ATE78641T1 - Echokompensation. - Google Patents

Echokompensation.

Info

Publication number
ATE78641T1
ATE78641T1 AT88305951T AT88305951T ATE78641T1 AT E78641 T1 ATE78641 T1 AT E78641T1 AT 88305951 T AT88305951 T AT 88305951T AT 88305951 T AT88305951 T AT 88305951T AT E78641 T1 ATE78641 T1 AT E78641T1
Authority
AT
Austria
Prior art keywords
samples
signals
real
phase
complex
Prior art date
Application number
AT88305951T
Other languages
English (en)
Inventor
Fuyun Ling
Original Assignee
Codex Corp
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 Codex Corp filed Critical Codex Corp
Application granted granted Critical
Publication of ATE78641T1 publication Critical patent/ATE78641T1/de

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
    • H04B3/232—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 phase shift, phase roll or frequency offset correction
    • 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
    • H04B3/237—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 two adaptive filters, e.g. for near end and for end echo cancelling
    • 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
    • H04B3/238—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 initial training sequence

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
AT88305951T 1987-07-02 1988-06-30 Echokompensation. ATE78641T1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/069,250 US4813073A (en) 1987-07-02 1987-07-02 Echo cancellation
EP88305951A EP0299648B1 (de) 1987-07-02 1988-06-30 Echokompensation

Publications (1)

Publication Number Publication Date
ATE78641T1 true ATE78641T1 (de) 1992-08-15

Family

ID=22087702

Family Applications (1)

Application Number Title Priority Date Filing Date
AT88305951T ATE78641T1 (de) 1987-07-02 1988-06-30 Echokompensation.

Country Status (6)

Country Link
US (1) US4813073A (de)
EP (1) EP0299648B1 (de)
JP (2) JPS6465936A (de)
AT (1) ATE78641T1 (de)
CA (1) CA1332451C (de)
DE (1) DE3872966T2 (de)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1338218C (en) * 1988-03-17 1996-04-02 Yoshinori Tanaka Echo canceller
EP0388493A1 (de) * 1989-03-22 1990-09-26 Sa Telindus Nv Digitaler Echokompensator für Vollduplexmodem mit Frequenzversatznachführung
US4987569A (en) * 1989-04-05 1991-01-22 Codex Corporation Fast training echo canceller
US4947425A (en) * 1989-10-27 1990-08-07 At&T Bell Laboratories Echo measurement arrangement
US5001747A (en) * 1990-01-22 1991-03-19 Racal Data Communications Inc. Frequency offset estimator for data modem
US5117418A (en) * 1990-11-09 1992-05-26 Intelligent Modem Corporation Frequency domain adaptive echo canceller for full-duplex data transmission
US5163044A (en) * 1991-01-02 1992-11-10 At&T Bell Laboratories Use of a fractionally spaced equalizer to perform echo cancellation in a full-duplex modem
US5189664A (en) * 1991-02-19 1993-02-23 Silicon Systems, Inc. Listener echo cancellation
US5303228A (en) * 1991-08-27 1994-04-12 Industrial Technology Research Institute A far-end echo canceller with a digital filter for simulating a far end echo containing a frequency offset
US5319636A (en) * 1991-11-14 1994-06-07 Codex Corporation Device and method for linear listener echo cancellation
IT1254819B (it) * 1992-02-24 1995-10-11 Sits Soc It Telecom Siemens Procedimento e dispositivo per la cancellazione numerica adattativa dell'eco generato in collegamenti telefonici non stazionari
US5764753A (en) * 1995-09-29 1998-06-09 Crystal Semiconductor Corp. Half-duplex controller
JPH10135875A (ja) * 1996-10-28 1998-05-22 Nec Corp エコーキャンセラ装置
US5864545A (en) * 1996-12-06 1999-01-26 Altocom, Inc. System and method for improving convergence during modem training and reducing computational load during steady-state modem operations
RU2147791C1 (ru) * 1998-08-17 2000-04-20 Пензенский научно-исследовательский электротехнический институт Дуплексный модем
US6278785B1 (en) * 1999-09-21 2001-08-21 Acoustic Technologies, Inc. Echo cancelling process with improved phase control
US7164659B2 (en) * 1999-12-09 2007-01-16 Broadcom Corporation Adaptive gain control based on echo canceller performance information
US7409195B2 (en) * 2000-09-08 2008-08-05 Nebo Wireless, Llc Wireless modem
US6751474B1 (en) 2000-09-26 2004-06-15 Nebo Wireless, Llc Wireless modem
RU2218666C2 (ru) * 2001-10-15 2003-12-10 Федеральное государственное унитарное предприятие "Пензенский научно-исследовательский электротехнический институт" Цифровой модем
US20040087321A1 (en) * 2002-11-06 2004-05-06 Ernie Lin Circuitry to establish a wireless communication link
KR101128557B1 (ko) * 2005-08-23 2012-04-20 ？란 인코포레이티드 신호 에뮬레이션용 방법 및 시스템
RU2345373C1 (ru) * 2007-11-19 2009-01-27 Государственное образовательное учреждение высшего профессионального образования "Пензенский государственный университет" (ПГУ) Способ измерения ухода частоты несущей в сигнале дальнего эха в коммутируемом двухпроводном канале телефонной сети общего пользования
US7928392B1 (en) * 2009-10-07 2011-04-19 T-Ray Science Inc. Systems and methods for blind echo cancellation
CN109767669A (zh) * 2019-03-14 2019-05-17 扬州大学 一种智能数字电子综合实训系统
CN120812717A (zh) * 2024-04-10 2025-10-17 华为技术有限公司 一种通信方法和通信装置

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US31253A (en) * 1861-01-29 Machine
US3789165A (en) * 1972-04-24 1974-01-29 Communications Satellite Corp Echo canceller with variable threshold
JPS5226973B2 (de) * 1973-01-19 1977-07-18
USRE31253E (en) 1976-09-07 1983-05-24 Bell Telephone Laboratories, Incorporated Echo cancellation in two-wire, two-way data transmission systems
SE416367B (sv) * 1976-09-07 1980-12-15 Western Electric Co Ekoelimineringsanordning
US4074086A (en) * 1976-09-07 1978-02-14 Bell Telephone Laboratories, Incorporated Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission
US4072830A (en) * 1976-10-04 1978-02-07 Bell Telephone Laboratories, Incorporated Variable phase shifter for adaptive echo cancellers
IT1115559B (it) * 1978-08-29 1986-02-03 Cselt Centro Studi Lab Telecom Procedimento e dispositivo per la cancellazione numerica dell eco
FR2479617A1 (fr) * 1980-03-26 1981-10-02 Trt Telecom Radio Electr Annuleur d'echo pour signal d'echo a phase variable
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
US4344126A (en) * 1980-10-03 1982-08-10 Ford Motor Company Low ripple D.C. power supply
US4464545A (en) * 1981-07-13 1984-08-07 Bell Telephone Laboratories, Incorporated Echo canceller
DE3173306D1 (en) * 1981-09-08 1986-02-06 Ibm Data receiving apparatus with listener echo canceller
FR2517905B1 (fr) * 1981-12-09 1985-11-29 Telecommunications Sa Dispositif d'initialisation pour annuleur d'echo et son application aux echos lointains
US4587382A (en) * 1982-07-29 1986-05-06 Gte Lenkurt Incorporated Echo canceller using end delay measurement
FR2538975A1 (fr) * 1982-12-30 1984-07-06 Trt Telecom Radio Electr Procede utilise dans un dispositif d'annulation d'echo pour la mesure d'un retard d'echo et dispositif de mise en oeuvre de ce procede
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
US4628157A (en) * 1984-09-07 1986-12-09 At&T Bell Laboratories Bidirectional adaptive voice frequency repeater

Also Published As

Publication number Publication date
CA1332451C (en) 1994-10-11
JPS6465936A (en) 1989-03-13
EP0299648A1 (de) 1989-01-18
US4813073A (en) 1989-03-14
JP2000040984A (ja) 2000-02-08
EP0299648B1 (de) 1992-07-22
DE3872966T2 (de) 1993-01-14
DE3872966D1 (de) 1992-08-27

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Legal Events

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RER Ceased as to paragraph 5 lit. 3 law introducing patent treaties