A METHOD FOR ENHANCING THE ACOUSTIC ECHO CANCELLATION SYSTEM USING RESIDUAL ECHO FILTER

Title:

A METHOD FOR ENHANCING THE ACOUSTIC ECHO CANCELLATION SYSTEM USING RESIDUAL ECHO FILTER

Document Type and Number:

WIPO Patent Application WO2005002184

Kind Code:

A3

Abstract:

This invention discloses an improvement to a digital Acoustic Echo Control (AEC) in hands-free telephones. It describes an additional adaptive filter referred to as a residual echo filter, which is placed after the usual echo canceller and it is used to efficiently and accurately estimate a residual echo signal b(i) and a system coupling factor ß(i), which can be utilized to establish an efficient control for the AEC system and construct the appropriate filters. The invention also describes a control block means performing a joint operation control of the echo canceller, residual echo suppressor and residual echo filter for achieving more consistent echo cancellation results and enhancing output signal quality.

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Inventors:

MYLLYLAE VILLE (FI)
ENZNER GERALD (DE)

Application Number:

PCT/IB2004/002114

Publication Date:

May 12, 2005

Filing Date:

June 24, 2004

Export Citation:

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Assignee:

NOKIA CORP (FI)
NOKIA INC (US)
MYLLYLAE VILLE (FI)
ENZNER GERALD (DE)

International Classes:

H04B1/10; H04M1/00; H04M1/58; H04M9/00; H04M9/08; H04M; (IPC1-7): H04M1/00; H04M9/00; H04M9/08

Foreign References:

US20030219113A1	2003-11-27
US6507653B1	2003-01-14

Other References: