FI891802A - Eko upphaevare. - Google Patents

Eko upphaevare. Download PDF

Info

Publication number
FI891802A
FI891802A FI891802A FI891802A FI891802A FI 891802 A FI891802 A FI 891802A FI 891802 A FI891802 A FI 891802A FI 891802 A FI891802 A FI 891802A FI 891802 A FI891802 A FI 891802A
Authority
FI
Finland
Prior art keywords
upphaevare
eco
eco upphaevare
Prior art date
Application number
FI891802A
Other languages
English (en)
Finnish (fi)
Other versions
FI891802A0 (fi
Inventor
Ian Juso Dedic
Original Assignee
Plessey Telecomm
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 Plessey Telecomm filed Critical Plessey Telecomm
Publication of FI891802A0 publication Critical patent/FI891802A0/fi
Publication of FI891802A publication Critical patent/FI891802A/fi

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Analogue/Digital Conversion (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Dc Digital Transmission (AREA)
FI891802A 1987-08-14 1989-04-14 Eko upphaevare. FI891802A (fi)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878719307A GB8719307D0 (en) 1987-08-14 1987-08-14 Echo canceller
PCT/GB1988/000626 WO1989001723A1 (en) 1987-08-14 1988-07-29 Echo canceller

Publications (2)

Publication Number Publication Date
FI891802A0 FI891802A0 (fi) 1989-04-14
FI891802A true FI891802A (fi) 1989-04-14

Family

ID=10622326

Family Applications (1)

Application Number Title Priority Date Filing Date
FI891802A FI891802A (fi) 1987-08-14 1989-04-14 Eko upphaevare.

Country Status (11)

Country Link
US (1) US4972406A (zh)
EP (1) EP0303363A3 (zh)
JP (1) JPH02500237A (zh)
KR (1) KR890702347A (zh)
CN (1) CN1014291B (zh)
AU (1) AU592937B2 (zh)
DK (1) DK182789D0 (zh)
FI (1) FI891802A (zh)
GB (2) GB8719307D0 (zh)
PT (1) PT88218A (zh)
WO (1) WO1989001723A1 (zh)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8719307D0 (en) * 1987-08-14 1987-09-23 Gen Electric Co Plc Echo canceller
EP0388493A1 (en) * 1989-03-22 1990-09-26 Sa Telindus Nv Digital echo canceller for full-duplex modem with frequency offset tracking
JP2853455B2 (ja) * 1992-05-15 1999-02-03 ケイディディ株式会社 エコーキャンセラ
US5526347A (en) * 1992-11-02 1996-06-11 Advanced Micro Devices, Inc. Decorrelation controller for an adaptive echo cancellor
US5396517A (en) * 1993-03-04 1995-03-07 Adtran Transversal filter useable in echo canceler, decision feedback equalizer applications for minimizing non-linear distortion in signals conveyed over full duplex two-wire communication link
FR2710211A1 (fr) * 1993-09-13 1995-03-24 Trt Telecom Radio Electr Dispositif de détection de rupture de ligne et modem comportant un tel dispositif.
DE19543666A1 (de) * 1995-11-23 1997-05-28 Sel Alcatel Ag Echokompensator
KR100200635B1 (ko) * 1996-10-28 1999-06-15 윤종용 화상회의 시스템에서의 반향제어 장치 및 제어방법
CN1066331C (zh) * 1997-11-10 2001-05-30 王文献 以亮菌为原料制备的液体口服药物
KR100436480B1 (ko) * 2000-03-08 2004-06-24 엘지전자 주식회사 교환 시스템에서 적응형 반향 제거기의 테이블 관리 방법
US7079498B2 (en) * 2002-06-14 2006-07-18 Intel Corporation Method, apparatus, and system for reducing memory requirements for echo cancellers
US7554933B2 (en) * 2004-01-09 2009-06-30 Realtek Semiconductor Corp. Echo cancellation device for full duplex communication systems
US7555117B2 (en) * 2005-07-12 2009-06-30 Acoustic Technologies, Inc. Path change detector for echo cancellation

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1434239A (en) * 1972-08-10 1976-05-05 Siemens Ag Echo cancellers
NO140648C (no) * 1977-10-24 1983-03-29 Elektrisk Bureau As Direktiv kobler.
FR2490901A1 (fr) * 1980-09-19 1982-03-26 Trt Telecom Radio Electr Annuleur d'echo numerique muni d'un convertisseur analogique-numerique a dynamique reglable
FR2496364A1 (fr) * 1980-12-17 1982-06-18 Trt Telecom Radio Electr Annuleur d'echo pour transmission telephonique par voies numeriques mettant en oeuvre une loi de codage pseudo-logarithmique
CA1186764A (en) * 1982-06-23 1985-05-07 Akira Kanemasa Echo canceler
GB2123258A (en) * 1982-06-25 1984-01-25 Philips Electronic Associated Digital duplex communication system
GB2123259A (en) * 1982-06-25 1984-01-25 Philips Electronic Associated Digital duplex communication system
EP0122594A3 (en) * 1983-04-18 1986-09-10 International Standard Electric Corporation Line circuit with echo compensation
GB8406846D0 (en) * 1984-03-16 1984-04-18 British Telecomm Digital filters
EP0163298B1 (en) * 1984-05-30 1992-09-30 Hitachi, Ltd. Pcm coder/decoder with two-wire/four-wire conversion
EP0167677B1 (en) * 1984-07-13 1989-03-08 BELL TELEPHONE MANUFACTURING COMPANY Naamloze Vennootschap Signal processing arrangement
DE3515832A1 (de) * 1985-05-02 1986-11-06 Siemens AG, 1000 Berlin und 8000 München Hybrider echokompensator
DE3533867A1 (de) * 1985-09-23 1987-03-26 Siemens Ag Verfahren zur echokompensation
US4791405A (en) * 1986-11-28 1988-12-13 Motorola, Inc. Data converter for directly providing outputs in two's complement code
GB8719307D0 (en) * 1987-08-14 1987-09-23 Gen Electric Co Plc Echo canceller

Also Published As

Publication number Publication date
KR890702347A (ko) 1989-12-23
US4972406A (en) 1990-11-20
WO1989001723A1 (en) 1989-02-23
JPH02500237A (ja) 1990-01-25
EP0303363A3 (en) 1989-06-07
CN1014291B (zh) 1991-10-09
DK182789A (da) 1989-04-14
PT88218A (pt) 1989-06-30
GB8719307D0 (en) 1987-09-23
EP0303363A2 (en) 1989-02-15
FI891802A0 (fi) 1989-04-14
AU2057188A (en) 1989-02-16
DK182789D0 (da) 1989-04-14
GB8816069D0 (en) 1988-08-10
GB2208779B (en) 1991-01-30
AU592937B2 (en) 1990-01-25
GB2208779A (en) 1989-04-12
CN1031915A (zh) 1989-03-22

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Legal Events

Date Code Title Description
MM Patent lapsed

Owner name: GEC PLESSEY TELECOMMUNICATIONS LIMITED