Title:
METHODS AND APPARATUS FOR IMPROVING ADAPTIVE FILTER PERFORMANCE BY INCLUSION OF INAUDIBLE INFORMATION
Document Type and Number:
WIPO Patent Application WO2000074362
Kind Code:
A3
Abstract:
Adaptive filtering algorithm training signals incorporate adaptation-enhancing signals having properties, such as spectral whiteness and rapidly decaying auto-correlation between samples, which allow the adaptive filtering algorithms to converge more quickly as compared to conventional algorithms. Exemplary adaptation-enhancing signals are incorporated such that the training signals are not perceptibly altered as compared to conventional training signals. For example, in a hands-free telephony application, an adaptation-enhancing signal according to the invention is dynamically tailored so that it is masked by a loudspeaker signal (the conventional training signal) and is thus inaudible to hands-free telephone users.
Inventors:
RASMUSSON JIM
Application Number:
PCT/EP2000/004666
Publication Date:
March 28, 2002
Filing Date:
May 23, 2000
Export Citation:
Assignee:
ERICSSON TELEFON AB L M (SE)
International Classes:
G10L21/0208; H04B3/23; H04M1/00; H04M1/60; H04M9/08; (IPC1-7): H04M9/08
Foreign References:
| EP0708536A1 | 1996-04-24 | |||
| FR2762467A1 | 1998-10-23 | |||
| US4969144A | 1990-11-06 |
Other References:
TURNER S E: "PASSBAND ECHO CANCELLATION ALGORITHMS FOR HIGH-SPEED MODEMS", PROCEEDINGS OF THE SOUTHEAST CONFERENCE,US,NEW YORK, IEEE, vol. -, 1991, pages 856 - 860, XP000287062, ISBN: 0-7803-0033-5
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