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Related Experiment Videos

A procedure for testing speech intelligibility in a virtual listening environment

J Koehnke1, J M Besing

  • 1Department of Speech Pathology and Audiology, University of South Alabama, Mobile, USA.

Ear and Hearing
|June 1, 1996
PubMed
Summary

This study developed a virtual reality test for speech intelligibility in noise, simulating everyday listening. Results show spatial separation of speech and noise significantly improves understanding, especially in anechoic conditions.

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Area of Science:

  • Audiology
  • Acoustics
  • Virtual Reality

Background:

  • Assessing speech intelligibility in noise is crucial for understanding auditory perception.
  • Simulating realistic listening environments is challenging in traditional laboratory settings.

Purpose of the Study:

  • To develop and validate a virtual reality (VR) based test for measuring speech intelligibility in noise.
  • To simulate everyday listening situations and control for confounding factors using digital signal processing.

Main Methods:

  • Utilized KEMAR measurements of source-to-eardrum transfer functions in anechoic and reverberant spaces.
  • Processed monosyllabic words and speech-spectrum noise for presentation via earphones.
  • Employed an adaptive procedure to determine signal-to-noise (S/N) ratios for 50% intelligibility.

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Main Results:

  • Normal-hearing listeners required lower S/N ratios for 50% intelligibility in virtual anechoic versus reverberant environments.
  • Speech intelligibility significantly improved with spatial separation of speech and noise sources in both environments.
  • The intelligibility gain from source separation was four times greater in the anechoic environment compared to the reverberant environment.

Conclusions:

  • The developed VR test is easy to administer and score.
  • It effectively measures the impact of source separation and reverberation on speech intelligibility in noise.
  • This tool eliminates confounding variables like calibration, offering a controlled assessment of auditory perception.