Delayed filter update: an acoustic echo canceler structure for improved doubletalk detection handling

Authors:
Fredric Lindstrom;Mattias Dahl;Ingvar Claesson
Affiliations:
Department of Signal Processing, Blekinge Institute of Technology, Ronneby, Sweden;Department of Signal Processing, Blekinge Institute of Technology, Ronneby, Sweden;Department of Signal Processing, Blekinge Institute of Technology, Ronneby, Sweden
Venue:
ICECS'03 Proceedings of the 2nd WSEAS International Conference on Electronics, Control and Signal Processing
Year:
2003

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Abstract

This paper proposes an algorithm for doubletalk detection handling. The algorithm is aimed for a delayed filter update structure of an acoustic echo canceler. Key features employing this method are: avoidance of filter divergence in situations of undetected doubletalk and fast recovery from erroneous doubletalk detection, i.e. mistaken echo path change for doubletalk. The virtues of the proposed algorithm is demonstrated through simulations using real speech signals.