Experiments with sub-band acoustic echo cancellers for teleconferencing
- 24 March 2005
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 12, 2141-2144
- https://doi.org/10.1109/icassp.1987.1169354
Abstract
Future teleconferencing systems will use wide-band speech and will include acoustic echo control devices to achieve a sufficient quality. The classical echo cancellation algorithms involve an important amount of computations, due to the large adaptive filters identifying the impulse response of the echo path. The sub-band processing approach appears to be a reasonable way to reduce this computational burden, and it affords several other advantages. Two variants of sub-band echo cancellers havebeen implemented and tested: one is based on the two-band splitting of the speech spectrum by a QMF (Quadrature Mirror Filters) pair; the other uses pseudo-QMF banks to achieve the best reduction of the global computations. Performances obtained with both systems are reported. Main degradations due to critical sub-sampling in the pseudo-QMF banks are pointed out and illustrated. Finally, some solutions offering compromises between complexity and performances are proposed.Keywords
This publication has 5 references indexed in Scilit:
- A filter family designed for use in quadrature mirror filter banksPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Modelling of reverberations and audioconference roomsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- A multi-processor structure for signal processing application to acoustic echo cancellationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Kompensation akustischer Echos in FrequenzteilbändernFrequenz, 1985
- Unconstrained frequency-domain adaptive filterIEEE Transactions on Acoustics, Speech, and Signal Processing, 1982