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Related Experiment Video

Updated: Dec 31, 2025

Author Spotlight: Investigating the Impact of Emotional Prosodies on Voice Recognition and Perception
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Speech Enhancement by Filtering in the Loudness Domain.

B Kollmeier1

  • 1Drittes Physikalisches Institut, Universität Göttingen, Göttingen, Fed. Rep. of Germany.

Acta Oto-Laryngologica
|January 8, 2020
PubMed
Summary

Loudness compensation improved speech intelligibility for hearing-impaired individuals by optimizing gain. Enhancing dynamic intensity modulations did not significantly affect speech discrimination in quiet or noisy environments.

Keywords:
digital hearing aidloudness perceptionmodulation discriminationspeech intelligibility

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Area of Science:

  • Audiology
  • Hearing Science
  • Signal Processing

Background:

  • Previous dynamic compression methods failed to enhance speech intelligibility in cochlear impairment with recruitment.
  • Attenuation of dynamic intensity modulations (1-50 Hz) hinders speech discrimination.

Purpose of the Study:

  • To investigate an approach enhancing dynamic intensity modulations using an envelope highpass filter in the loudness domain.
  • To assess the impact of this enhanced loudness compensation on speech intelligibility in hearing-impaired subjects.

Main Methods:

  • An algorithm was developed to extract, convert to loudness, highpass filter, and reconvert envelopes.
  • The method simulated a digital hearing aid tailored to individual loudness-scaling functions.
  • Speech discrimination was tested in quiet and noise with and without the highpass filter.

Main Results:

  • Loudness compensation without highpass filtering improved speech intelligibility across various input levels.
  • An optimum gain characteristic was achieved at all input levels with loudness compensation.
  • The highpass filter applied to the envelope showed no significant effect on speech discrimination.

Conclusions:

  • Loudness compensation is effective in improving speech intelligibility for hearing-impaired individuals.
  • Enhancing dynamic intensity modulations via loudness domain highpass filtering does not further improve speech discrimination.
  • The study highlights the importance of optimizing gain characteristics for better speech perception.