ES2056986T3 - Anulador de eco. - Google Patents

Anulador de eco.

Info

Publication number
ES2056986T3
ES2056986T3 ES89104848T ES89104848T ES2056986T3 ES 2056986 T3 ES2056986 T3 ES 2056986T3 ES 89104848 T ES89104848 T ES 89104848T ES 89104848 T ES89104848 T ES 89104848T ES 2056986 T3 ES2056986 T3 ES 2056986T3
Authority
ES
Spain
Prior art keywords
echo
offset correction
frequency offset
expected
phase error
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
ES89104848T
Other languages
English (en)
Inventor
Yoshinori Tanaka
Shigeyuki Unagami
Masayoshi Inoue
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
Priority claimed from JP6426988A external-priority patent/JPH01236830A/ja
Priority claimed from JP10573188A external-priority patent/JPH01276932A/ja
Priority claimed from JP18977388A external-priority patent/JPH0239730A/ja
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Application granted granted Critical
Publication of ES2056986T3 publication Critical patent/ES2056986T3/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
    • 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)
  • Networks Using Active Elements (AREA)
  • Primary Cells (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

SE PROPORCIONA UN CANCELADOR DE ECO CON UNA UNIDAD GENERADORA DE ECO ESPERADO (101) QUE GENERA UN ECO ESPERADO DE UNA SEÑAL DE TRANSMISION, Y UNA UNIDAD DE CORRECCION DEL DESPLAZAMIENTO DE FRECUENCIA (75) QUE DETECTA UN ERROR DE FASE ENTRE UN ECO EN UNA SEÑAL RECIBIDA Y UN ECO ESPERADO PROCEDENTE DE LA UNIDAD GENERADORA DE ECO ESPERADO (101) Y CORRIGE EL DESPLAZAMIENTO DE FRECUENCIA DEL ECO ESPERADO MEDIANTE UNA ESTIMACION DE DESPLAZAMIENTO DE FRECUENCIA BASADA EN EL ERROR DE FASE, UTILIZANDOSE EL ECO ESPERADO TRAS LA CORRECCION DE DESPLAZAMIENTO MEDIANTE LA UNIDAD DE CORRECCION DE DESPLAZAMIENTO DE FRECUENCIA (75) PARA SUPRIMIR EL ECO EN LA SEÑAL RECIBIDA, UTILIZANDO LA UNIDAD DE CORRECCION DE DESPLAZAMIENTO DE FRECUENCIA (75) EL ERROR DE FASE OBTENIDO TRAS LA NORMALIZACION DEL ERROR DE FASE POR LA MAGNITUD DEL ECO EN LA SEÑAL RECIBIDA. POR TODO ELLO, ES POSIBLE EFECTUAR UNA CORRECCION DE DESPLAZAMIENTO DE ECO QUE SE ADAPTE A LAS CARACTERISTICAS DE ECO REMOTO. ADEMAS, ES DESEABLE EFECTUAR LA CORRECCION DE DESPLAZAMIENTO DE ECO TRAS CONFIRMARSE QUE LA FRECUENCIA DE CAMBIO DE LA SALIDA DE UN SUBSTRACTOR PARA CANCELAR EL ECO PROXIMO ES PRACTICAMENTE CERO.
ES89104848T 1988-03-17 1989-03-17 Anulador de eco. Expired - Lifetime ES2056986T3 (es)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP6426988A JPH01236830A (ja) 1988-03-17 1988-03-17 エコーキャンセラのトレーニング起動装置
JP10573188A JPH01276932A (ja) 1988-04-28 1988-04-28 エコーキャンセラ
JP18977388A JPH0239730A (ja) 1988-07-29 1988-07-29 エコーキヤンセラ

Publications (1)

Publication Number Publication Date
ES2056986T3 true ES2056986T3 (es) 1994-10-16

Family

ID=27298429

Family Applications (1)

Application Number Title Priority Date Filing Date
ES89104848T Expired - Lifetime ES2056986T3 (es) 1988-03-17 1989-03-17 Anulador de eco.

Country Status (7)

Country Link
US (1) US5528687A (es)
EP (1) EP0333227B1 (es)
AT (1) ATE107444T1 (es)
AU (1) AU601104B2 (es)
CA (1) CA1338218C (es)
DE (1) DE68916073T2 (es)
ES (1) ES2056986T3 (es)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2947093B2 (ja) * 1994-11-02 1999-09-13 日本電気株式会社 適応フィルタによるシステム同定の方法および装置
US5625646A (en) * 1995-06-26 1997-04-29 Motorola, Inc. Method, device, DSP and modem for efficient echo canceler phase roll tracking
FR2739736B1 (fr) * 1995-10-05 1997-12-05 Jean Laroche Procede de reduction des pre-echos ou post-echos affectant des enregistrements audio
US5682378A (en) * 1995-11-14 1997-10-28 Paradyne Corporation Echo cancellation for modems
US5668865A (en) * 1996-02-26 1997-09-16 Lucent Technologies Inc. Echo canceler E-side speech detector
US6011783A (en) * 1997-06-11 2000-01-04 Nortel Networks Corporation Method and apparatus for monitoring echo cancellation performance within a telephone communications network
US6295289B1 (en) * 1998-11-30 2001-09-25 Nokia Mobile Phones, Ltd. Power control in a transmitter
US6760435B1 (en) * 2000-02-08 2004-07-06 Lucent Technologies Inc. Method and apparatus for network speech enhancement
KR100385611B1 (ko) * 2001-06-01 2003-05-27 이노에이스(주) 이동통신시스템의 무선 중계장치
US7702004B2 (en) * 2002-12-09 2010-04-20 Alexander Roger Deas Simultaneous bidirectional differential signalling interface
US7554933B2 (en) * 2004-01-09 2009-06-30 Realtek Semiconductor Corp. Echo cancellation device for full duplex communication systems
US7738408B2 (en) * 2004-01-09 2010-06-15 Realtek Semiconductor Corp. Transceiver for full duplex communication systems
US7436787B2 (en) * 2004-02-10 2008-10-14 Realtek Semiconductor Corp. Transceiver for full duplex communication systems
US7565289B2 (en) * 2005-09-30 2009-07-21 Apple Inc. Echo avoidance in audio time stretching
DE102005057053A1 (de) * 2005-11-30 2007-05-31 Vega Grieshaber Kg Referenzpulserzeugung
MX2022006211A (es) * 2019-11-26 2022-08-22 Arris Entpr Llc Entrenamiento de cancelador de eco en redes duplex completas.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2479617A1 (fr) * 1980-03-26 1981-10-02 Trt Telecom Radio Electr Annuleur d'echo pour signal d'echo a phase variable
DE3212056A1 (de) * 1982-04-01 1984-02-09 ANT Nachrichtentechnik GmbH, 7150 Backnang Verfahren und schaltungsanordnung zur durchfuehrung des verfahrens zur adaptiven echoloeschung in endgeraeten fuer duplex-datenuebertragung ueber zweidrahtleitungen
FR2528643A1 (fr) * 1982-06-14 1983-12-16 Trt Telecom Radio Electr Procede destine a reduire le temps de convergence d'un annuleur d'echo et dispositif utilise pour mettre en oeuvre 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
US4574166A (en) * 1983-02-04 1986-03-04 At&T Bell Laboratories Tandem adaptive filter arrangement
US4742510A (en) * 1986-04-04 1988-05-03 Massachusetts Institute Of Technology Near and far echo canceller for data communications
WO1988007792A1 (en) * 1987-03-27 1988-10-06 Universal Data Systems, Inc. Modem with improved remote echo location and cancellation
US4813073A (en) * 1987-07-02 1989-03-14 Codex Corporation Echo cancellation

Also Published As

Publication number Publication date
AU3135489A (en) 1989-09-28
EP0333227B1 (en) 1994-06-15
ATE107444T1 (de) 1994-07-15
DE68916073T2 (de) 1994-11-24
US5528687A (en) 1996-06-18
AU601104B2 (en) 1990-08-30
CA1338218C (en) 1996-04-02
EP0333227A2 (en) 1989-09-20
EP0333227A3 (en) 1990-01-03
DE68916073D1 (de) 1994-07-21

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