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Evaluation of an adaptive beamforming method for hearing aids
1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge 02139.
The Journal of the Acoustical Society of America
|March 1, 1992
Summary
This study enhances hearing aid adaptive beamforming systems to improve speech clarity. Modified algorithms reduce signal interference, offering better performance with specific microphone configurations in quiet environments.
Area of Science:
- Acoustics
- Signal Processing
- Hearing Aid Technology
Background:
- Hearing aids utilize adaptive beamforming to isolate target sounds from background noise.
- Existing systems face challenges like target cancellation and misadjustment with strong signals.
Purpose of the Study:
- To evaluate a two-microphone adaptive beamforming system for hearing aids.
- To propose and assess modifications to the Griffiths-Jim algorithm for improved performance.
Main Methods:
- Utilized computer simulations and real-time hardware implementation.
- Evaluated performance based on spectrally weighted gain in target-to-jammer ratio.
- Focused on a single jammer scenario.
Main Results:
- Modified algorithms improved performance with misaligned arrays and high target-to-jammer ratios in low reverberation.
- A 7-cm broadside array configuration outperformed other tested configurations.
- Performance degraded in reverberant conditions, with limited improvement at room's critical distance.
Conclusions:
- The proposed modifications enhance adaptive beamforming for hearing aids, particularly in less reverberant settings.
- Optimal microphone array configuration is crucial for effective noise reduction.
- Further research is needed for robust performance in highly reverberant environments.