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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Wearable Hearing Device Spectral Enhancement Driven by Non-Negative Sparse Coding-Based Residual Noise Reduction.

Seon Man Kim1

  • 1Korea Photonics Technology Institute, Gwangju 61007, Korea.

Sensors (Basel, Switzerland)
|October 14, 2020
PubMed
Summary

This study introduces a novel NNSC-Wiener filter for enhanced speech in hearing aids. This method significantly reduces residual noise, outperforming existing techniques across various noisy conditions.

Keywords:
Wiener filterhearing aidhearing devicenon-negative sparse codingresidual noisespeech enhancement

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Area of Science:

  • Signal Processing
  • Acoustics
  • Hearing Aid Technology

Background:

  • Speech enhancement is crucial for hearing aid effectiveness.
  • Traditional spectral statistical filters struggle with residual noise in noisy environments.
  • Non-negative sparse coding (NNSC) offers potential for noise reduction.

Purpose of the Study:

  • To develop an improved spectral statistical filter for speech enhancement in wearable hearing devices.
  • To create an online unified framework addressing residual noise issues.
  • To enhance speech quality in hearing aids using a novel NNSC-Wiener filter.

Main Methods:

  • Implementation of a 32-channel uniform polyphase discrete Fourier transform filter bank with an 8 ms processing delay.
  • Integration of non-negative sparse coding (NNSC) with spectral statistical filtering.
  • Development of an NNSC-based Wiener spectral gain attenuator using a priori SNR estimation and component decomposition.

Main Results:

  • The proposed NNSC-Wiener filter effectively overcomes residual noise in noisy environments.
  • Evaluations using perceptual speech quality scores demonstrated superior performance.
  • The method outperformed conventional Wiener filters and other NNSC-based speech enhancement techniques across all tested SNRs (-5 to 20 dB).

Conclusions:

  • The novel NNSC-Wiener filter provides a significant advancement in speech enhancement for hearing aids.
  • This technique offers a robust solution for improving speech intelligibility in challenging acoustic conditions.
  • The proposed method represents a promising direction for future hearing device development.