Optimized Wiener Filter for Noise Reduction in VoIP Environments

VoIP 환경에서의 잡음제거를 위한 최적화된 위너 필터

  • 정상배 (한국정보통신대학교(ICU) 공학부) ;
  • 이성독 (한국정보통신대학교(ICU) 공학부) ;
  • 한민수 (한국정보통신대학교(ICU) 공학부)
  • Published : 2007.12.30

Abstract

Noise reduction technologies are indispensable to achieve acceptable speech quality in VoIP systems. This paper proposes a Wiener filter optimized to the estimated SNR of noisy speech for the noise reduction in VoIP environments. The proposed noise canceller is applied as a pre-processor before speech encoding. The performance of the proposed method is evaluated by the PESQ in various noisy conditions. In this paper, the proposed algorithm is applied to G.711, G.723.1, and G.729A which are all VoIP speech codecs. The PESQ results show that the performance of our proposed noise reduction scheme outperforms those of the noise suppression in the IS-127 EVRC and the ETSI standard for the advanced distributed speech recognition front-end.

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