Name
Abstract | ||
|---|---|---|
Acoustic echo cancellers in today's speakerphones or video conferencing systems rely on the assumption of a linear echo path. Low-cost audio equipment or constraints of portable communication systems cause nonlinear distortions, which limit the echo return loss enhancement achievable by linear adaptation schemes. These distortions are a super-position of different effects, which can be modelled either as memoryless nonlinearities or as nonlinear systems with memory. Proper adaptation schemes for both cases of nonlinearities are discussed. An echo canceller for nonlinear systems with memory based on an adaptive second order Volterra filter is presented. Its performance is demonstrated by measurements with small loudspeakers. The results show an improvement in the echo return loss enhancement of 7 dB over a conventional linear adaptive filter. The additional computational requirement for the presented Volterra filter is comparable to that of existing acoustic echo cancellers. |
Year | DOI | Venue |
|---|---|---|
1999 | 10.1109/ICASSP.1999.759811 | Acoustics, Speech, and Signal Processing, 1999. Proceedings., 1999 IEEE International Conference |
Keywords | Field | DocType |
acoustic signal processing,adaptive filters,adaptive signal processing,echo suppression,filtering theory,loudspeakers,memoryless systems,nonlinear distortion,teleconferencing,telephone sets,2nd order adaptive Volterra filters,acoustic echo cancellers,echo return loss enhancement,linear adaptation schemes,linear adaptive filter,linear echo path,loudspeakers,low-cost audio equipment,measurements,memory,memoryless nonlinearities,nonlinear acoustic echo cancellation,nonlinear distortions,nonlinear systems,performance,portable communication systems,speakerphones,video conferencing systems | Teleconference,Nonlinear system,Control theory,Computer science,Communications system,Artificial intelligence,Adaptive filter,Loudspeaker,Return loss,Pattern recognition,Volterra filters,Speech recognition,Nonlinear distortion | Conference |
Volume | ISSN | ISBN |
2 | 1520-6149 | 0-7803-5041-3 |
Citations | PageRank | References |
53 | 4.00 | 3 |
Authors | ||
3 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| A. Stenger | 1 | 91 | 14.79 |
| L. Trautmann | 2 | 67 | 7.49 |
| R. Rabenstein | 3 | 119 | 15.00 |