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On a reference-free speech quality estimator for hearing aids.

David Suelzle1, Vijay Parsa, Tiago H Falk

  • 1National Centre for Audiology, Western University, London, Ontario, Canada. dsuelzle@uwo.ca

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A new reference-free speech quality measure for hearing aids was evaluated. It showed lower correlation with listener ratings compared to reference-based methods, despite potential advantages.

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Area of Science:

  • Audiology
  • Signal Processing
  • Acoustics

Background:

  • Assessing speech quality in hearing aids is crucial for user satisfaction.
  • Existing electroacoustic measures often require a clean reference signal, limiting real-world application.
  • Developing reference-free metrics is essential for practical hearing aid evaluation.

Purpose of the Study:

  • To propose and evaluate a novel reference-free speech quality measure for hearing aid applications.
  • To compare the performance of the reference-free measure against a state-of-the-art reference-based measure.
  • To assess the correlation of the proposed measure with subjective speech quality ratings from hearing-impaired listeners.

Main Methods:

  • A new reference-free speech quality metric was developed.
  • The metric was validated using subjective listening tests with hearing-impaired individuals.
  • Noisy and reverberant listening conditions were simulated.
  • Results were compared to a traditional electroacoustic measure requiring a clean reference signal.

Main Results:

  • The proposed reference-free speech quality measure demonstrated a lower correlation with subjective listener ratings compared to the reference-based measure.
  • The reference-based measure showed a higher correlation with perceived speech quality.
  • Despite lower correlation, the reference-free approach offers distinct advantages.

Conclusions:

  • The evaluated reference-free speech quality measure requires further refinement to match the performance of reference-based methods for hearing aid applications.
  • The study highlights the challenges in developing accurate reference-free objective speech quality metrics.
  • Potential benefits and future research directions for the reference-free approach are discussed.