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A Signal Processing Scheme for Output Limitation.
Ruth A Bentler1, Chaslav V Pavlovic1, Paul J Abbas1
1Department of Speech Pathology and Audiology, University of Iowa, Iowa City, Iowa, USA.
Acta Oto-Laryngologica
|January 8, 2020
Summary
Discomfort summation (S) increases with more complex stimuli for both normal and hearing-impaired listeners. This finding can inform digital hearing aid maximum output levels (MPO) for better sound quality.
Area of Science:
- Audiology
- Psychoacoustics
- Hearing Science
Background:
- Sensory-neural hearing impairment, often due to presbycusis, affects sound perception.
- Complex auditory stimuli can lead to a summation of discomfort (S) in listeners.
- Existing models do not fully explain how increased stimulus complexity impacts perceived discomfort.
Purpose of the Study:
- To quantify the relationship between stimulus complexity and discomfort summation in normal and hearing-impaired listeners.
- To determine if this relationship differs between listener groups.
- To explore the implications of these findings for digital hearing aid design.
Main Methods:
- Participants included normal-hearing individuals and those with mild to moderate sensory-neural hearing loss.
- Listeners were presented with complex auditory stimuli varying in the number of components or bandwidth.
- Regression analysis was used to model the summation of discomfort (S) as a function of stimulus complexity (n).
Main Results:
- A significant positive correlation was found between stimulus complexity and discomfort summation for both groups.
- Regression equations revealed significant differences in discomfort summation between normal and hearing-impaired listeners (S=2.05+11.51 log n vs. S=3.95+12.88 log n).
- The observed changes in perception were not adequately explained by stimulus power or amplitude peak density alone.
Conclusions:
- Discomfort summation is a quantifiable phenomenon influenced by stimulus complexity in hearing.
- Hearing-impaired listeners exhibit a different pattern of discomfort summation compared to normal listeners.
- The derived regression equations offer a basis for optimizing maximum output levels (MPO) in digital hearing aids to enhance listener comfort.
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