ES2113438T3 - Metodo para la deteccion de una señal de tono de supresion de un cancelador de eco. - Google Patents

Metodo para la deteccion de una señal de tono de supresion de un cancelador de eco.

Info

Publication number
ES2113438T3
ES2113438T3 ES92922150T ES92922150T ES2113438T3 ES 2113438 T3 ES2113438 T3 ES 2113438T3 ES 92922150 T ES92922150 T ES 92922150T ES 92922150 T ES92922150 T ES 92922150T ES 2113438 T3 ES2113438 T3 ES 2113438T3
Authority
ES
Spain
Prior art keywords
sampling
signal
frequency
phase
masked
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
ES92922150T
Other languages
English (en)
Inventor
Heimo Lahdemaki
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.)
Nokia Oyj
Original Assignee
Nokia Telecommunications Oy
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 Nokia Telecommunications Oy filed Critical Nokia Telecommunications Oy
Application granted granted Critical
Publication of ES2113438T3 publication Critical patent/ES2113438T3/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Pens And Brushes (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Burglar Alarm Systems (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

EL INVENTO DESCRIBE UN METODO PARA LA DETECCION DE SEÑALES ENMASCARADAS EN UN COMPENSADOR DE ECOS. LA SEÑAL DE TONO ENMASCARADA ESTA DENTRO DE UN PREDETERMINADO MARGEN DE TOLERANCIA DE UNA FRECUENCIA DE TRABAJO, E INCLUYE INVERSIONES DE FASE PARA INTERVALOS DE TIEMPO PREDETERMINADOS. DE ACUERDO CON EL INVENTO, EL METODO COMPRENDE LOS PASOS DE: A) SUPRESION DE LAS FRECUENCIAS DE LA SEÑAL DE ENTRADA (SIN, RIN), QUE ESTEN FUERA DE DICHO MARGEN DE TOLERANCIA, POR MEDIO DE UN FILTRO DE PASO DE BANDA (33), B) MUESTREO (34) DE LA SEÑAL FILTRADA PARA UNA FRECUENCIA DE MUESTREO, DICHA FRECUENCIA DE MUESTREO SERA APROXIMADAMENTE LA MITAD DE LA FRECUENCIA DE TRABAJO, DE FORMA QUE PUEDA SUBSTITUIR A LA FRECUENCIA DE TRABAJO EN LAS PROXIMIDADES DE FRECUENCIA CERO, C) CREACION DE UNA VERSION SUSTANCIALMENTE EN FASE PARA DICHO COMPONENTE DE LA SEÑAL DE MUESTREO, D) RETRASO DE DICHA VERSION EN FASE, APROXIMADAMENTE 2N PERIODOS DE LA SEÑAL DE MUESTREO, EN DONDE N ES UN NUMERO ENTERO POSITIVO, E) DETECCION (34) DE UNA INVERSION DE FASE EN LA SEÑAL DE TONO ENMASCARADA POR MEDIO DE UNA OPERACION XOR, LLEVADA A CABO SOBRE EL COMPONENTE DE SUBSTITUCION DE LA SEÑAL DE MUESTREO Y LA VERSION RETARDADA DE LA MISMA.
ES92922150T 1991-11-04 1992-10-28 Metodo para la deteccion de una señal de tono de supresion de un cancelador de eco. Expired - Lifetime ES2113438T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI915199A FI89659C (fi) 1991-11-04 1991-11-04 Foerfarande foer identifiering av en spaerrsignal hos en ekoslaeckare

Publications (1)

Publication Number Publication Date
ES2113438T3 true ES2113438T3 (es) 1998-05-01

Family

ID=8533425

Family Applications (1)

Application Number Title Priority Date Filing Date
ES92922150T Expired - Lifetime ES2113438T3 (es) 1991-11-04 1992-10-28 Metodo para la deteccion de una señal de tono de supresion de un cancelador de eco.

Country Status (11)

Country Link
US (1) US5420921A (es)
EP (1) EP0565672B1 (es)
JP (1) JP3408253B2 (es)
AT (1) ATE163820T1 (es)
AU (1) AU654059B2 (es)
DE (1) DE69224625T2 (es)
DK (1) DK0565672T3 (es)
ES (1) ES2113438T3 (es)
FI (1) FI89659C (es)
NO (1) NO304863B1 (es)
WO (1) WO1993009607A1 (es)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2959353B2 (ja) * 1993-09-07 1999-10-06 三菱電機株式会社 エコーキャンセラ装置
FR2720577B1 (fr) * 1994-05-27 1996-08-14 Sgs Thomson Microelectronics Circuit de détection de tonalité téléphonique.
US5631958A (en) 1994-10-04 1997-05-20 Coherent Communications Systems Corp. Automatic echo cancellation for an integrated services digital network interface
US5565737A (en) * 1995-06-07 1996-10-15 Eni - A Division Of Astec America, Inc. Aliasing sampler for plasma probe detection
US5689556A (en) * 1995-09-15 1997-11-18 Hughes Electronics Method of detecting narrow-band signals in an echo canceller
US5815568A (en) * 1996-01-31 1998-09-29 Telefoanktiebolaget Lm Ericsson Disabling tone detector for network echo canceller
FR2756443B1 (fr) * 1996-11-28 1998-12-24 Nortel Matra Cellular Dispositif de transcodage pourvu d'une derivation
US5848136A (en) * 1996-12-20 1998-12-08 Ncr Corporation State machine and method for monitoring and controlling operating modes in a computer-controlled telephony instrument
US5943407A (en) * 1997-12-16 1999-08-24 Lucent Techologies Inc. Performance enhancement of tone detection and FSK detection using hybrid echo cancellation
US6055310A (en) * 1997-12-17 2000-04-25 Nortel Networks Corporation Phase reversal tone detector using DSP
KR100477638B1 (ko) * 2001-09-11 2005-03-23 삼성전자주식회사 ２ｄ／３ｄ 겸용 디스플레이
US7242762B2 (en) * 2002-06-24 2007-07-10 Freescale Semiconductor, Inc. Monitoring and control of an adaptive filter in a communication system
US6961423B2 (en) 2002-06-24 2005-11-01 Freescale Semiconductor, Inc. Method and apparatus for performing adaptive filtering
US7388954B2 (en) * 2002-06-24 2008-06-17 Freescale Semiconductor, Inc. Method and apparatus for tone indication
US7215765B2 (en) * 2002-06-24 2007-05-08 Freescale Semiconductor, Inc. Method and apparatus for pure delay estimation in a communication system
DE60217859T2 (de) 2002-08-28 2007-07-05 Freescale Semiconductor, Inc., Austin Verfahren und Vorrichtung zur Detektierung von Tonsignalen
US7609646B1 (en) 2004-04-14 2009-10-27 Cisco Technology, Inc. Method and apparatus for eliminating false voice detection in voice band data service
US7583621B2 (en) * 2004-10-05 2009-09-01 Cisco Technology, Inc. Method and apparatus for suppressing echo cancelling in a packet switched network
US7646763B2 (en) * 2004-10-08 2010-01-12 Cisco Technology, Inc. Method and apparatus for improving voice band data (VBD) connectivity in a communications network
JP2007104721A (ja) * 2006-12-18 2007-04-19 Oki Electric Ind Co Ltd 位相反転検出装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5797746A (en) * 1980-12-10 1982-06-17 Fujitsu Ltd Detecting circuit for pilot signal and noise
JPS60121856A (ja) * 1983-12-06 1985-06-29 Nec Corp 単一周波数信号検出回路
FR2597690B1 (fr) * 1986-04-22 1988-06-10 Trt Telecom Radio Electr Appareil de detection et de discrimination de sauts de phase dans un signal periodique et application a un signal telephonique de tonalite avec inversions de phase.
US5014307A (en) * 1989-06-29 1991-05-07 Integrated Network Corporation Method and apparatus for echo canceler disablement
US5029204A (en) * 1989-10-26 1991-07-02 Dsc Communications Corporation Operational status controller for echo canceling
US5123009A (en) * 1990-10-26 1992-06-16 Racal Data Communications Inc. Method and apparatus for disabling an echo canceller

Also Published As

Publication number Publication date
FI915199A7 (fi) 1993-05-05
EP0565672B1 (en) 1998-03-04
ATE163820T1 (de) 1998-03-15
JPH06503698A (ja) 1994-04-21
AU654059B2 (en) 1994-10-20
FI915199A0 (fi) 1991-11-04
DK0565672T3 (da) 1998-05-25
EP0565672A1 (en) 1993-10-20
FI89659C (fi) 1993-10-25
DE69224625T2 (de) 1998-07-16
DE69224625D1 (de) 1998-04-09
HK1009362A1 (en) 1999-05-28
NO932189D0 (no) 1993-06-14
AU2882292A (en) 1993-06-07
NO932189L (no) 1993-09-01
WO1993009607A1 (en) 1993-05-13
JP3408253B2 (ja) 2003-05-19
US5420921A (en) 1995-05-30
NO304863B1 (no) 1999-02-22
FI89659B (fi) 1993-07-15

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