Statistical analysis and improvement of coherent-to-diffuse power ratio estimators for dereverberation

Conference contribution


Publication Details

Author(s): Zheng C, Schwarz A, Li X, Kellermann W
Publishing place: Xi'an, China
Publication year: 2016
Pages range: 1-5
ISBN: 978-1-5090-2007-2
Language: English


Abstract

Dereverberation methods based on coherent-to-diffuse power ratio (CDR)
estimates exploit the spatial properties of signals to suppress late
reverberation components. Naturally, the quality of the CDR estimate has
a major effect on the quality of the dereverberated signals. This paper
presents a statistical study of the performance of state-of-the-art CDR
estimators under a Gaussian signal model. The study reveals that the
variance of the magnitude of the spatial coherence estimate is the major
cause for the degradation of known CDR estimators, while the variance
of the phase has only limited impact. Moreover, the variance has more
impact on direction-of-arrival (DOA)-independent CDR estimators than on
DOA-dependent estimators. Accordingly, we propose a cepstrum
thresholding technique to reduce the variance of the spatial coherence
estimate. Experimental results show that better performance can be
achieved for dereverberation when the proposed spatial coherence method
is applied to CDR estimators, especially for the DOA-independent
estimators.


FAU Authors / FAU Editors

Kellermann, Walter Prof. Dr.-Ing.
Professur für Nachrichtentechnik
Zheng, Chengshi
Lehrstuhl für Multimediakommunikation und Signalverarbeitung


How to cite

APA:
Zheng, C., Schwarz, A., Li, X., & Kellermann, W. (2016). Statistical analysis and improvement of coherent-to-diffuse power ratio estimators for dereverberation. (pp. 1-5). Xi'an, CN: Xi'an, China.

MLA:
Zheng, Chengshi, et al. "Statistical analysis and improvement of coherent-to-diffuse power ratio estimators for dereverberation." Proceedings of the International Workshop on Acoustic Echo and Noise Control (IWAENC), Xi'an Xi'an, China, 2016. 1-5.

BibTeX: 

Last updated on 2018-21-10 at 06:40