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An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
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Noise reduction for binaural hearing aids using unsupervised diffuse noise estimator.

Youna Ji1, Youngcheol Park, Dongwook Kim

  • 1Computer & Telecomm Eng Division, Yonsei University, 1 Yonseidae-gil Wonju, Kwangwon-do, Korea.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|January 19, 2012
PubMed
Summary

A novel noise reduction algorithm for hearing aids effectively suppresses diffuse and directional noise. This method preserves crucial directional cues, enhancing listening experiences without distortion.

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Area of Science:

  • Audiology
  • Signal Processing
  • Acoustics

Background:

  • Binaural hearing aids aim to restore natural hearing.
  • Effective noise reduction is crucial for speech intelligibility and user satisfaction.
  • Existing algorithms struggle with nonstationary noise and directional interferences while preserving spatial cues.

Purpose of the Study:

  • To propose a new noise reduction algorithm for binaural hearing aids.
  • To suppress both nonstationary diffuse noise and unknown directional interferences.
  • To ensure the preservation of binaural directional cues.

Main Methods:

  • Utilizing the eigenstructure of the 2x2 input covariance matrix for diffuse noise power spectral density (PSD) estimation.
  • Implementing a compensation process to prevent underestimation of diffuse noise PSD at low frequencies.
  • Estimating interference PSD from target cancelled input signals via signal prediction.

Main Results:

  • The proposed algorithm effectively suppresses nonstationary diffuse noise.
  • Unknown directional interferences are successfully suppressed.
  • Binaural directional cues are preserved without distortion.
  • Computer simulations confirm the algorithm's effectiveness in noise reduction and cue preservation.

Conclusions:

  • The novel algorithm offers significant improvements in noise reduction for binaural hearing aids.
  • Preservation of binaural cues is achieved, enhancing spatial hearing perception.
  • The method provides a robust solution for complex noise environments.