The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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A Robust Frequency-Domain Multi-Reference Narrowband Adaptive Noise Canceller

여러 개의 참고입력 신호를 사용하는 강인한 주파수 영역 협대역 잡음 제거기

  • 김성우 (연세대학교 전기전자 공학과) ;
  • 서지호 (연세대학교 전기전자 공학과) ;
  • 류영우 (국방과학연구소) ;
  • 박영철 (연세대학교 컴퓨터정보통신공학부) ;
  • 윤대희 (연세대학교 전기전자 공학과)
  • Received : 2015.01.08
  • Accepted : 2015.03.03
  • Published : 2015.03.31
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Abstract

In this paper, it is shown that the performance of the frequency-domain multi-reference narrowband noise canceller is determined by the narrowband component to the broadband disturbance power ratio in the reference signals. To overcome this problem, a new narrowband ANC is proposed, where the update of the adaptive filter is determined based on SNR of the reference inputs being measured using the magnitude squared coherence (MSC) between the primary and the reference signals. Simulation results show that the proposed ANC has superior performance over the conventional one.

본 논문에서는 여러 개의 참고입력을 사용하는 기존의 주파수 영역 협대역 잡음 제거기의 성능이 참고신호에 포함된 협대역 성분과 광대역 방해 신호에 의해 결정됨을 보였다. 또한 기존의 협대역 잡음 제거기 보다 효율적이고 빠른 수렴 속도를 얻기 위해 주신호와 참고신호들의 MSC(Magnitude Squared Coherence)를 사용하여 참고신호의 SNR을 측정하고, 이를 바탕으로 적응 필터의 갱신 여부를 결정하는 새로운 협대역 적응 잡음 제거 기법을 제안하였다. 수식적 분석을 통하여 광대역 방해 신호의 영향을 분석하였으며, 제안한 기법이 기존 기법보다 더 우수한 성능을 보임을 확인하였다.

Keywords

References

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