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A Binaural Steering Beamformer System for Enhancing a Moving Speech Source.

Kamil Adiloğlu1, Hendrik Kayser2, Regina M Baumgärtel2

  • 1HörTech gGmbH, Oldenburg, Germany Cluster of Excellence "Hearing4all," Oldenburg, Germany k.adiloglu@hoertech.de.

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Summary

This study introduces a new binaural sound processing method to help hearing-impaired individuals focus on desired sounds amidst noise. The approach significantly improves speech clarity and quality for users.

Keywords:
audio signal localizationobjective evaluationperceptual evaluationsignal enhancementspeech intelligibility

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Area of Science:

  • Auditory signal processing
  • Hearing science
  • Acoustics

Background:

  • Normal-hearing listeners can segregate target sounds from noise using spatial and spectral cues.
  • Hearing-impaired individuals and cochlear implant users struggle with sound source segregation in complex acoustic environments.
  • Distinguishing target sounds from interfering sources is crucial for effective communication.

Purpose of the Study:

  • To develop and evaluate a binaural approach for tracking and enhancing moving target sounds.
  • To improve speech intelligibility and quality for hearing-impaired listeners and cochlear implant users.
  • To compare the proposed method against a fixed-direction sound enhancement technique.

Main Methods:

  • A real-time signal processing platform was used to implement a binaural approach.
  • The system incorporates a spatial filter guided by a direction-of-arrival estimator to track moving sound sources.
  • Objective and subjective evaluations were conducted using a virtual acoustics-generated dataset featuring a moving sound source in diffuse noise.

Main Results:

  • The proposed binaural method demonstrated significant improvements in speech intelligibility compared to unprocessed signals.
  • Speech quality was also significantly enhanced by the proposed method.
  • The sound tracking and enhancement approach outperformed a fixed (nonsteering) sound processing method.

Conclusions:

  • The developed binaural approach effectively enhances target sound sources, even when they are moving.
  • This technology offers a promising solution for improving communication for individuals with hearing impairments.
  • The method provides a substantial benefit over traditional nonsteering sound processing techniques.