AU719761B2 - Echo cancellation method and circuit - Google Patents

Echo cancellation method and circuit Download PDF

Info

Publication number
AU719761B2
AU719761B2 AU70685/96A AU7068596A AU719761B2 AU 719761 B2 AU719761 B2 AU 719761B2 AU 70685/96 A AU70685/96 A AU 70685/96A AU 7068596 A AU7068596 A AU 7068596A AU 719761 B2 AU719761 B2 AU 719761B2
Authority
AU
Australia
Prior art keywords
echo
block
transfer function
correlation
sample values
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.)
Ceased
Application number
AU70685/96A
Other languages
English (en)
Other versions
AU7068596A (en
Inventor
Michael Maurer
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.)
Alcatel Lucent SAS
Original Assignee
Alcatel SA
Nokia Inc
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 Alcatel SA, Nokia Inc filed Critical Alcatel SA
Publication of AU7068596A publication Critical patent/AU7068596A/en
Assigned to ALCATEL reassignment ALCATEL Amend patent request/document other than specification (104) Assignors: ALCATEL ALSTHOM COMPAGNIE GENERALE D'ELECTRICITE
Application granted granted Critical
Publication of AU719761B2 publication Critical patent/AU719761B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Interface Circuits In Exchanges (AREA)
AU70685/96A 1995-11-23 1996-11-11 Echo cancellation method and circuit Ceased AU719761B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19543666A DE19543666A1 (de) 1995-11-23 1995-11-23 Echokompensator
DE19543666 1995-11-23

Publications (2)

Publication Number Publication Date
AU7068596A AU7068596A (en) 1997-05-29
AU719761B2 true AU719761B2 (en) 2000-05-18

Family

ID=7778213

Family Applications (1)

Application Number Title Priority Date Filing Date
AU70685/96A Ceased AU719761B2 (en) 1995-11-23 1996-11-11 Echo cancellation method and circuit

Country Status (9)

Country Link
US (1) US5799078A (OSRAM)
EP (1) EP0776118B1 (OSRAM)
JP (1) JPH09275368A (OSRAM)
AT (1) ATE185034T1 (OSRAM)
AU (1) AU719761B2 (OSRAM)
CA (1) CA2191118A1 (OSRAM)
DE (2) DE19543666A1 (OSRAM)
ES (1) ES2136958T3 (OSRAM)
NZ (1) NZ299785A (OSRAM)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19850271A1 (de) * 1998-10-31 2000-05-04 Alcatel Sa Verfahren zur Bestimmung eines Echokopplungsfaktors und der Echolaufzeit in einem bidirektionalen Telekommunikationssystem
US6754187B1 (en) 2000-04-06 2004-06-22 Inter-Tel, Inc. Performance enhancement system for digital PBX

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03173229A (ja) * 1989-12-01 1991-07-26 Nec Corp 双方向通話状態検出方式
US5062102A (en) * 1988-12-01 1991-10-29 Nec Corporation Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients
US5453976A (en) * 1989-05-12 1995-09-26 Gpt Limited Audio signal processor circuit

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8100650A (nl) * 1981-02-11 1982-09-01 Philips Nv Inrichting voor het corrigeren van pulsvervorming bij homochrone datatransmissie.
DE3120639C2 (de) * 1981-05-23 1986-10-23 ANT Nachrichtentechnik GmbH, 7150 Backnang Anordnung zur adaptiven Löschung von Sprecherechos
GB2123259A (en) * 1982-06-25 1984-01-25 Philips Electronic Associated Digital duplex communication system
GB2123258A (en) * 1982-06-25 1984-01-25 Philips Electronic Associated Digital duplex communication system
DE3431141A1 (de) * 1984-08-24 1986-03-06 Siemens Ag Transversalfilter-echokompensator fuer lange akustische echos
GB8719307D0 (en) * 1987-08-14 1987-09-23 Gen Electric Co Plc Echo canceller
DE3730234A1 (de) * 1987-09-09 1989-03-30 Telefonbau & Normalzeit Gmbh Verfahren zur echounterdrueckung
GB2225517B (en) * 1988-11-26 1993-03-31 Motorola Inc Telephone circuits
US5146494A (en) * 1989-07-31 1992-09-08 At&T Bell Laboratories Overlapping look-up-and-add echo canceller requiring a smaller memory size
US4977591A (en) * 1989-11-17 1990-12-11 Nynex Corporation Dual mode LMS nonlinear data echo canceller
NL9002790A (nl) * 1990-12-18 1992-07-16 Philips Nv Echocompensator met verbeterde dubbelspraak detectie.
EP0530423B1 (en) * 1991-09-06 1996-12-11 International Business Machines Corporation Adaptive echo cancellation method and device for implementing said method
DE69315636D1 (de) * 1992-07-27 1998-01-22 Texaco Development Corp Wasserstoffbehandlung von Kracknaphta
US5307405A (en) * 1992-09-25 1994-04-26 Qualcomm Incorporated Network echo canceller
JPH06216811A (ja) * 1993-01-20 1994-08-05 Toshiba Corp エコーキャンセラを備えた音声通信装置
DE4305256A1 (de) * 1993-02-20 1994-08-25 Sel Alcatel Ag Verfahren zum Verbessern der akustischen Rückhördämpfung von elektroakustischen Anlagen
FI935834A7 (fi) * 1993-12-23 1995-06-24 Nokia Corp Menetelmä kaikukohtaan sovittautumiseksi kaiunpoistajassa
JP3359460B2 (ja) * 1995-03-20 2002-12-24 沖電気工業株式会社 適応フィルタ及びエコーキャンセラ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5062102A (en) * 1988-12-01 1991-10-29 Nec Corporation Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients
US5453976A (en) * 1989-05-12 1995-09-26 Gpt Limited Audio signal processor circuit
JPH03173229A (ja) * 1989-12-01 1991-07-26 Nec Corp 双方向通話状態検出方式

Also Published As

Publication number Publication date
CA2191118A1 (en) 1997-05-24
JPH09275368A (ja) 1997-10-21
EP0776118A3 (OSRAM) 1997-06-25
AU7068596A (en) 1997-05-29
DE19543666A1 (de) 1997-05-28
DE59603143D1 (de) 1999-10-28
ES2136958T3 (es) 1999-12-01
EP0776118B1 (de) 1999-09-22
US5799078A (en) 1998-08-25
ATE185034T1 (de) 1999-10-15
EP0776118A2 (de) 1997-05-28
NZ299785A (en) 1998-07-28

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Legal Events

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FGA Letters patent sealed or granted (standard patent)