BR9612049A - Processo de cancelamento de eco e cancelador de eco - Google Patents
Processo de cancelamento de eco e cancelador de ecoInfo
- Publication number
- BR9612049A BR9612049A BR9612049A BR9612049A BR9612049A BR 9612049 A BR9612049 A BR 9612049A BR 9612049 A BR9612049 A BR 9612049A BR 9612049 A BR9612049 A BR 9612049A BR 9612049 A BR9612049 A BR 9612049A
- Authority
- BR
- Brazil
- Prior art keywords
- echo
- cancellation process
- canceller
- echo cancellation
- echo canceller
- Prior art date
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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9504520A SE505692C2 (sv) | 1995-12-18 | 1995-12-18 | Förfarande och anordning för ekosläckning genom skattning av effekt hos residualsignal |
PCT/SE1996/001610 WO1997023055A1 (en) | 1995-12-18 | 1996-12-06 | Method and device for echo cancellation using power estimation in a residual signal |
Publications (1)
Publication Number | Publication Date |
---|---|
BR9612049A true BR9612049A (pt) | 1999-07-13 |
Family
ID=20400627
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BR9612049A BR9612049A (pt) | 1995-12-18 | 1996-12-06 | Processo de cancelamento de eco e cancelador de eco |
Country Status (10)
Country | Link |
---|---|
US (1) | US6195430B1 (pt) |
EP (1) | EP0868787B1 (pt) |
JP (1) | JP2000502229A (pt) |
KR (1) | KR100308226B1 (pt) |
AU (1) | AU723722B2 (pt) |
BR (1) | BR9612049A (pt) |
CA (1) | CA2240726A1 (pt) |
DE (1) | DE69633458T2 (pt) |
SE (1) | SE505692C2 (pt) |
WO (1) | WO1997023055A1 (pt) |
Families Citing this family (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6160886A (en) * | 1996-12-31 | 2000-12-12 | Ericsson Inc. | Methods and apparatus for improved echo suppression in communications systems |
SE511073C2 (sv) | 1997-09-10 | 1999-08-02 | Ericsson Telefon Ab L M | Sätt och anordning för ekoestimering och undertryckning i telefonsystem |
GB2330745B (en) * | 1997-10-24 | 2002-08-21 | Mitel Corp | Nonlinear processor for acoustic echo canceller |
US6028929A (en) * | 1997-11-14 | 2000-02-22 | Tellabs Operations, Inc. | Echo canceller employing dual-H architecture having improved non-linear echo path detection |
US6198819B1 (en) * | 1997-11-14 | 2001-03-06 | Tellabs Operations, Inc. | Echo canceller having improved non-linear processor |
US6256384B1 (en) | 1997-12-02 | 2001-07-03 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for cancelling echo originating from a mobile terminal |
CA2245411A1 (en) * | 1998-08-20 | 2000-02-20 | Mitel Corporation | Echo canceller with compensation for codec limiting effects |
US6658107B1 (en) * | 1998-10-23 | 2003-12-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and apparatus for providing echo suppression using frequency domain nonlinear processing |
SE516143C2 (sv) | 1999-05-10 | 2001-11-26 | Ericsson Telefon Ab L M | Skattning av ren fördröjning |
US6687373B1 (en) * | 1999-08-24 | 2004-02-03 | Nortel Networks Limited | Heusristics for optimum beta factor and filter order determination in echo canceler systems |
US6694019B1 (en) * | 1999-08-26 | 2004-02-17 | Nortel Networks Limited | Method and apparatus for infinite return loss handler for network echo canceller |
US6438225B1 (en) * | 2000-01-13 | 2002-08-20 | Motorola, Inc. | Method and system for detecting and controlling severe echo |
JP4503158B2 (ja) * | 2000-09-25 | 2010-07-14 | 京セラ株式会社 | エコーキャンセラ |
US6766020B1 (en) * | 2001-02-23 | 2004-07-20 | 3Com Corporation | System and method for comfort noise generation |
KR100477638B1 (ko) * | 2001-09-11 | 2005-03-23 | 삼성전자주식회사 | 2d/3d 겸용 디스플레이 |
JP4282260B2 (ja) | 2001-11-20 | 2009-06-17 | 株式会社リコー | エコーキャンセラ |
US6961422B2 (en) * | 2001-12-28 | 2005-11-01 | Avaya Technology Corp. | Gain control method for acoustic echo cancellation and suppression |
US7242762B2 (en) * | 2002-06-24 | 2007-07-10 | Freescale Semiconductor, Inc. | Monitoring and control of an adaptive filter in a communication system |
US7388954B2 (en) * | 2002-06-24 | 2008-06-17 | Freescale Semiconductor, Inc. | Method and apparatus for tone indication |
US6961423B2 (en) | 2002-06-24 | 2005-11-01 | Freescale Semiconductor, Inc. | Method and apparatus for performing adaptive filtering |
US7215765B2 (en) * | 2002-06-24 | 2007-05-08 | Freescale Semiconductor, Inc. | Method and apparatus for pure delay estimation in a communication system |
US7672445B1 (en) * | 2002-11-15 | 2010-03-02 | Fortemedia, Inc. | Method and system for nonlinear echo suppression |
US7003099B1 (en) * | 2002-11-15 | 2006-02-21 | Fortmedia, Inc. | Small array microphone for acoustic echo cancellation and noise suppression |
JP4376793B2 (ja) * | 2003-01-08 | 2009-12-02 | エヌエックスピー ビー ヴィ | 特に電話におけるエコーを抑制するための装置および方法 |
US7099458B2 (en) * | 2003-12-12 | 2006-08-29 | Motorola, Inc. | Downlink activity and double talk probability detector and method for an echo canceler circuit |
US7046794B2 (en) | 2003-12-12 | 2006-05-16 | Motorola, Inc. | Double talk activity detector and method for an echo canceler circuit |
US7599483B2 (en) * | 2003-12-12 | 2009-10-06 | Temic Automotive Of North America, Inc. | Echo canceler circuit and method |
US7680265B2 (en) * | 2003-12-12 | 2010-03-16 | Continental Automotive Systems, Inc. | Echo canceler circuit and method |
FR2866494A1 (fr) * | 2004-02-18 | 2005-08-19 | Cit Alcatel | Dispositif de reduction d'echo par seuillage adaptable dynamiquement en phase de convergence |
US7523035B2 (en) * | 2004-07-26 | 2009-04-21 | Motorola, Inc. | Hands-free circuit and method for communicating with a wireless device |
DE602005008895D1 (de) * | 2005-02-11 | 2008-09-25 | Mitel Networks Corp | Verfahren zur Messung der Verzerrung und zur Bestimmung der Schwelle des Restechos in Verbindungsleitungen |
JP4509126B2 (ja) * | 2007-01-24 | 2010-07-21 | 沖電気工業株式会社 | エコーキャンセラ及びエコーキャンセル方法 |
JP4877083B2 (ja) * | 2007-06-12 | 2012-02-15 | 沖電気工業株式会社 | 残留エコー抑圧制御装置、方法及びプログラム |
JP4456622B2 (ja) * | 2007-07-25 | 2010-04-28 | 沖電気工業株式会社 | ダブルトーク検出器、ダブルトーク検出方法及びエコーキャンセラ |
US8792649B2 (en) * | 2008-09-24 | 2014-07-29 | Mitsubishi Electric Corporation | Echo canceller used for voice communication |
US8861713B2 (en) * | 2013-03-17 | 2014-10-14 | Texas Instruments Incorporated | Clipping based on cepstral distance for acoustic echo canceller |
JP6446893B2 (ja) * | 2014-07-31 | 2019-01-09 | 富士通株式会社 | エコー抑圧装置、エコー抑圧方法及びエコー抑圧用コンピュータプログラム |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0106640B1 (en) * | 1982-10-15 | 1986-07-16 | British Telecommunications | Noise control circuit |
IT1208769B (it) * | 1983-10-12 | 1989-07-10 | Cselt Centro Studi Lab Telecom | Teristiche varianti nel tempo procedimento e dispositivo per la cancellazione numerica dell eco generato in collegamenti con carat |
FR2564667B1 (fr) * | 1984-05-15 | 1986-09-19 | Trt Telecom Radio Electr | Dispositif de commande d'un annuleur d'echo et d'un ecreteur de centre |
US4894820A (en) * | 1987-03-24 | 1990-01-16 | Oki Electric Industry Co., Ltd. | Double-talk detection in an echo canceller |
JP2608074B2 (ja) * | 1987-11-02 | 1997-05-07 | 沖電気工業株式会社 | エコーキャンセラ |
US4879745A (en) * | 1988-10-12 | 1989-11-07 | Ibm Corporation | Half-duplex speakerphone |
US5157653A (en) | 1990-08-03 | 1992-10-20 | Coherent Communications Systems Corp. | Residual echo elimination with proportionate noise injection |
NL9002790A (nl) * | 1990-12-18 | 1992-07-16 | Philips Nv | Echocompensator met verbeterde dubbelspraak detectie. |
US5274705A (en) * | 1991-09-24 | 1993-12-28 | Tellabs Inc. | Nonlinear processor for an echo canceller and method |
US5327495A (en) * | 1992-10-23 | 1994-07-05 | Dsc Communications Corporation | Apparatus and method for controlling an echo canceler |
JP2626437B2 (ja) | 1992-12-28 | 1997-07-02 | 日本電気株式会社 | 残留エコー制御装置 |
US5475731A (en) * | 1994-01-07 | 1995-12-12 | Ericsson Inc. | Echo-canceling system and method using echo estimate to modify error signal |
-
1995
- 1995-12-18 SE SE9504520A patent/SE505692C2/sv not_active IP Right Cessation
-
1996
- 1996-12-06 AU AU11552/97A patent/AU723722B2/en not_active Expired
- 1996-12-06 CA CA002240726A patent/CA2240726A1/en not_active Abandoned
- 1996-12-06 JP JP9522699A patent/JP2000502229A/ja active Pending
- 1996-12-06 WO PCT/SE1996/001610 patent/WO1997023055A1/en active IP Right Grant
- 1996-12-06 BR BR9612049A patent/BR9612049A/pt not_active IP Right Cessation
- 1996-12-06 EP EP96942704A patent/EP0868787B1/en not_active Expired - Lifetime
- 1996-12-06 KR KR1019980704390A patent/KR100308226B1/ko not_active IP Right Cessation
- 1996-12-06 DE DE69633458T patent/DE69633458T2/de not_active Expired - Lifetime
-
1998
- 1998-06-17 US US09/098,506 patent/US6195430B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
KR20000064382A (ko) | 2000-11-06 |
SE9504520L (sv) | 1997-06-19 |
DE69633458D1 (de) | 2004-10-28 |
CA2240726A1 (en) | 1997-06-26 |
AU1155297A (en) | 1997-07-14 |
AU723722B2 (en) | 2000-09-07 |
SE505692C2 (sv) | 1997-09-29 |
KR100308226B1 (ko) | 2001-11-02 |
JP2000502229A (ja) | 2000-02-22 |
SE9504520D0 (sv) | 1995-12-18 |
DE69633458T2 (de) | 2005-10-13 |
WO1997023055A1 (en) | 1997-06-26 |
EP0868787A1 (en) | 1998-10-07 |
EP0868787B1 (en) | 2004-09-22 |
US6195430B1 (en) | 2001-02-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
BR9612049A (pt) | Processo de cancelamento de eco e cancelador de eco | |
DE69522088D1 (de) | Teilbandechokompensator | |
DE69636361D1 (de) | Akustischer Echokompensator | |
DE69429947D1 (de) | Echokompensator | |
DE69632851D1 (de) | Akustischer Teilband-Echokompensator | |
FR2762467B1 (fr) | Procede d'annulation d'echo acoustique multi-voies et annuleur d'echo acoustique multi-voies | |
DE69621528D1 (de) | Anti-inflamatorische agenzien | |
DE69835644D1 (de) | Akustischer Echokompensator | |
DE69634027D1 (de) | Akustischer Teilband-Echokompensator | |
PT828506E (pt) | Agentes endoparasiticidas | |
BR9607508A (pt) | Processo de supressão de eco em um sistema de telecomunicação | |
DE19882141T1 (de) | Adaptive Doppelfilter-Echolöschung | |
DE69632426D1 (de) | Akustischer Echokompensator | |
DE69534663D1 (de) | Echo-Löscher | |
DE69631708D1 (de) | Einrichtung zur Echounterdrückung | |
DE69730428D1 (de) | Echokompensatorsystem | |
EP1022865A4 (en) | ECHOUNTERDRUCKS AND ECHOUNTERPRESSION PROCESSES | |
DE69633454D1 (de) | Adaptives echounterdrückungsverfahren | |
NO952670D0 (no) | Ekkokompensator | |
DE69830959D1 (de) | Echokompensator | |
KR970022490U (ko) | 자동차용 글로브박스구조 | |
KR970046279U (ko) | 자동차의 노이즈 제거장치 | |
KR960027756U (ko) | 자동차용 전자릴레이 | |
KR970014441U (ko) | 전자렌지 소음 상쇄장치 | |
KR960038898U (ko) | 카폰용 송화장치 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
FF | Decision: intention to grant | ||
FG9A | Patent or certificate of addition granted | ||
B21A | Patent or certificate of addition expired [chapter 21.1 patent gazette] |