Coherent-to-diffuse power ratio estimation for dereverberation

Schwarz A, Kellermann W (2015)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2015


Publisher: Institute of Electrical and Electronics Engineers (IEEE)

Book Volume: 23

Pages Range: 1006-1018

Article Number: 7076629

Journal Issue: 6

DOI: 10.1109/TASLP.2015.2418571


The estimation of the time- and frequency-dependent coherent-to-diffuse power ratio (CDR) from the measured spatial coherence between two omnidirectional microphones is investigated. Known CDR estimators are formulated in a common framework, illustrated using a geometric interpretation in the complex plane, and investigated with respect to bias and robustness towards model errors. Several novel unbiased CDR estimators are proposed, and it is shown that knowledge of either the direction of arrival (DOA) of the target source or the coherence of the noise field is sufficient for unbiased CDR estimation. The validity of the model for the application of CDR estimates to dereverberation is investigated using measured and simulated impulse responses. A CDR-based dereverberation system is presented and evaluated using signal-based quality measures as well as automatic speech recognition accuracy. The results show that the proposed unbiased estimators have a practical advantage over existing estimators, and that the proposed DOA-independent estimator can be used for effective blind dereverberation.

Authors with CRIS profile

How to cite


Schwarz, A., & Kellermann, W. (2015). Coherent-to-diffuse power ratio estimation for dereverberation. IEEE Transactions on Audio Speech and Language Processing, 23(6), 1006-1018.


Schwarz, Andreas, and Walter Kellermann. "Coherent-to-diffuse power ratio estimation for dereverberation." IEEE Transactions on Audio Speech and Language Processing 23.6 (2015): 1006-1018.

BibTeX: Download