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Directional Microphone Hearing Aids in School Environments: Working Toward Optimization.

Todd A Ricketts1, Erin M Picou1, Jason Galster2

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Children with hearing loss often struggle to manually optimize hearing aid microphone settings for the best sound quality. Automatic settings showed fair agreement, suggesting improvements are needed for classroom listening environments.

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Area of Science:

  • Audiology
  • Speech and Hearing Sciences
  • Assistive Listening Devices

Background:

  • Hearing aid microphone settings, including omnidirectional and directional options, can be manually or automatically adjusted.
  • Optimizing the signal-to-noise ratio (SNR) is crucial for effective communication in challenging acoustic environments like classrooms.

Purpose of the Study:

  • To evaluate the effectiveness of manual versus automatic hearing aid microphone settings in achieving optimal SNR for children in school settings.
  • To determine the percentage of time each setting method provided the best SNR for target talkers.

Main Methods:

  • 26 children (aged 6-17) with hearing loss participated, wearing study hearing aids over two school days.
  • Hearing aid settings were logged and compared against observer judgments of the optimal microphone setting for SNR based on the listening environment.

Main Results:

  • Children rarely manually switched to the optimal microphone setting, even with training.
  • Agreement between observer judgments and automatic switching algorithm selections was only fair.
  • Discrepancies occurred when the algorithm selected directional settings inappropriately or omnidirectional settings in low noise.

Conclusions:

  • Current automatic hearing aid microphone settings may not consistently optimize SNR in classrooms.
  • Factors such as listener preference, talker location, and ambient noise levels need to be considered for improved performance.
  • Further research is needed to refine algorithms for better real-world application in pediatric hearing aid users.