Title:
ECHO CANCELLATION FILTER
Document Type and Number:
WIPO Patent Application WO2005011234
Kind Code:
A3
Abstract:
An echo canceler includes an recursive least squares lattice to whiten a far-end signal s1(t) and provide whitened time delays. The echo canceler further decorrelates a microphone signal based on the whitened time delays to reduce echoes of the far-end signal s1(t) that are contained in the microphone signal x2(t). The echo canceler does not use a double-talk detector and avoids all problems inherent with their use. Thus, speaker phones, and other communication devices, can continuously operate in full-duplex mode of operation thereby providing natural conversational hands-free communication.
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Inventors:
GUNTHER JACOB H (US)
Application Number:
PCT/US2004/017897
Publication Date:
March 31, 2005
Filing Date:
June 04, 2004
Export Citation:
Assignee:
UNIV UTAH STATE (US)
GUNTHER JACOB H (US)
GUNTHER JACOB H (US)
International Classes:
H04M9/08; (IPC1-7): H04M1/00
Foreign References:
| US6529606B1 | 2003-03-04 | |||
| US6151397A | 2000-11-21 | |||
| US6002776A | 1999-12-14 | |||
| US5694474A | 1997-12-02 |
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