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Related Experiment Video

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Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process

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Published on: June 21, 2024

Using a reflection model for modeling the dynamic feedback path of digital hearing aids.

Guilin Ma¹, Fredrik Gran, Finn Jacobsen

¹Research Group, GN ReSound A/S, Lautrupbjerg 9, 2750 Ballerup, Denmark. gm@elektro.dtu.dk

The Journal of the Acoustical Society of America

|March 25, 2010

Summary

This study models dynamic feedback paths in digital hearing aids, improving accuracy and stability. The reflection model offers better performance than existing methods, though complex environments present challenges for dual-microphone hearing aids.

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Published on: November 26, 2012

Area of Science:

Audiology
Acoustics
Signal Processing

Background:

Hearing aid feedback whistling is a significant issue, particularly during dynamic user activities.
Understanding and modeling dynamic feedback paths is crucial for hearing aid performance.

Purpose of the Study:

To investigate the properties of dynamic feedback paths in digital hearing aids.
To propose and validate a novel reflection-based model for dynamic feedback paths.
To assess the extension of this model to dual-microphone hearing aid systems.

Main Methods:

Measurement of dynamic feedback paths in digital hearing aids.
Development of a reflection-based feedback path model.
Comparison of the proposed model against direct and initialization models using mean-square error and maximum stable gain.
Extension of the model to dual-microphone configurations.

Main Results:

The proposed reflection model demonstrates superior efficiency and accuracy in modeling dynamic feedback paths compared to existing models.
The model effectively reduces mean-square error and increases maximum stable gain.
Application to dual-microphone hearing aids revealed intricate path relationships in complex acoustic environments, limiting immediate benefits.

Conclusions:

The reflection-based model provides a more accurate and efficient approach to characterizing dynamic feedback paths in hearing aids.
While promising, the complexity of acoustic environments in dual-microphone systems requires further investigation for effective feedback path modeling.
Future research should focus on advanced techniques to exploit inter-microphone feedback path relationships in challenging scenarios.