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Using Objective Metrics to Measure Hearing Aid Performance.

James M Kates1, Kathryn H Arehart1, Melinda C Anderson2

  • 1University of Colorado, Boulder, Colorado, USA.

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Summary
This summary is machine-generated.

New metrics, the hearing aid speech perception index (HASPI) and hearing aid speech quality index (HASQI), effectively measure commercial hearing aid performance, revealing differences across manufacturers and settings.

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Area of Science:

  • Audiology and Hearing Science
  • Signal Processing
  • Biomedical Engineering

Background:

  • Standardized hearing aid measurements assess basic function but lack predictive power for real-world outcomes.
  • Objective metrics are needed to evaluate complex signal processing interactions and individual hearing loss.
  • The hearing aid speech perception index (HASPI) and hearing aid speech quality index (HASQI) offer potential solutions.

Purpose of the Study:

  • To demonstrate the feasibility of applying HASPI and HASQI metrics to commercial hearing aids.
  • To illustrate the expected range of values obtained using these novel metrics.
  • To identify implementation challenges for HASPI and HASQI compared to conventional measurements.

Main Methods:

  • Utilized HASPI and HASQI to analyze commercial hearing aids from multiple manufacturers.
  • Incorporated an auditory model accounting for peripheral hearing loss.
  • Varied signal-to-noise ratios, presentation levels, and processing configurations (linear to nonlinear).

Main Results:

  • HASPI and HASQI detected statistically significant performance differences between hearing aid devices and processing strategies.
  • Both metrics captured audibility and nonlinear distortion, identifying conditions with high predicted intelligibility but low speech quality.
  • Manufacturer and degree of processing significantly impacted HASPI and HASQI results; hearing loss affected HASPI.

Conclusions:

  • HASPI and HASQI provide a comprehensive assessment of hearing aid performance, including interactions missed by traditional methods.
  • Significant variations were observed across manufacturers, processing settings, and hearing loss adjustments.
  • Further research is required to establish clinical relevance and define target values for successful hearing aid fittings.