Unbiased coherent-to-diffuse ratio estimation for dereverberation

Conference contribution
(Conference Contribution)


Publication Details

Author(s): Schwarz A, Kellermann W
Publication year: 2014
Pages range: 6-10
ISBN: 978-1-4799-6808-4
Language: English


Abstract


We investigate the estimation of the time-and frequency-dependent coherent-to-diffuse ratio (CDR) from the measured spatial coherence between two omnidirectional microphones. We illustrate the relationship between several known CDR estimators using a geometric interpretation in the complex plane, discuss the problem of estimator bias, and propose unbiased versions of the estimators. Furthermore, we show that knowledge of either the direction of arrival (DOA) of the target source or the coherence of the noise field is sufficient for an unbiased CDR estimation. Finally, we apply the CDR estimators to the problem of dereverberation, using automatic speech recognition word error rate as objective performance measure.


FAU Authors / FAU Editors

Kellermann, Walter Prof. Dr.-Ing.
Professur für Nachrichtentechnik
Schwarz, Andreas
Professur für Nachrichtentechnik


How to cite

APA:
Schwarz, A., & Kellermann, W. (2014). Unbiased coherent-to-diffuse ratio estimation for dereverberation. In Proceedings of the International Workshop on Acoustic Signal Enhancement (IWAENC) (pp. 6-10). Antibes - Juan les Pins, FR.

MLA:
Schwarz, Andreas, and Walter Kellermann. "Unbiased coherent-to-diffuse ratio estimation for dereverberation." Proceedings of the International Workshop on Acoustic Signal Enhancement (IWAENC), Antibes - Juan les Pins 2014. 6-10.

BibTeX: 

Last updated on 2019-03-06 at 07:11