CA2026558A1 - Filtre numerique adaptatif comportant un filtre passe-bas - Google Patents
Filtre numerique adaptatif comportant un filtre passe-basInfo
- Publication number
- CA2026558A1 CA2026558A1 CA2026558A CA2026558A CA2026558A1 CA 2026558 A1 CA2026558 A1 CA 2026558A1 CA 2026558 A CA2026558 A CA 2026558A CA 2026558 A CA2026558 A CA 2026558A CA 2026558 A1 CA2026558 A1 CA 2026558A1
- Authority
- CA
- Canada
- Prior art keywords
- pass filter
- low
- filter
- signal path
- adaptive digital
- 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
- 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
- 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
- H04B3/231—Echo cancellers using readout of a memory to provide the echo replica
-
- 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
- H04B3/234—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 using double talk detection
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP01-253004 | 1989-09-28 | ||
JP25300489A JPH03114311A (ja) | 1989-09-28 | 1989-09-28 | 適応フィルタのフィルタ係数学習方式 |
JP30742389A JPH03169126A (ja) | 1989-11-29 | 1989-11-29 | 適応フィルタ制御回路 |
JP01-307423 | 1989-11-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2026558A1 true CA2026558A1 (fr) | 1991-03-29 |
CA2026558C CA2026558C (fr) | 1994-07-05 |
Family
ID=26540985
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002026558A Expired - Fee Related CA2026558C (fr) | 1989-09-28 | 1990-09-28 | Filtre numerique adaptatif comportant un filtre passe-bas |
Country Status (3)
Country | Link |
---|---|
US (1) | US5146470A (fr) |
EP (1) | EP0420269A3 (fr) |
CA (1) | CA2026558C (fr) |
Families Citing this family (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04123621A (ja) * | 1990-09-14 | 1992-04-23 | Nippon Telegr & Teleph Corp <Ntt> | 反響消去装置 |
US5390364A (en) * | 1992-11-02 | 1995-02-14 | Harris Corporation | Least-mean squares adaptive digital filter havings variable size loop bandwidth |
US5453986A (en) * | 1993-01-08 | 1995-09-26 | Multi-Tech Systems, Inc. | Dual port interface for a computer-based multifunction personal communication system |
US6009082A (en) | 1993-01-08 | 1999-12-28 | Multi-Tech Systems, Inc. | Computer-based multifunction personal communication system with caller ID |
US5535204A (en) * | 1993-01-08 | 1996-07-09 | Multi-Tech Systems, Inc. | Ringdown and ringback signalling for a computer-based multifunction personal communications system |
US5452289A (en) * | 1993-01-08 | 1995-09-19 | Multi-Tech Systems, Inc. | Computer-based multifunction personal communications system |
US5617423A (en) | 1993-01-08 | 1997-04-01 | Multi-Tech Systems, Inc. | Voice over data modem with selectable voice compression |
US5546395A (en) * | 1993-01-08 | 1996-08-13 | Multi-Tech Systems, Inc. | Dynamic selection of compression rate for a voice compression algorithm in a voice over data modem |
US5864560A (en) | 1993-01-08 | 1999-01-26 | Multi-Tech Systems, Inc. | Method and apparatus for mode switching in a voice over data computer-based personal communications system |
US5754589A (en) | 1993-01-08 | 1998-05-19 | Multi-Tech Systems, Inc. | Noncompressed voice and data communication over modem for a computer-based multifunction personal communications system |
US5812534A (en) | 1993-01-08 | 1998-09-22 | Multi-Tech Systems, Inc. | Voice over data conferencing for a computer-based personal communications system |
FR2709623B1 (fr) * | 1993-08-31 | 1995-11-17 | Sgs Thomson Microelectronics | Filtre de boucle à verrouillage de phase numérique. |
US5757801A (en) | 1994-04-19 | 1998-05-26 | Multi-Tech Systems, Inc. | Advanced priority statistical multiplexer |
US5682386A (en) | 1994-04-19 | 1997-10-28 | Multi-Tech Systems, Inc. | Data/voice/fax compression multiplexer |
GB2325364B (en) * | 1994-09-20 | 1999-01-13 | Sony Uk Ltd | Digital signal processing |
DE19506324C1 (de) * | 1995-02-23 | 1995-10-12 | Siemens Ag | Adaptives Balancefilter |
EP0831479B1 (fr) | 1996-09-24 | 2001-12-05 | Hewlett-Packard Company, A Delaware Corporation | Appareil et méthodes de traitement de données |
DE69630784T2 (de) * | 1996-09-24 | 2004-09-30 | Hewlett-Packard Co. (N.D.Ges.D.Staates Delaware), Palo Alto | Datenverarbeitungsgerät und -verfahren |
US6570985B1 (en) * | 1998-01-09 | 2003-05-27 | Ericsson Inc. | Echo canceler adaptive filter optimization |
US6483872B2 (en) * | 1998-08-25 | 2002-11-19 | Stmicroelectronics, Inc. | Method and apparatus for reducing convergence time |
US6438225B1 (en) * | 2000-01-13 | 2002-08-20 | Motorola, Inc. | Method and system for detecting and controlling severe echo |
JP2001250115A (ja) * | 2000-03-03 | 2001-09-14 | Sony Computer Entertainment Inc | ディジタルフィルタ |
EP1271779A1 (fr) * | 2001-06-20 | 2003-01-02 | Motorola, Inc. | Filtre adaptatif à fréquences radio |
US7272375B2 (en) | 2004-06-30 | 2007-09-18 | Silicon Laboratories Inc. | Integrated low-IF terrestrial audio broadcast receiver and associated method |
US7483479B2 (en) * | 2004-09-16 | 2009-01-27 | Keyeye Communications | Scaled signal processing elements for reduced filter tap noise |
WO2007010727A1 (fr) * | 2005-07-15 | 2007-01-25 | Nec Corporation | Filtre numerique adaptatif, procede traitement de signaux, recepteur mf, et programme |
DE102005039621A1 (de) * | 2005-08-19 | 2007-03-01 | Micronas Gmbh | Verfahren und Vorrichtung zur adaptiven Reduktion von Rausch- und Hintergrundsignalen in einem sprachverarbeitenden System |
JP2007124048A (ja) * | 2005-10-25 | 2007-05-17 | Ntt Docomo Inc | 通信制御装置及び通信制御方法 |
RU2011103938A (ru) | 2011-02-03 | 2012-08-10 | ЭлЭсАй Корпорейшн (US) | Управление акустическими эхо-сигналами на основе временной области |
EP3193513B1 (fr) | 2014-10-17 | 2020-02-19 | Panasonic Intellectual Property Management Co., Ltd. | Appareil d'élimination de l'effet larsen et procédé d'élimination de l'effet larsen |
US10542153B2 (en) | 2017-08-03 | 2020-01-21 | Bose Corporation | Multi-channel residual echo suppression |
US10594869B2 (en) * | 2017-08-03 | 2020-03-17 | Bose Corporation | Mitigating impact of double talk for residual echo suppressors |
EP3692704B1 (fr) | 2017-10-03 | 2023-09-06 | Bose Corporation | Détecteur spatial de diaphonie |
US10964305B2 (en) | 2019-05-20 | 2021-03-30 | Bose Corporation | Mitigating impact of double talk for residual echo suppressors |
US11804233B2 (en) * | 2019-11-15 | 2023-10-31 | Qualcomm Incorporated | Linearization of non-linearly transformed signals |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3632905A (en) * | 1969-12-19 | 1972-01-04 | Bell Telephone Labor Inc | Method for improving the settling time of a transversal filter adaptive echo canceller |
US4535206A (en) * | 1980-04-09 | 1985-08-13 | At&T Bell Laboratories | Echo cancellation in two-wire full-duplex data transmission with estimation of far-end data components |
FR2501438A1 (fr) * | 1981-03-03 | 1982-09-10 | Thomson Csf Mat Tel | Dispositif de commande de convergence pour annuleur d'echo numerique |
JPS58107731A (ja) * | 1981-12-22 | 1983-06-27 | Fujitsu Ltd | エコ−キヤンセラ− |
US4591669A (en) * | 1984-09-26 | 1986-05-27 | At&T Bell Laboratories | Adaptive filter update gain normalization |
EP0280898A1 (fr) * | 1987-02-18 | 1988-09-07 | Siemens Aktiengesellschaft | Circuit pour la suppression des signaux d'échos |
US5042026A (en) * | 1987-03-03 | 1991-08-20 | Nec Corporation | Circuit for cancelling whole or part of a waveform using nonrecursive and recursive filters |
US4897832A (en) * | 1988-01-18 | 1990-01-30 | Oki Electric Industry Co., Ltd. | Digital speech interpolation system and speech detector |
FR2628918B1 (fr) * | 1988-03-15 | 1990-08-10 | France Etat | Dispositif annuleur d'echo a filtrage en sous-bandes de frequence |
US5029167A (en) * | 1989-09-13 | 1991-07-02 | Northern Telecom Limited | Coefficient storage reduction in adaptive filters in echo cancellers or decision feedback equalizers |
-
1990
- 1990-09-28 CA CA002026558A patent/CA2026558C/fr not_active Expired - Fee Related
- 1990-09-28 EP EP19900118683 patent/EP0420269A3/en not_active Ceased
- 1990-09-28 US US07/590,376 patent/US5146470A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0420269A2 (fr) | 1991-04-03 |
US5146470A (en) | 1992-09-08 |
CA2026558C (fr) | 1994-07-05 |
EP0420269A3 (en) | 1992-12-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed | ||
MKLA | Lapsed |
Effective date: 20070928 |