On semi-blind estimation of echo paths during double-talk based on nonstationarity

0438818 - ÚTIA 2015 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Koldovský, Zbyněk - Málek, J. - Muller, M. - Tichavský, Petr
On semi-blind estimation of echo paths during double-talk based on nonstationarity.
2014 14th International Workshop on Acoustic Signal Enhancement (IWAENC). USA: IEEE, 2014, s. 198-202. ISBN 978-1-4799-6808-4.
[2014 14th International Workshop on Acoustic Signal Enhancement. Antibes – Juan les Pins (FR), 08.09.2014-11.09.2014]
Grant ostatní: GA ČR(CZ) GA14-11898S
Institucionální podpora: RVO:67985556
Klíčová slova: echo cancellation * relative transfer functions * blind source separation
Kód oboru RIV: BI - Akustika a kmity
http://library.utia.cas.cz/separaty/2014/SI/tichavsky-0438818.pdf

The estimation of a filter that determines an echo path is a difficult problem when double-talk is present. We use a Blind Source Separation model based on signals’ nonstationarity with a partially known mixing matrix to estimate the filter during the double talk. A second-order approximation of a log-likelihood function is used to derive a quadratic criterion. Then, we propose two methods to estimate the filter through minimizing the criterion. The first method works in a batch-offline regime, while the second method is designed to estimate the filter adaptively. The methods are verified by experiments and compared with standard least-squares-based approaches.
Trvalý link: http://hdl.handle.net/11104/0243060