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 PDF

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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
Application number
CA 2414636
Other languages
French (fr)
Other versions
CA2414636C (en
Inventor
Franck Beaucoup
Michael Tetelbaum
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitel Networks Corp
Original Assignee
Mitel Knowledge Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitel Knowledge Corp filed Critical Mitel Knowledge Corp
Priority to CA002414636A priority Critical patent/CA2414636C/en
Publication of CA2414636A1 publication Critical patent/CA2414636A1/en
Application granted granted Critical
Publication of CA2414636C publication Critical patent/CA2414636C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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).
CA002414636A 2002-12-18 2002-12-18 Method of capturing constant echo path information in a full duplex speakerphone Expired - Lifetime CA2414636C (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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Effective date: 20221219

MKEX Expiry

Effective date: 20221219