DE3585034D1 - Verfahren zur bestimmung einer flachen echopfadverzoegerung und dieses verfahren verwendender echokompensator. - Google Patents
Verfahren zur bestimmung einer flachen echopfadverzoegerung und dieses verfahren verwendender echokompensator.Info
- Publication number
- DE3585034D1 DE3585034D1 DE8585430038T DE3585034T DE3585034D1 DE 3585034 D1 DE3585034 D1 DE 3585034D1 DE 8585430038 T DE8585430038 T DE 8585430038T DE 3585034 T DE3585034 T DE 3585034T DE 3585034 D1 DE3585034 D1 DE 3585034D1
- Authority
- DE
- Germany
- Prior art keywords
- samples
- blocks
- block
- length
- echo
- 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.)
- Expired - Fee Related
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 (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP85430038A EP0221221B1 (de) | 1985-10-30 | 1985-10-30 | Verfahren zur Bestimmung einer flachen Echopfadverzögerung und dieses Verfahren verwendender Echokompensator |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3585034D1 true DE3585034D1 (de) | 1992-02-06 |
Family
ID=8194585
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8585430038T Expired - Fee Related DE3585034D1 (de) | 1985-10-30 | 1985-10-30 | Verfahren zur bestimmung einer flachen echopfadverzoegerung und dieses verfahren verwendender echokompensator. |
Country Status (4)
Country | Link |
---|---|
US (1) | US4764955A (de) |
EP (1) | EP0221221B1 (de) |
JP (1) | JPS62107533A (de) |
DE (1) | DE3585034D1 (de) |
Families Citing this family (48)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0427713A4 (en) * | 1987-03-27 | 1992-03-11 | Universal Data Systems, Inc. | Modem with improved remote echo location and cancellation |
JPH0195609A (ja) * | 1987-10-08 | 1989-04-13 | Oki Electric Ind Co Ltd | 全二重モデム |
US4947425A (en) * | 1989-10-27 | 1990-08-07 | At&T Bell Laboratories | Echo measurement arrangement |
EP0518383B1 (de) * | 1991-06-13 | 1997-09-03 | Nec Corporation | Verfahren und Einrichtung zur Echokompensation in einem digitalen Fernmeldesystem |
US5307405A (en) * | 1992-09-25 | 1994-04-26 | Qualcomm Incorporated | Network echo canceller |
US5410595A (en) * | 1992-11-12 | 1995-04-25 | Motorola, Inc. | Apparatus and method for noise reduction for a full-duplex speakerphone or the like |
WO1994014248A1 (en) * | 1992-12-07 | 1994-06-23 | Telstra Corporation Limited | Far end echo canceller |
US5535204A (en) * | 1993-01-08 | 1996-07-09 | Multi-Tech Systems, Inc. | Ringdown and ringback signalling for a computer-based multifunction personal communications system |
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 |
US7082106B2 (en) | 1993-01-08 | 2006-07-25 | Multi-Tech Systems, Inc. | Computer-based multi-media communications system and method |
US5453986A (en) * | 1993-01-08 | 1995-09-26 | Multi-Tech Systems, Inc. | Dual port interface for a computer-based multifunction personal communication system |
US5617423A (en) * | 1993-01-08 | 1997-04-01 | Multi-Tech Systems, Inc. | Voice over data modem with selectable voice compression |
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 |
US5812534A (en) * | 1993-01-08 | 1998-09-22 | Multi-Tech Systems, Inc. | Voice over data conferencing for a 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 |
US5452289A (en) * | 1993-01-08 | 1995-09-19 | Multi-Tech Systems, Inc. | Computer-based multifunction personal communications system |
US6009082A (en) * | 1993-01-08 | 1999-12-28 | Multi-Tech Systems, Inc. | Computer-based multifunction personal communication system with caller ID |
FI935834A (fi) * | 1993-12-23 | 1995-06-24 | Nokia Telecommunications Oy | Menetelmä kaikukohtaan sovittautumiseksi kaiunpoistajassa |
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 |
ATE235763T1 (de) * | 1994-05-06 | 2003-04-15 | Nippon Telegraph & Telephone | Verfahren zur echokompensation und echopfadschätzung |
US5790632A (en) * | 1994-09-30 | 1998-08-04 | Qualcom Incorporated | Method and apparatus for echo canceling accounting for companding induced quantization error |
US5587998A (en) * | 1995-03-03 | 1996-12-24 | At&T | Method and apparatus for reducing residual far-end echo in voice communication networks |
US5646990A (en) * | 1995-09-21 | 1997-07-08 | Rockwell International Corporation | Efficient speakerphone anti-howling system |
US5675644A (en) * | 1995-09-26 | 1997-10-07 | Qualcomm Incorporated | Method and apparatus for canceling echo accounting for delay variations |
US6125179A (en) * | 1995-12-13 | 2000-09-26 | 3Com Corporation | Echo control device with quick response to sudden echo-path change |
US5943645A (en) * | 1996-12-19 | 1999-08-24 | Northern Telecom Limited | Method and apparatus for computing measures of echo |
JP3097586B2 (ja) * | 1997-03-06 | 2000-10-10 | 日本電気株式会社 | 信号検出器 |
SE516143C2 (sv) | 1999-05-10 | 2001-11-26 | Ericsson Telefon Ab L M | Skattning av ren fördröjning |
US6771701B1 (en) * | 1999-05-12 | 2004-08-03 | Infineon Technologies North America Corporation | Adaptive filter divergence control in echo cancelers by means of amplitude distribution evaluation with configurable hysteresis |
US6421443B1 (en) * | 1999-07-23 | 2002-07-16 | Acoustic Technologies, Inc. | Acoustic and electronic echo cancellation |
EP1197060A1 (de) * | 1999-07-23 | 2002-04-17 | Acoustic Technologies, Inc. | Akustische und elektronische echoentzerrung unter verwendung einer hochauflösenden verzögerungsleitung |
US7164659B2 (en) * | 1999-12-09 | 2007-01-16 | Broadcom Corporation | Adaptive gain control based on echo canceller performance information |
US6606382B2 (en) | 2000-01-27 | 2003-08-12 | Qualcomm Incorporated | System and method for implementation of an echo canceller |
JP3693588B2 (ja) | 2000-11-01 | 2005-09-07 | 富士通株式会社 | エコー抑制システム |
GB0204057D0 (en) * | 2002-02-21 | 2002-04-10 | Tecteon Plc | Echo detector having correlator with preprocessing |
US7107303B2 (en) * | 2002-05-23 | 2006-09-12 | Analog Devices, Inc. | Sparse echo canceller |
AU2003247408A1 (en) * | 2002-05-23 | 2003-12-12 | Analog Devices, Inc. | Time delay estimation for equalisation |
US6928160B2 (en) * | 2002-08-09 | 2005-08-09 | Acoustic Technology, Inc. | Estimating bulk delay in a telephone system |
US20040252652A1 (en) * | 2003-06-10 | 2004-12-16 | Alexander Berestesky | Cross correlation, bulk delay estimation, and echo cancellation |
US7249676B2 (en) * | 2003-08-07 | 2007-07-31 | Tg Tools United Company | Packaging, storage and display apparatus and system |
US7460498B2 (en) * | 2003-12-04 | 2008-12-02 | Adtran, Inc. | System and method for detecting anomalies along telecommunication lines |
JP4543896B2 (ja) * | 2004-11-18 | 2010-09-15 | 沖電気工業株式会社 | エコー除去方法、エコーキャンセラ及び電話中継装置 |
US20080219432A1 (en) * | 2005-06-01 | 2008-09-11 | Tecteon Pic | Echo Delay Detector |
JP4692291B2 (ja) | 2006-01-13 | 2011-06-01 | 沖電気工業株式会社 | エコーキャンセラ |
GB2445059A (en) * | 2006-12-20 | 2008-06-25 | Oki Electric Ind Co Ltd | Echo canceller |
JP2008306535A (ja) * | 2007-06-08 | 2008-12-18 | Sony Corp | 音声信号処理装置、遅延時間の設定方法 |
KR101844514B1 (ko) * | 2016-09-02 | 2018-04-02 | 삼성전자주식회사 | 자기 공명 영상 장치 및 자기 공명 영상 획득 방법 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3535473A (en) * | 1966-10-31 | 1970-10-20 | Bell Telephone Labor Inc | Self-adjusting echo canceller |
US3721777A (en) * | 1971-11-26 | 1973-03-20 | Bell Telephone Labor Inc | Echo path delay simulator for use with adaptive echo cancellers |
FR2277470A1 (fr) * | 1974-07-03 | 1976-01-30 | Cit Alcatel | Dispositif de centrage d'un filtre transversal d'un annuleur d'echo |
DE3173306D1 (en) * | 1981-09-08 | 1986-02-06 | Ibm | Data receiving apparatus with listener echo canceller |
US4582963A (en) * | 1982-07-29 | 1986-04-15 | Rockwell International Corporation | Echo cancelling using adaptive bulk delay and filter |
US4587382A (en) * | 1982-07-29 | 1986-05-06 | Gte Lenkurt Incorporated | Echo canceller using end delay measurement |
US4628156A (en) * | 1982-12-27 | 1986-12-09 | International Business Machines Corporation | Canceller trained echo suppressor |
FR2540314A1 (fr) * | 1983-01-31 | 1984-08-03 | Trt Telecom Radio Electr | Procede d'initialisation des coefficients de filtres dans un dispositif d'annulation d'echos proche et lointain et dispositif de mise en oeuvre de ce procede |
US4562312A (en) * | 1983-02-17 | 1985-12-31 | At&T Bell Laboratories | Subsampling delay estimator for an echo canceler |
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 |
JPS60107928A (ja) * | 1983-11-16 | 1985-06-13 | Fujitsu Ltd | エコ−キヤンセラ− |
-
1985
- 1985-10-30 DE DE8585430038T patent/DE3585034D1/de not_active Expired - Fee Related
- 1985-10-30 EP EP85430038A patent/EP0221221B1/de not_active Expired
-
1986
- 1986-09-30 JP JP61230244A patent/JPS62107533A/ja active Granted
- 1986-10-16 US US06/919,724 patent/US4764955A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US4764955A (en) | 1988-08-16 |
EP0221221A1 (de) | 1987-05-13 |
JPH0472415B2 (de) | 1992-11-18 |
JPS62107533A (ja) | 1987-05-18 |
EP0221221B1 (de) | 1991-12-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |