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Howling Detection and Suppression Based on Segmented Notch Filtering.

Yanping Li1, Xiangdong Huang1, Yi Zheng2

  • 1School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China.

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|December 10, 2021
PubMed
Summary
This summary is machine-generated.

A new segmented notch filtering method effectively removes howling in hearing aids. This technique offers superior attenuation, fast response, and avoids nonlinear distortion for improved audio quality.

Keywords:
FIR notch filtercenter frequency controlhowling detectionhowling suppression

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Area of Science:

  • Acoustics
  • Signal Processing
  • Biomedical Engineering

Background:

  • Existing adaptive echo cancellation methods for hearing aid howling removal suffer from inadequate attenuation, slow response times, and nonlinear distortion.
  • These limitations significantly impact the performance and user experience of hearing aid devices.

Purpose of the Study:

  • To address the drawbacks of current howling removal techniques.
  • To propose and validate a novel segmented notch filtering scheme for efficient and high-fidelity howling suppression in hearing aids.

Main Methods:

  • A segmented notch filtering scheme is proposed, utilizing a closed-form formula for filter coefficient calculation.
  • The theoretical properties of the filter, including its even function characteristic ensuring linear transfer, are analyzed.
  • Transient samples from Finite Impulsive Response (FIR) filtering are precisely managed to prevent nonlinear distortion.

Main Results:

  • The proposed method achieves an attenuation of -330 dB at detected howling frequencies.
  • The closed-form formula enables rapid filter coefficient calculation, ensuring a fast response to sudden howling events.
  • Experimental results demonstrate accurate howling frequency estimation, complete removal, and a signal-to-noise ratio (SNR) recovery of approximately 22 dB.

Conclusions:

  • The segmented notch filtering scheme effectively overcomes the limitations of existing methods for hearing aid howling removal.
  • The technique provides high attenuation, fast response, and linear characteristics, avoiding nonlinear distortion.
  • This approach shows significant potential for enhancing hearing aid technology and related audio processing applications.