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Relationship between in-situ distortion and hearing aid benefit
1Memphis Speech and Hearing Center, University of Memphis, Tennessee.
Journal of the American Academy of Audiology
|September 1, 1994
Summary
This study found that in-ear hearing aid distortion, particularly harmonic distortion, is linked to user benefit in noisy and reverberant environments. Measuring this distortion could improve hearing aid evaluations.
Area of Science:
- Audiology
- Acoustics
- Hearing Science
Background:
- In-situ hearing aid distortion measurement is crucial for understanding real-world performance.
- Contemporary hearing aids require evaluation under realistic listening conditions.
Purpose of the Study:
- To investigate the relationship between in-situ distortion and hearing aid benefit.
- To identify which types of distortion best predict user benefit.
Main Methods:
- Simulated in-situ distortion (intermodulation, harmonic, transient) was measured for 97 hearing aid fittings.
- Measurements were conducted in simulated living room, classroom, and social event environments.
- Data were analyzed using between- and within-subject analyses.
Main Results:
- A significant relationship was found between distortion and benefit in noisy and reverberant environments.
- In-situ harmonic distortion showed the strongest correlation with benefit.
- Other distortion types did not significantly contribute to benefit prediction.
Conclusions:
- In-situ harmonic distortion measurement may enhance hearing aid evaluations.
- Understanding distortion in realistic listening conditions is key to optimizing hearing aid benefit.