DE3684129D1 - Duplex-frequenzmultiplex-modemsystem mit echoloeschung. - Google Patents

Duplex-frequenzmultiplex-modemsystem mit echoloeschung.

Info

Publication number
DE3684129D1
DE3684129D1 DE8686310107T DE3684129T DE3684129D1 DE 3684129 D1 DE3684129 D1 DE 3684129D1 DE 8686310107 T DE8686310107 T DE 8686310107T DE 3684129 T DE3684129 T DE 3684129T DE 3684129 D1 DE3684129 D1 DE 3684129D1
Authority
DE
Germany
Prior art keywords
modem system
frequency multiplex
duplex frequency
multiplex modem
erase
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
Application number
DE8686310107T
Other languages
English (en)
Inventor
Takashi Kaku
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Application granted granted Critical
Publication of DE3684129D1 publication Critical patent/DE3684129D1/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals
    • 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
    • H04B3/235—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 combined with adaptive equaliser

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Transceivers (AREA)
  • Telephonic Communication Services (AREA)
DE8686310107T 1985-12-23 1986-12-23 Duplex-frequenzmultiplex-modemsystem mit echoloeschung. Expired - Fee Related DE3684129D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60289966A JPH0616592B2 (ja) 1985-12-23 1985-12-23 Ｆｄｍモデム

Publications (1)

Publication Number Publication Date
DE3684129D1 true DE3684129D1 (de) 1992-04-09

Family

ID=17750029

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8686310107T Expired - Fee Related DE3684129D1 (de) 1985-12-23 1986-12-23 Duplex-frequenzmultiplex-modemsystem mit echoloeschung.

Country Status (5)

Country Link
US (1) US4799214A (de)
EP (1) EP0229524B1 (de)
JP (1) JPH0616592B2 (de)
DE (1) DE3684129D1 (de)
ES (1) ES2029797T3 (de)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0666710B2 (ja) * 1986-04-07 1994-08-24 日本電気株式会社 エコ−キヤンセル方式
US5353305A (en) * 1988-06-17 1994-10-04 Fujitsu Limited Initial training apparatus for use in a transmitter and receiver apparatus
US4890316A (en) * 1988-10-28 1989-12-26 Walsh Dale M Modem for communicating at high speed over voice-grade telephone circuits
SE461367B (sv) * 1989-02-10 1990-02-05 Nokia Data Systems Naetarrangemang foer dataoeverfoering
US5063574A (en) * 1990-03-06 1991-11-05 Moose Paul H Multi-frequency differentially encoded digital communication for high data rate transmission through unequalized channels
USRE37802E1 (en) 1992-03-31 2002-07-23 Wi-Lan Inc. Multicode direct sequence spread spectrum
JP2763990B2 (ja) * 1992-08-12 1998-06-11 富士通株式会社 ２線式全二重モデム
US5579305A (en) * 1994-02-09 1996-11-26 U.S. Robotics, Inc. Asymmetric duplex modem utilizing narrow band echo cancellation
NO952856L (no) * 1994-07-20 1996-01-22 Siemens Ag Albis Sendefilter for en ekkokompensator
US5649010A (en) * 1994-07-20 1997-07-15 Siemens Schweiz Ag Send filter for an echo canceler
US5623225A (en) * 1995-12-22 1997-04-22 Motorola, Inc. Quadrature signal demodulation using quantizing and accumulating
US6192068B1 (en) 1996-10-03 2001-02-20 Wi-Lan Inc. Multicode spread spectrum communications system
AU5694298A (en) * 1996-12-19 1998-07-15 Thomson Consumer Electronics, Inc Return channel processing for a digital data communications system
US5917809A (en) * 1997-01-08 1999-06-29 Analog Devices, Inc. Asymmetric digital subscriber loop modem and method
US6078645A (en) * 1997-02-20 2000-06-20 Lucent Technologies Inc. Apparatus and method for monitoring full duplex data communications
SE9702316L (sv) * 1997-06-18 1998-12-19 Telia Ab VDSL-modem
US6480548B1 (en) * 1997-11-17 2002-11-12 Silicon Graphics, Inc. Spacial derivative bus encoder and decoder
US6181791B1 (en) * 1998-01-06 2001-01-30 Stmicroelectronics, Inc. Apparatus and method for reducing local interference in subscriber loop communication system
US6542477B1 (en) 1999-03-31 2003-04-01 Virata Corporation Digitally-tunable echo-cancelling analog front end for wireline communications devices
US6480532B1 (en) * 1999-07-13 2002-11-12 Stmicroelectronics, Inc. Echo cancellation for an ADSL modem
US7031420B1 (en) 1999-12-30 2006-04-18 Silicon Graphics, Inc. System and method for adaptively deskewing parallel data signals relative to a clock
US6754187B1 (en) 2000-04-06 2004-06-22 Inter-Tel, Inc. Performance enhancement system for digital PBX
FR2816147A1 (fr) * 2000-10-26 2002-05-03 St Microelectronics Sa Modulateur/demodulateur universel
DE10353494B4 (de) * 2003-11-11 2006-10-19 Siemens Ag Vorrichtung zur Echounterdrückung
US8027279B2 (en) * 2007-09-17 2011-09-27 Lantiq Deutschland Gmbh Echo cancellation
US9028986B2 (en) * 2009-01-07 2015-05-12 A123 Systems Llc Fuse for battery cells
JP5121865B2 (ja) * 2010-03-15 2013-01-16 株式会社東芝 エコーキャンセル回路
TWI442723B (zh) 2010-03-15 2014-06-21 Toshiba Kk Echo cancellation circuit
JP5658127B2 (ja) * 2011-11-18 2015-01-21 日本電信電話株式会社 無線通信装置、無線通信方法及び無線通信プログラム

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072830A (en) * 1976-10-04 1978-02-07 Bell Telephone Laboratories, Incorporated Variable phase shifter for adaptive echo cancellers
IT1091970B (it) * 1977-01-17 1985-07-06 Trt Telecom Radio Electr Dispositivo digitale per la cancellazione di echi,per un modulatore/demodulatore,per la trasmissione di dati mediante modulazione di una portante
NL7905577A (nl) * 1979-07-18 1981-01-20 Philips Nv Inrichting met een niet-recursieffilter.
NL8102225A (nl) * 1981-05-07 1982-12-01 Philips Nv Inrichting voor het compenseren van echosignalen.
US4464545A (en) * 1981-07-13 1984-08-07 Bell Telephone Laboratories, Incorporated Echo canceller
US4481622A (en) * 1982-04-01 1984-11-06 Anderson Jacobson, Inc. High speed dial-up telephone circuit full duplex data transmission techniques
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
JPS59126332A (ja) * 1983-01-10 1984-07-20 Nippon Telegr & Teleph Corp <Ntt> エコ−消去方式
FR2541837A1 (fr) * 1983-02-25 1984-08-31 Trt Telecom Radio Electr Procede de reduction du temps de convergence d'un annuleur d'echo et dispositif pour mettre en oeuvre ce procede
EP0175756A1 (de) * 1984-04-02 1986-04-02 AT&T Corp. Zweiadriges datenübertragungssystem mit duplexbetrieb

Also Published As

Publication number Publication date
JPS62147820A (ja) 1987-07-01
US4799214A (en) 1989-01-17
JPH0616592B2 (ja) 1994-03-02
EP0229524A1 (de) 1987-07-22
EP0229524B1 (de) 1992-03-04
ES2029797T3 (es) 1992-10-01

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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