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Subjective and objective evaluation of noise management algorithms.
Heidi Peeters1, Francis Kuk, Chi-chuen Lau
1Widex Office of Research in Clinical Amplification, Widex Hearing Aid Company, USA. hpeeters@widexmail.com
Journal of the American Academy of Audiology
|November 26, 2009
Summary
A commercial hearing aid with an adaptive directional microphone and noise reduction algorithm significantly improved speech understanding in noisy environments. Both features enhanced performance, with the directional microphone showing greater benefits.
Area of Science:
- Audiology
- Speech Science
- Signal Processing
Background:
- Hearing aids aim to improve speech intelligibility in challenging acoustic environments.
- Advanced features like directional microphones and noise reduction algorithms are crucial for hearing aid efficacy.
- Optimizing the Speech Intelligibility Index (SII) is a key strategy for enhancing speech perception.
Purpose of the Study:
- To evaluate the subjective and objective improvements in speech intelligibility in noise provided by a hearing aid.
- To assess the performance of a fully adaptive directional microphone and a noise reduction algorithm.
- To determine the impact of these technologies on the Signal-to-Noise Ratio (SNR) in listening environments.
Main Methods:
- Employed the Hearing in Noise Test (HINT) for objective speech-in-noise assessment.
- Utilized the Acceptable Noise Level (ANL) task for subjective evaluation.
- Recruited eighteen participants with diverse sensorineural hearing loss configurations.
Main Results:
- Both the directional microphone and the noise reduction algorithm demonstrated significant improvements in speech-in-noise performance.
- The directional microphone yielded greater reported benefits compared to the noise reduction algorithm.
- A moderate correlation was observed between HINT and ANL results across all tested conditions.
Conclusions:
- The adaptive directional microphone and SII-based noise reduction algorithm show potential for enhancing SNR in real-world listening situations.
- Both the HINT and ANL are validated tools for assessing the benefits of hearing aid technologies.
- These findings support the use of advanced hearing aid features for improving communication in noise.
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