Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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A Simplified Orthogonal Projection Algorithm for Stereo Acoustic Echo Cancellation

스테레오 음향반향제거를 위한 간략화된 직교투사 알고리즘

  • Received : 2012.08.08
  • Accepted : 2012.08.20
  • Published : 2012.11.30
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Abstract

This paper is on an simplified orthogonal projection method which cancel the acoustic echo signals in the stereo acoustic echo canceller. Comparing with the NLMS algorithm which is widely used for simplicity and stability, it shows that this method has the improvement of the convergence performances for signals with the high auto-correlation, and has small computational quantities. To verify the convergence characteristics of the proposed algorithm, we simulated about various input signals. And we compared the results of simulation for this algorithm with the ones for the NLMS algorithm. By these works, it was proved that the stereo acoustic echo canceller adopting the proposed algorithm shows about 3dB more high ERLE than the NLMS algorithm for the white noise signals, and 5dB for the colored voice signals.

본 논문에서는 스테레오 음향반향제거기의 수렴특성을 향상시키기 위한 간략화된 직교투사법을 제안한다. 간단하고 안정되어 널리 사용되고 있는 기존의 NLMS 알고리즘과 비교하여, 이 기술은 음성신호와 같이 상호상관도가 높은 신호에 대해 수렴성능이 향상되고 연산량이 감소한다. 본 연구에서 제안한 SOP 알고리즘의 성능을 검증하기 위하여 모의실험용 프로그램을 작성하고 시뮬레이션을 수행하였다. 입력신호의 종류와 적응 알고리즘에 따라서 반향제거기의 수렴특성을 관찰한 결과, 제안한 알고리즘을 적용한 스테레오 반향제거기는 백색 잡음을 입력으로 사용하는 경우 약 3dB 정도, 유색 음성신호를 입력으로 사용하는 경우 약 5dB 이상의 ERLE 성능이 개선되는 것을 보여 주었다.

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References

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