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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(6):1303-1309; doi:10.1093/ietfec/e91-a.6.1303
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Acoustic Scene Analysis and Reproduction - Papers

Calculating Inverse Filters for Speech Dereverberation

Masato MIYOSHI1, Marc DELCROIX1 and Keisuke KINOSHITA1

1 The authors are with NTT Communication Science Laboratories, NTT Corporation, Kyoto-fu, 619-0237 Japan. E-mail: miyo{at}cslab.kecl.ntt.co.jp


  Abstract

Speech dereverberation is one of the most difficult tasks in acoustic signal processing. Of the various problems involved in this task, this paper highlights "over-whitening," which flattens the characteristics of recovered speech. This distortion sometimes happens when inverse filters are directly calculated from microphone signals. This paper reviews two studies related to this problem. The first study shows the possibility of compensating for such over-whitening to achieve precise speech-dereverberation. The second study presents a new approach for approximating the original speech by removing the effect of late reflections from observed reverberant speech.

Key Words: dereverberation, inverse filter, linear prediction, characteristic polynomial, multi-step linear prediction

Manuscript received February 4, 2007.


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