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Related Experiment Videos

A digital filterbank hearing aid: three digital signal processing algorithms--user preference and performance

T Lunner1, J Hellgren, S Arlinger

  • 1Department of Neuroscience, Linköping University, Sweden.

Ear and Hearing
|November 14, 1997
PubMed
Summary

Most hearing aid users preferred digital signal processing algorithms with wide dynamic range compression in low frequencies and adjustable gain in high frequencies. User preference correlated with auditory dynamic range measurements, guiding future hearing aid fitting strategies.

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Area of Science:

  • Audiology and Hearing Science
  • Digital Signal Processing in Acoustics
  • Wearable Technology for Hearing Impairment

Background:

  • Wearable digital filterbank hearing aids utilize advanced signal processing algorithms to improve user experience.
  • Comparing different compression strategies (wide dynamic range syllabic compression vs. compression limiting) is crucial for optimizing hearing aid performance.
  • Understanding user preference for specific algorithm features, such as adjustable gain and compression types, informs device development.

Purpose of the Study:

  • To compare user preference and performance of three digital signal processing algorithms (RangeEar, DynEar, LinEar) in a wearable hearing aid.
  • To evaluate the impact of different compression strategies in low-frequency (LF) and high-frequency (HF) channels on user satisfaction.
  • To investigate the relationship between auditory dynamic range measurements and user preference for specific hearing aid algorithms.

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Main Methods:

  • A 1-month blind field test involving 13 hearing aid users with symmetrical sensorineural hearing loss.
  • Comparison of RangeEar, DynEar, and LinEar algorithms, each offering individual frequency shaping via a seven-band filterbank.
  • Objective data logging of algorithm usage and volume control adjustments, alongside subjective preference ratings and speech intelligibility tests (S/N-threshold).

Main Results:

  • A majority of users (10 out of 13) preferred algorithms utilizing wide dynamic range syllabic compression in the LF channel (RangeEar or DynEar).
  • User preference was predictable based on auditory dynamic range measurements, with broader LF and narrower HF dynamic ranges favoring preferred algorithms.
  • While preferred fittings received higher sound quality and clearness ratings, no significant differences in speech signal-to-noise ratio (S/N) were observed.

Conclusions:

  • Most participants favored hearing aid algorithms offering wide dynamic range compression in the low-frequency channel.
  • Adjustable gain in the high-frequency channel, whether manual (DynEar) or automatic (RangeEar), was a key factor in user preference.
  • Auditory dynamic range characteristics significantly influence user preference, providing valuable insights for personalized hearing aid fitting.