A Hands-Free Phone System Based on a Partitioned Frequency-Domain Adaptive Echo Canceler
Abstract:
Providing means for hands-free conversation is of great interest for industry and is still a current research topic. In this paper, a partitioned frequency-domain adaptive FIR filter is applied in a hands-free phone system to provide echo compensation. It is optimally designed in such a way that it approaches the tracking behavior of the Recursive Least-Squares (RLS) algorithm, and it is combined with a new adaptive step-size control in order to cope with varying far-end/local speaker situations. Its performance is demonstrated by means of real speech signals. Assuming a loudspeaker–room–microphone impulse response duration of 3500 taps, an increase in the critical gain of 14dB has been obtained (for each phone) by using an adaptive echo canceler with 1152 taps. 1
Citations
| 53 | Frequency-domain and multirate adaptive filtering – Shynk - 1992 |
| 4 | Adaptive Filtering Methods – Sommen - 1992 |
| 3 | Adaptive Filter im Frequenzbereich: Analyse und Entwurfsstrategie – Estermann - 1997 |
| 2 | On the Comparison of Optimum Least-Squares and Computationally Efficient DFTBased Adaptive Block Filters – Estermann, Kaelin - 1994 |
| 1 | Kompensation akustischer Rückkopplung – Ganz, Huber - 1995 |
| 1 | Freisprechen mit Verstärkungssteuerung und Echokompensation, volume 380 of Fortschrittberichte VDI, Reihe 10: Informatik/Kommunikationstechnik – Heitkämper - 1995 |
| 1 | Akustische Aspekte der Echokompensation in Freisprecheinrichtungen, volume 400 – Marx - 1996 |
| 1 | Kompensation akustischer Rückkopplung – Marcoli, Hoff - 1996 |
