany.
International Journal of Audiology
|November 6, 2018
Summary
Additional gain before feedback and maximum stable gain in hearing aids vary significantly by manufacturer and individual. Optimizing feedback reduction systems for each patient may improve hearing aid performance and satisfaction.
Area of Science:
- Audiology
- Hearing Instrument Technology
Background:
- Open-fit hearing instruments are widely used.
- Feedback reduction systems are crucial for hearing aid performance.
- Existing data on gain before feedback and maximum stable gain needs updating.
Purpose of the Study:
- To update data on additional gain before feedback (AGBF) and maximum stable gain (MSG) in commercial open-fit hearing instruments.
- To evaluate sound quality ratings with active feedback reduction systems.
Main Methods:
- Six commercial hearing instruments with modern feedback reduction systems were tested.
- Gain measurements were performed on 20 adults with normal hearing.
- Sound quality was rated by 30 adults with normal hearing.
Main Results:
- Mean AGBF (2000-4000 Hz) ranged from 5-16 dB across manufacturers.
- Mean MSG (2000-4000 Hz) ranged from 25-35 dB across manufacturers.
- Individual performance varied within manufacturers; sound quality was independent of feedback reduction algorithm type.
Conclusions:
- AGBF and MSG show significant variation across manufacturers and individual ears.
- Personalized selection of feedback reduction systems may enhance user satisfaction and hearing aid performance.
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