A hybrid acoustic echo canceller and suppressor

Authors:
Fredric Lindstrom;Christian Schüldt;Ingvar Claesson
Affiliations:
Konftel AB, Research and Development, Box 268, SE-90106 Umeå, Sweden;Blekinge Institute of Technology, Department of Signal Processing, SE-37225 Ronneby, Sweden;Blekinge Institute of Technology, Department of Signal Processing, SE-37225 Ronneby, Sweden
Venue:
Signal Processing
Year:
2007

Citing 8
Cited 0

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Abstract

Wideband communication is becoming a desired feature in telephone conferencing systems. This paper proposes a computationally efficient echo suppression control algorithm to be used when increasing the bandwidth of an audio conferencing system, e.g. a conference telephone. The method presented in this paper gives a quality improvement, in the form of increased bandwidth, at a negligible extra computational cost. The increase in bandwidth is obtained through combining a conventional acoustic echo cancellation unit and an acoustic echo suppression unit, i.e. a hybrid echo canceller and suppressor. The proposed solution was implemented in a real-time system. Frequency analysis combined with subjective tests showed that the proposed method extends the bandwidth, while maintaining high quality.