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Cascaded power symmetric IIR filter banks and continuity constrained adaptive algorithms for acoustic echo cancellation in subbands

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2 Author(s)
Tanrikulu, O. ; DSP Software Eng. Inc., Bedford, MA, USA ; Constantinides, A.G.

Teleconferencing systems and hands-free mobile terminals use acoustic echo cancellation (AEC) for high-quality full-duplex speech communication. The problem of aliasing in subband AEC is addressed. Filter banks with implicit notch filtering are derived from cascaded power symmetric-infinite impulse response (CFS-IIR) filters. It is shown that adaptive filters used with these filter banks must be coupled via continuity constraints to reduce the aliasing in the residual echo. A continuity constrained NLMS algorithm is therefore proposed and evaluated

Published in:

Signal Processing, IEEE Transactions on  (Volume:46 ,  Issue: 8 )

Date of Publication:

Aug 1998

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