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CASA Based Approach to Estimate Acoustic Transfer Function Ratios

CASA 기반의 마이크간 전달함수 비 추정 알고리즘

Minkyu Shin
,
Hanseok† Ko†
신 민규
,
고 한석††
Engineering building room 419 or room 439 Department of Electronics and Computer Engineering, Korea University Anam Campus
고려대학교 전자전기전파공학부
†교신저자. †Corresponding Author. 
31 January 2014. pp. 54-59
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Abstract

Identification of RTF (Relative Transfer Function) between sensors is essential to multichannel speech enhancement system. In this paper, we present an approach for estimating the relative transfer function of speech signal. This method adapts a CASA (Computational Auditory Scene Analysis) technique to the conventional OM-LSA (Optimally-Modified Log-Spectral Amplitude) based approach. Evaluation of the proposed approach is performed under simulated stationary and nonstationary WGN (White Gaussian Noise). Experimental results confirm advantages of the proposed approach.

Keywords
System identification
Relative transfer function
Multi-microphone speech enhancement

본 논문은 비정상 (nonstationary)특성을 가지는 잡음환경에서 마이크간 전달함수 비 (RTF, Relative Transfer Function) 추정 알고리즘을 제안한다. 음성을 이용한 다양한 기기에 다중 마이크를 이용한 잡음제거 기술은 널리 사용되며, 이때 각 마이크간의 입력 신호 사이의 관계는 필수적으로 추정되어야 한다. 본 논문에서는 기존의 OM-LSA (Optimally-Modified Log-Spectral Amplitude)기반의 추정 방식에 CASA (Computational Auditory Scene Analysis) 를 접목시킨 방식을 제안한다. 제안한 방법의 성능 검증을 위하여 비정상 백색 잡음 (nonstationary white Gaussian noise) 환경에서 10명 화자 발음을 이용한 마이크간 전달함수 비 추정 성능 평가 실험을 수행하였다. 잡음 신호가 초당 8dB 증감하는 환경에서 SBF (Signal Blocking Factor)가 평균 2.65dB 개선됨을 확인하였다.

키워드
전달함수 차이
마이크 어레이
잡음제거
References
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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 : 33
  • No :1
  • Pages :54-59
  • Received Date : 2013-09-24
  • Revised Date : 2013-10-25
  • Accepted Date : 2013-10-25
  • DOI :https://doi.org/10.7776/ASK.2014.33.1.054
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