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Modification of frequency-domain active noise control algorithm without secondary path modeling.

Kai Chen1, Feng Niu1, Haishan Zou1

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Summary
This summary is machine-generated.

This study improves active noise control (ANC) by addressing circular convolution issues. New methods enhance noise attenuation and system convergence for more effective sound reduction.

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Area of Science:

  • Acoustics
  • Signal Processing

Background:

  • Phase-shifting active noise control (ANC) offers simple implementation and efficiency.
  • Standard frequency-domain ANC suffers from implicit circular convolution, degrading performance.

Purpose of the Study:

  • To address performance degradation in phase-shifting ANC caused by circular convolution artifacts.
  • To improve the linear relationship between signals for better convergence and noise attenuation.

Main Methods:

  • Proposed two methods to mitigate circular convolution artifacts in frequency-domain ANC.
  • Method 1: Time-domain constraining to remove wraparound artifacts.
  • Method 2: Employing a noncausal phase-shifting filter for signal regularization.

Main Results:

  • Both proposed methods successfully eliminated wraparound artifacts from circular convolution.
  • Improved linear relationship between phase-shifted reference and error signals observed.
  • Achieved higher noise attenuation compared to standard frequency-domain ANC.

Conclusions:

  • The developed algorithms enhance the performance of phase-shifting ANC systems.
  • The methods offer improved noise reduction capabilities with manageable computational cost.
  • Simulation results confirm the superior noise attenuation of the proposed techniques.