Calculating Inverse Filters for Speech Dereverberation

Masato MIYOSHI  Marc DELCROIX  Keisuke KINOSHITA  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E91-A   No.6   pp.1303-1309
Publication Date: 2008/06/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e91-a.6.1303
Print ISSN: 0916-8508
Type of Manuscript: INVITED PAPER (Special Section on Acoustic Scene Analysis and Reproduction)
Category: 
Keyword: 
dereverberation,  inverse filter,  linear prediction,  characteristic polynomial,  multi-step linear prediction,  

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Summary: 
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.