BR9712190A - Processos para determinar quais derivações de um filtro adaptável devem ser excluídas de utilização durante uma operação de cancelamento de eco e para determinar um comprimento de percurso de eco de um sistema de comunicação, e, cancelador de eco. - Google Patents

Processos para determinar quais derivações de um filtro adaptável devem ser excluídas de utilização durante uma operação de cancelamento de eco e para determinar um comprimento de percurso de eco de um sistema de comunicação, e, cancelador de eco.

Info

Publication number
BR9712190A
BR9712190A BR9712190-8A BR9712190A BR9712190A BR 9712190 A BR9712190 A BR 9712190A BR 9712190 A BR9712190 A BR 9712190A BR 9712190 A BR9712190 A BR 9712190A
Authority
BR
Brazil
Prior art keywords
echo
derivations
excluded
processes
communication system
Prior art date
Application number
BR9712190-8A
Other languages
English (en)
Inventor
Karim El Malki
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of BR9712190A publication Critical patent/BR9712190A/pt

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
    • 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)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

"PROCESSOS PARA DETERMINAR QUAIS DERIVAçõES DE UM FILTRO ADAPTáVEL DEVEM SER EXCLUìDAS DE UTILIZAçãO DURANTE UMA OPERAçãO DE CANCELAMENTO DE ECO E PARA DETERMINAR UM COMPRIMENTO DE PERCURSO DE ECO DE UM SISTEMA DE COMUNICAçãO, E, CANCELADOR DE ECO". Um aparelho (2) para cancelamento de eco e processo envolve uma operação EPR para analisar resposta de percurso de eco e subsequentemente uma operação CR para configurar um filtro FIR adaptável (52). A configuração do filtro adaptável (52) vantasojamente resulta em somente uma gama de derivações e coeficientes de filtro entre dois pontos extremos de derivação sendo envolvidos em multiplicação, adição, e armazenamento de filtro durante a operação de cancelamento de eco.
BR9712190-8A 1996-10-01 1997-09-29 Processos para determinar quais derivações de um filtro adaptável devem ser excluídas de utilização durante uma operação de cancelamento de eco e para determinar um comprimento de percurso de eco de um sistema de comunicação, e, cancelador de eco. BR9712190A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/725,655 US5920548A (en) 1996-10-01 1996-10-01 Echo path delay estimation
PCT/SE1997/001638 WO1998015067A1 (en) 1996-10-01 1997-09-29 Echo path delay estimation

Publications (1)

Publication Number Publication Date
BR9712190A true BR9712190A (pt) 1999-08-31

Family

ID=24915458

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9712190-8A BR9712190A (pt) 1996-10-01 1997-09-29 Processos para determinar quais derivações de um filtro adaptável devem ser excluídas de utilização durante uma operação de cancelamento de eco e para determinar um comprimento de percurso de eco de um sistema de comunicação, e, cancelador de eco.

Country Status (10)

Country Link
US (1) US5920548A (pt)
EP (1) EP0929945B1 (pt)
JP (1) JP4104663B2 (pt)
KR (1) KR100338656B1 (pt)
CN (1) CN1118956C (pt)
AU (1) AU723088B2 (pt)
BR (1) BR9712190A (pt)
CA (1) CA2267410C (pt)
DE (1) DE69734932T2 (pt)
WO (1) WO1998015067A1 (pt)

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US8571244B2 (en) 2008-03-25 2013-10-29 Starkey Laboratories, Inc. Apparatus and method for dynamic detection and attenuation of periodic acoustic feedback
US8917891B2 (en) 2010-04-13 2014-12-23 Starkey Laboratories, Inc. Methods and apparatus for allocating feedback cancellation resources for hearing assistance devices
US9654885B2 (en) 2010-04-13 2017-05-16 Starkey Laboratories, Inc. Methods and apparatus for allocating feedback cancellation resources for hearing assistance devices
US8942398B2 (en) 2010-04-13 2015-01-27 Starkey Laboratories, Inc. Methods and apparatus for early audio feedback cancellation for hearing assistance devices
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Also Published As

Publication number Publication date
AU723088B2 (en) 2000-08-17
EP0929945A1 (en) 1999-07-21
AU4579097A (en) 1998-04-24
US5920548A (en) 1999-07-06
WO1998015067A1 (en) 1998-04-09
KR100338656B1 (ko) 2002-05-30
JP2001501413A (ja) 2001-01-30
EP0929945B1 (en) 2005-12-21
DE69734932D1 (de) 2006-01-26
KR20000048836A (ko) 2000-07-25
JP4104663B2 (ja) 2008-06-18
CA2267410A1 (en) 1998-04-09
CN1239609A (zh) 1999-12-22
CN1118956C (zh) 2003-08-20
DE69734932T2 (de) 2006-08-17
CA2267410C (en) 2004-02-03

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Legal Events

Date Code Title Description
B06A Patent application procedure suspended [chapter 6.1 patent gazette]
B11B Dismissal acc. art. 36, par 1 of ipl - no reply within 90 days to fullfil the necessary requirements