Title:
METHOD AND APPARATUS FOR CONTROLLING ECHO ON BOTH SIDES OF A CONNECTION
Document Type and Number:
WIPO Patent Application WO1998043368
Kind Code:
A3
Abstract:
A single two-ended echo canceller is provided that uses an adaptive FIR filter to model the impulse response of the echo path and cancel the echo originating from the PSTN side of the connection, and a non-linear processor controlled by input signal levels to cancel the echo originating from the mobile phone side of the connection. Since the linear processing function is not used for cancelling echoes of the mobile phone side, the algorithms directed to estimating and cancelling echoes on the two sides of the connection can be executed in a single DSP, with all of the attendant advantages.
Inventors:
ERIKSSON GUNNAR
SVENSSON TOMMY
TRUMP TONU
SVENSSON TOMMY
TRUMP TONU
Application Number:
PCT/SE1998/000535
Publication Date:
January 21, 1999
Filing Date:
March 24, 1998
Export Citation:
Assignee:
ERICSSON TELEFON AB L M (SE)
International Classes:
H04B3/23; H04B7/015; H04M9/08; H04Q11/04; (IPC1-7): H04B3/00
Foreign References:
| US4629829A | 1986-12-16 | |||
| US5283784A | 1994-02-01 | |||
| US5587998A | 1996-12-24 | |||
| DE4216911A1 | 1992-11-26 |
Other References:
ERIKSSON A ET AL: "ERICSSON ECHO CANCELLERS A KEY TO IMPROVED SPEECH QUALITY", ERICSSON REVIEW, vol. 73, no. 1, 1 January 1996 (1996-01-01), pages 25 - 33, XP000584598
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