ES2101147T3 - Proceso y dispositivo para cancelacion digital adaptable del eco generado en conexiones telefonicas no-estacionarias. - Google Patents

Proceso y dispositivo para cancelacion digital adaptable del eco generado en conexiones telefonicas no-estacionarias.

Info

Publication number
ES2101147T3
ES2101147T3 ES93102255T ES93102255T ES2101147T3 ES 2101147 T3 ES2101147 T3 ES 2101147T3 ES 93102255 T ES93102255 T ES 93102255T ES 93102255 T ES93102255 T ES 93102255T ES 2101147 T3 ES2101147 T3 ES 2101147T3
Authority
ES
Spain
Prior art keywords
eco
telephone connections
canceler
estimation
generated
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 - Lifetime
Application number
ES93102255T
Other languages
English (en)
Inventor
Giacomo Cannalire
Luigi Morini
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.)
Italtel SpA
Original Assignee
Italtel SpA
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 Italtel SpA filed Critical Italtel SpA
Application granted granted Critical
Publication of ES2101147T3 publication Critical patent/ES2101147T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

SE DESCRIBE UN DISPOSITIVO DE CANCELACION DE ECO UTIL EN CONEXIONES TELEFONICAS AFECTADAS POR MOVIMIENTO VERTICAL DE FASE. EL CANCELADOR CALCULA EL RETRASO DE LA PROPAGACION DE LA LINEA DE ECO Y PRODUCE UNA ESTIMACION DE LA SEÑAL DE ECO MEDIANTE EL FILTRADO DIGITAL DE LA SEÑAL ORIENTADA POR EL INTERLOCUTOR LEJANO. LA ESTIMACION DE ECO SE SUBSTRAE ENTONCES DEL ECO ACTUAL PARA ELIMINAR LA ESCUCHA DE LAS PERTURBACIONES DEBIDAS AL MISMO. EL FILTRO USADO ES DE TIPO FIR CON COEFICIENTES ADAPTATIVOS ACTUALIZADOS INTERACTIVAMENTE MEDIANTE LA ADICION ALGEBRAICA A LOS VALORES EXISTENTES EN LA INTERACCION PRECEDENTE, UN TERMINO DE CORRECCION PROPORCIONAL AL ERROR ESTIMADO. LA FRECUENCIA DE LAS ITERACIONES ACTUALIZADORES DEL COEFICIENTE ES UN MULTIPLO DE LA VELOCIDAD FC DE ADQUISICION DE LAS MUESTRAS DE VOZ Y DEL ECO POR PARTE DEL CANCELADOR.
ES93102255T 1992-02-24 1993-02-12 Proceso y dispositivo para cancelacion digital adaptable del eco generado en conexiones telefonicas no-estacionarias. Expired - Lifetime ES2101147T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI920398A IT1254819B (it) 1992-02-24 1992-02-24 Procedimento e dispositivo per la cancellazione numerica adattativa dell'eco generato in collegamenti telefonici non stazionari

Publications (1)

Publication Number Publication Date
ES2101147T3 true ES2101147T3 (es) 1997-07-01

Family

ID=11362103

Family Applications (1)

Application Number Title Priority Date Filing Date
ES93102255T Expired - Lifetime ES2101147T3 (es) 1992-02-24 1993-02-12 Proceso y dispositivo para cancelacion digital adaptable del eco generado en conexiones telefonicas no-estacionarias.

Country Status (7)

Country Link
US (1) US5414766A (es)
EP (1) EP0557829B1 (es)
AT (1) ATE152557T1 (es)
DE (1) DE69310240T2 (es)
ES (1) ES2101147T3 (es)
GR (1) GR3024103T3 (es)
IT (1) IT1254819B (es)

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JP2576767B2 (ja) * 1993-09-10 1997-01-29 日本電気株式会社 エコー消去方法およびエコーキャンセラ
US5457684A (en) * 1993-12-21 1995-10-10 At&T Ipm Corp. Delay-less signal processing arrangement for use in an ATM network
FI935834A (fi) * 1993-12-23 1995-06-24 Nokia Telecommunications Oy Menetelmä kaikukohtaan sovittautumiseksi kaiunpoistajassa
US5535194A (en) * 1994-07-14 1996-07-09 Motorola, Inc. Method and apparatus for echo canceling with double-talk immunity
DE4426226A1 (de) * 1994-07-23 1996-01-25 Philips Patentverwaltung Schaltungsanordnung zum Übertragen von codierten Sprachsignalen
US5600718A (en) * 1995-02-24 1997-02-04 Ericsson Inc. Apparatus and method for adaptively precompensating for loudspeaker distortions
US5680450A (en) * 1995-02-24 1997-10-21 Ericsson Inc. Apparatus and method for canceling acoustic echoes including non-linear distortions in loudspeaker telephones
US5587998A (en) * 1995-03-03 1996-12-24 At&T Method and apparatus for reducing residual far-end echo in voice communication networks
JPH08251082A (ja) * 1995-03-13 1996-09-27 Sony Corp エコー除去装置
US5577027A (en) * 1995-04-18 1996-11-19 Intel Corporation Apparatus and method for effectively eliminating the echo signal of transmitting signal in a modem
US5636272A (en) * 1995-05-30 1997-06-03 Ericsson Inc. Apparatus amd method for increasing the intelligibility of a loudspeaker output and for echo cancellation in telephones
US5664011A (en) * 1995-08-25 1997-09-02 Lucent Technologies Inc. Echo canceller with adaptive and non-adaptive filters
US5675644A (en) * 1995-09-26 1997-10-07 Qualcomm Incorporated Method and apparatus for canceling echo accounting for delay variations
US5805480A (en) * 1997-07-03 1998-09-08 National Semiconductor Corporation Rotationally predictive adaptive filter
US6031908A (en) * 1997-11-14 2000-02-29 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having variable adaptive gain settings
US6181791B1 (en) * 1998-01-06 2001-01-30 Stmicroelectronics, Inc. Apparatus and method for reducing local interference in subscriber loop communication system
AU4492100A (en) * 1999-04-22 2000-11-10 Broadcom Corporation Gigabit ethernet with timing offsets between the twisted pairs
SE516143C2 (sv) * 1999-05-10 2001-11-26 Ericsson Telefon Ab L M Skattning av ren fördröjning
EP1117191A1 (en) * 2000-01-13 2001-07-18 Telefonaktiebolaget Lm Ericsson Echo cancelling method
AU783527B2 (en) 2000-01-25 2005-11-03 Tq Delta, Llc System and method for the application of an LMS method to updating an echo canceller in an ADSL modem
DE10055375A1 (de) * 2000-11-08 2002-05-23 Infineon Technologies Ag Auswerteschaltung für Wechselspannungsimpulse
US6963643B1 (en) * 2002-06-14 2005-11-08 Xilinx, Inc. Method and apparatus for canceling echo in a telephone communication system
EP1518393A1 (en) * 2002-06-19 2005-03-30 Koninklijke Philips Electronics N.V. Non stationary echo canceller
BR0313259A (pt) * 2002-08-06 2005-06-14 Siemens Ag Processamento de erros de informações úteis recebidas através de uma rede de comunicação
US7043208B2 (en) * 2002-10-15 2006-05-09 Motorola, Inc. Method and apparatus to reduce interference in a communication device
US8077782B2 (en) * 2005-01-11 2011-12-13 Sharp Kabushiki Kaisha Adaptive modulation control apparatus and wireless communication apparatus
CN101026659B (zh) * 2006-02-23 2010-04-07 中兴通讯股份有限公司 一种回声延时定位的实现方法
KR100758206B1 (ko) * 2006-09-14 2007-09-12 주식회사 쏠리테크 반향성분 제거 시스템 및 반향성분 제거방법
US8369511B2 (en) * 2006-12-26 2013-02-05 Huawei Technologies Co., Ltd. Robust method of echo suppressor
US7928392B1 (en) * 2009-10-07 2011-04-19 T-Ray Science Inc. Systems and methods for blind echo cancellation

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8102225A (nl) * 1981-05-07 1982-12-01 Philips Nv Inrichting voor het compenseren van echosignalen.
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
EP0287743B1 (en) * 1987-04-22 1993-03-03 International Business Machines Corporation Echo cancelling device with phase-roll correction
US4813073A (en) * 1987-07-02 1989-03-14 Codex Corporation Echo cancellation
FR2629293A1 (fr) * 1988-03-25 1989-09-29 Trt Telecom Radio Electr Annuleur d'echo pour signal d'echo a phase variable
IT1228106B (it) * 1988-12-21 1991-05-28 Sits Soc It Telecom Siemens Procedimento e dispositivo per la cancellazione numerica adattativa dell'eco generato in collegamenti telefonici con caratteristiche varianti nel tempo
EP0403716B1 (en) * 1989-06-22 1995-09-13 International Business Machines Corporation Echo cancelling device providing adjustment of the echo canceller coefficients during full-duplex transmission

Also Published As

Publication number Publication date
DE69310240T2 (de) 1997-10-09
EP0557829B1 (en) 1997-05-02
ITMI920398A1 (it) 1993-08-24
DE69310240D1 (de) 1997-06-05
ATE152557T1 (de) 1997-05-15
EP0557829A2 (en) 1993-09-01
GR3024103T3 (es) 1997-10-31
IT1254819B (it) 1995-10-11
EP0557829A3 (en) 1995-08-02
ITMI920398A0 (it) 1992-02-24
US5414766A (en) 1995-05-09

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