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The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe
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Integrating a remote microphone with hearing-aid processing.

James M Kates1, Kathryn H Arehart1, Lewis O Harvey2

  • 1Department of Speech, Language, and Hearing Sciences, University of Colorado, Boulder, Colorado 80309, USA.

The Journal of the Acoustical Society of America
|July 1, 2019
PubMed
Summary
This summary is machine-generated.

Remote microphones (RM) enhance hearing aid (HA) speech intelligibility but can degrade spatial perception. Synthesized cues improve externalization, but HA processing interactions were evaluated. Results show a trade-off between clarity and spatial awareness.

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Area of Science:

  • Audiology and Hearing Science
  • Acoustics and Psychoacoustics
  • Signal Processing for Hearing Aids

Background:

  • Remote microphones (RM) improve speech intelligibility in challenging acoustic environments for hearing aid (HA) users.
  • However, RMs can degrade binaural cues essential for sound externalization and spatial awareness.
  • Augmenting RM signals with synthesized binaural cues and reflections may restore spatial perception, but HA processing interactions are a concern.

Purpose of the Study:

  • To evaluate the effectiveness of augmented remote microphone (RM) signals combined with hearing aid (HA) processing on speech intelligibility and spatial perception.
  • To investigate potential interactions between augmented RM signals and HA processing, including linear amplification and dynamic-range compression.
  • To assess the impact of earmold vent diameter on clarity, quality, externalization, and source width.

Main Methods:

  • A realistic listening simulation incorporating a dummy head for reverberation measurement was used.
  • Hearing aid (HA) processing included linear amplification or independent dynamic-range compression with vented earmolds.
  • Hearing-impaired listeners rated intelligibility, clarity, quality, externalization, and apparent source width of sentence stimuli.

Main Results:

  • Remote microphone (RM) use significantly improved speech intelligibility but reduced spatial impression.
  • Increasing earmold vent diameter decreased clarity and quality while enhancing spatial impression.
  • Listener ratings indicated a trade-off between acoustic clarity/quality and spatial attributes (externalization, source width).

Conclusions:

  • Augmented RM signals and HA processing influence both speech intelligibility and spatial perception.
  • The observed trade-off between clarity and spatial impression can be explained by interaural cross-correlation.
  • Optimizing RM and HA parameters, including earmold acoustics, is crucial for balancing intelligibility and spatial awareness.