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Preserving spatial perception in rooms using direct-sound driven dynamic range compression.

Henrik Gert Hassager1, Tobias May1, Alan Wiinberg1

  • 1Hearing Systems Group, Department of Electrical Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.

The Journal of the Acoustical Society of America
|July 7, 2017
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Summary
This summary is machine-generated.

New hearing aid technology preserves spatial audio perception by adaptively adjusting compression. This direct-sound driven system minimizes distortion, unlike traditional fast-acting systems, enhancing listener experience.

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Area of Science:

  • Auditory perception
  • Acoustics
  • Hearing aid technology

Background:

  • Fast-acting hearing aid compression can distort spatial audio cues by amplifying reverberation.
  • This distortion negatively impacts the perception of sound source location and distribution.

Purpose of the Study:

  • To investigate a novel direct-sound driven compression system for hearing aids.
  • To determine if adaptive time constants can preserve listeners' spatial impression.

Main Methods:

  • Developed a compression system that applies fast-acting processing to direct sound and linear processing to reverberation.
  • Evaluated the system with normal-hearing listeners using virtualized speech stimuli.
  • Listeners reported perceived sound image location and distribution in the horizontal plane.

Main Results:

  • Independent and linked compression distorted sound images, causing broadening, internalization, and splitting.
  • Linked direct-sound driven compression maintained spatial perception comparable to linear processing.
  • Independent direct-sound driven compression induced a sense of sound movement between ears.

Conclusions:

  • Linked direct-sound driven compression effectively preserves spatial audio perception.
  • Maintaining interaural level differences is crucial for this compression scheme.
  • This approach offers a promising alternative to conventional fast-acting hearing aid compression.