CA2414636A1 - Method of capturing constant echo path information in a full duplex speakerphone - Google Patents
Method of capturing constant echo path information in a full duplex speakerphone Download PDFInfo
- Publication number
- CA2414636A1 CA2414636A1 CA 2414636 CA2414636A CA2414636A1 CA 2414636 A1 CA2414636 A1 CA 2414636A1 CA 2414636 CA2414636 CA 2414636 CA 2414636 A CA2414636 A CA 2414636A CA 2414636 A1 CA2414636 A1 CA 2414636A1
- Authority
- CA
- Canada
- Prior art keywords
- capturing
- coefficients
- full duplex
- echo canceller
- path information
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
- H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Telephone Function (AREA)
Abstract
A method of improving convergence of an echo canceller in a full duplex speakerphone, wherein the echo canceller includes LEC (Line Echo Canceller) and AEC (Acoustic Echo Canceller) portions, comprising the steps of capturing coefficients during operation, storing the coefficients, and utilizing the stored coefficients as default values during start-up of a subsequent call. According to the method of the present invention, the amount of echo cancellation necessary to provoke a save of the coefficients decreases with time when it is not achieved by the system despite the presence of a reference signal (i.e. speakerphone signal).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002414636A CA2414636C (en) | 2002-12-18 | 2002-12-18 | Method of capturing constant echo path information in a full duplex speakerphone |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002414636A CA2414636C (en) | 2002-12-18 | 2002-12-18 | Method of capturing constant echo path information in a full duplex speakerphone |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2414636A1 true CA2414636A1 (en) | 2004-06-18 |
CA2414636C CA2414636C (en) | 2006-09-12 |
Family
ID=32514066
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002414636A Expired - Lifetime CA2414636C (en) | 2002-12-18 | 2002-12-18 | Method of capturing constant echo path information in a full duplex speakerphone |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2414636C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2416971A (en) * | 2004-08-04 | 2006-02-08 | Mitel Networks Corp | Calculating an expected echo return loss enhancement (erle) in an echo canceller |
-
2002
- 2002-12-18 CA CA002414636A patent/CA2414636C/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2416971A (en) * | 2004-08-04 | 2006-02-08 | Mitel Networks Corp | Calculating an expected echo return loss enhancement (erle) in an echo canceller |
US7724893B2 (en) | 2004-08-04 | 2010-05-25 | Mitel Networks Corporation | Method of adaptation step control in echo cancellers |
Also Published As
Publication number | Publication date |
---|---|
CA2414636C (en) | 2006-09-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |
Effective date: 20221219 |
|
MKEX | Expiry |
Effective date: 20221219 |