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Convergence of acoustic echo cancellers for hands-free telephones operating under feedback conditions

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1 Author(s)
Schutze, H. ; Deutsche Bundepost TELEKOM Res. Inst., Berlin, Germany

Acoustic echo cancellers for conference circuits with hands-free telephones are capable of identifying a time-invariant room without problems, if no disturbances appear and no feedback exists over a second room. In practice, these conditions are rarely fulfilled. The conditions are given under which acoustic echo cancellers within a closed-loop conference circuit attain the same convergence behavior as in the open-loop case without additional difficulties

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Speech and Audio Processing, IEEE Transactions on  (Volume:1 ,  Issue: 2 )