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2015 Vol.34, Issue 3
Partitioned Block Frequency Domain Adaptive Filtering Algorithm for Nonlinear Acoustic Echo Cancellation

비선형 음향 반향 제거를 위한 파티션 블록 주파수 영역 적응 필터링 알고리즘

Keunsang Lee1
,
Youna Ji1
,
Youngcheol Park1*
이 근상1
,
지 유나1
,
박 영철1*
1Division of Computer and Telecommunication Engineering, Chanjo, Room 269, Yonsei University
1연세대학교 컴퓨터정보통신공학부
*교신저자. *Corresponding Author. 
31 May 2015. pp. 177-183
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Abstract

This paper proposes a robust nonlinear acoustic echo canceller (NAEC) which is effective for modeling the nonlinearity of a speaker module and the long acoustic echo path within a speech communication environment. The proposed NAEC utilizes a sigmoid pre-processor for modeling the speaker nonlinearity and a partitioned block frequnecy-domain adaptive filter for identifying the acoustic echo path with small delay. Simulation results confirmed that the proposed algorithm achieves excellent performance with much lower computational complexity than the previous NAEC.

Keywords
Nonlinear acoustic echo canceller (NAEC)
partitioned block frequency-domain adaptive filter (PB-FDAF)
nonlinear pre-processor

본 논문은 음성 통신 환경에서 스피커 모듈 비선형 특성 모델링과 긴 음향 반향 경로에서 효율적으로 동작하는 강인한 비선형 음향 반향 제거기를 제안한다. 제안하는 비선형 음향 반향 제거기는sigmoid 전처리기를 사용하여 스피커 모듈의 비선형 특성을 모델링하며, 적은 시간 지연으로 긴 음향 반향 경로를 추정할 수 있도록 파티션 블록 주파수 영역 적응 필터를 사용한다. 실험을 통해 스피커 모듈의 비선형 특성이 발생하는 환경에서 제안 비선형 음향 반향 제거기는 기존 비선형 음향 반향 제거기에 비해 적은 연산량으로 우수한 성능을 보임을 확인하였다.

키워드
비선형 음향반향 제거기
비선형 전처리기
파티션 블록 주파수 영역 적응 필터
References
1
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2
2.B. S. Nollett and D. L. jones, “Nonlinear echo cancellation for handsfree speakerphones,” in Proc. IEEE Workshop on Nonlinear Signal Image Process. (NSIP), Mackinac Island, MI, Sep. 8-10 (1997).
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9.J. P. Borrallo and M. G. Otero, “On the implementation of a partitioned block frequency domain adaptive filter (pbfdaf) for long acoustic echo cancellation,” Signal Process. 27, 301-315 (1992).
10
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 34
  • No :3
  • Pages :177-183
  • Received Date : 2015-02-13
  • Accepted Date : 2015-03-23
  • DOI :https://doi.org/10.7776/ASK.2015.34.3.177
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