Title:
NETWORK ECHO SUPPRESSION IN MOBILE STATIONS
Document Type and Number:
WIPO Patent Application WO2002078314
Kind Code:
A3
Abstract:
In one embodiment, a mobile station (150) such as a dual-mode, AMPS and CDMA, handset communicates with an AMPS base station (102)in a wireless communication system (100). The mobile station (150) includes an acoustic echo canceller (124), which can detect acoustic echo, for example, feedback from the handset speaker (126)to the handset microphone (128), during communication between themobile station (150) and the base station (102), and cancel or eliminate the acoustic echo. The mobile station (150) also includes a network echo suppressor (116) coupled to the acoustic echo canceller (124). For example, the network echo suppressor (116) can read a parameter (133) set by the acoustic echo canceller (124). The network echo suppressor (116) attenuates or mutes a network echo caused by portions of the communication returning to the mobile station (150) from the base station (102) after a network propagation delay. Coupling the network echo suppressor (116) to the acoustic echo canceller (124) ensures proper interaction between the network echo suppressor (116) and acoustic echo canceller (124).
More Like This:
| JPS5675764 | CONFERENCE TELEPHONE SET |
| WO/1995/006382 | A VOICE ACTIVITY DETECTOR FOR AN ECHO SUPPRESSOR AND AN ECHO SUPPRESSOR |
| WO/2014/193874 | ECHO CANCELLATION |
Inventors:
GUPTA SAMIR
OEI IVAN K
OEI IVAN K
Application Number:
PCT/US2002/009424
Publication Date:
March 20, 2003
Filing Date:
March 27, 2002
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
H04M9/08; (IPC1-7): H04M9/08
Foreign References:
| US5838787A | 1998-11-17 | |||
| US6185300B1 | 2001-02-06 |
Other References:
See also references of EP 1374547A2
Download PDF: