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Evaluating hearing aid amplification using idiosyncratic consonant errors.

Ali Abavisani1, Jont B Allen1

  • 1Department of Electrical and Computer Engineering, The Beckman Institute, University of Illinois at Urbana-Champaign, 405 North Mathews Avenue, Urbana, Illinois 61801, USA.

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This study introduces a new metric for hearing aid fitting, using consonant recognition to evaluate insertion gain. The method helps audiologists fine-tune hearing aids to improve speech perception for individuals.

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Area of Science:

  • Audiology
  • Speech Perception
  • Hearing Aid Technology

Background:

  • Hearing aid fitting aims to optimize speech perception.
  • Current methods for evaluating insertion gain may not fully capture individual speech recognition nuances.
  • Fine-tuning hearing aids is crucial for maximizing patient benefit.

Purpose of the Study:

  • To develop a metric for evaluating hearing aid insertion gain based on consonant recognition.
  • To assess the impact of a specific treatment gain on phone recognition compared to a flat gain.
  • To identify when hearing aid gain adjustments may degrade speech perception.

Main Methods:

  • Eight subjects with hearing loss were tested with two conditions: flat gain and a treatment insertion gain.
  • Consonant-vowel tokens were presented at various signal-to-noise ratios and the most comfortable listening level (MCL).
  • An analysis of accumulated error differences was used to quantify individual benefits.

Main Results:

  • The treatment gain improved average scores in 31% of trials and decreased scores in 12%.
  • A novel analysis method quantified individual ear benefits from the treatment.
  • The metric allowed for precise characterization of subject-specific phone recognition.

Conclusions:

  • The developed metric effectively evaluates hearing aid insertion gain using consonant recognition.
  • This approach aids audiologists in fine-tuning hearing aids for improved speech perception.
  • The method identifies specific tokens that may be susceptible to gain-related degradation.