BR9813788A - Dispositivos para processar sinal e para supressão de eco - Google Patents

Dispositivos para processar sinal e para supressão de eco

Info

Publication number
BR9813788A
BR9813788A BR9813788-3A BR9813788A BR9813788A BR 9813788 A BR9813788 A BR 9813788A BR 9813788 A BR9813788 A BR 9813788A BR 9813788 A BR9813788 A BR 9813788A
Authority
BR
Brazil
Prior art keywords
echo
signal
attenuation
attenuator
central
Prior art date
Application number
BR9813788-3A
Other languages
English (en)
Inventor
Eric Douglas Romesburg
Jim Agne Jerker Rasmusson
Original Assignee
Ericsson Inc
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 Inc filed Critical Ericsson Inc
Publication of BR9813788A publication Critical patent/BR9813788A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Telephone Function (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

"DISPOSITIVOS PARA PROCESSAR SINAL E PARA SUPRESSãO DE ECO" Processos e aparelhos para realizar a supressão de eco em sistemas de comunicações que incluem um supressor de eco, aqui designado de um atenuador central de CA, que atenua o componente de eco de um sinal de comunicações multiplicando uma parte do sinal de comunicações por um fator de escala apropriado. Especificamente, o atenuador central de CA escalona aquela parte do sinal de comunicações situada dentro de uma janela de atenuação deslizante. A janela de atenuação rastreia o sinal de comunicações de forma que o atenuador central de CA suprime o componente de eco enquanto passando outros componentes de sinal de interesse (p.ex., voz e ruído da extremidade proximal). O fator de escala dentro da janela de atenuação e a dimensão da janela de atenuação propriamente dita, são dinamicamente ajustados de modo que o atenuador central de CA introduz distorção de sinal mínima e poucos artefatos audíveis. O ajuste dinâmico é realizado para proporcionar um ganho de eco de ida e volta desejado em um sistema no qual o atenuador central de CA é implementado. Para aquela finalidade, uma medição da atenuação de eco alcançada por um supressor de eco (p.ex., um cancelador de eco adaptativo) é obtida computando uma relação de primeiro e segundo valores, na qual os primeiro e segundo valores indicam níveis de energia nos sinais de saída e de entrada do supressor de eco, respectivamente. Alternativamente, a atenuação de eco realizada por um cancelador de eco de atualização em blocos é obtida computando uma relação de primeiro e segundo valores, na qual o primeiro valor indica um nível de energia em um conjunto de coeficientes de atualização do cancelador de eco e o segundo valor indica um nível de energia no sinal de entrada do cancelador de eco. Em cada caso, a relação computada pode ser usada para ajustar o nível de atenuação proporcionado por um supressor de eco residual.
BR9813788-3A 1998-01-09 1998-12-30 Dispositivos para processar sinal e para supressão de eco BR9813788A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/005,149 US6160886A (en) 1996-12-31 1998-01-09 Methods and apparatus for improved echo suppression in communications systems
PCT/US1998/027533 WO1999035814A2 (en) 1998-01-09 1998-12-30 Methods and apparatus for improved echo suppression in communications systems

Publications (1)

Publication Number Publication Date
BR9813788A true BR9813788A (pt) 2000-10-03

Family

ID=21714436

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9813788-3A BR9813788A (pt) 1998-01-09 1998-12-30 Dispositivos para processar sinal e para supressão de eco

Country Status (10)

Country Link
US (1) US6160886A (pt)
EP (1) EP1046272B1 (pt)
JP (1) JP4463981B2 (pt)
KR (1) KR100519002B1 (pt)
CN (1) CN1286863A (pt)
AU (1) AU754246B2 (pt)
BR (1) BR9813788A (pt)
EE (1) EE200000397A (pt)
MY (1) MY133057A (pt)
WO (1) WO1999035814A2 (pt)

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AU2005242180B2 (en) * 2000-01-27 2007-08-09 Qualcomm Incorporated Improved system and method for implementation of an echo canceller
US6606382B2 (en) * 2000-01-27 2003-08-12 Qualcomm Incorporated System and method for implementation of an echo canceller
US6760435B1 (en) * 2000-02-08 2004-07-06 Lucent Technologies Inc. Method and apparatus for network speech enhancement
US7050575B1 (en) 2000-06-16 2006-05-23 Ericsson Inc. Echo canceler coefficient update apparatus and method
US6622030B1 (en) * 2000-06-29 2003-09-16 Ericsson Inc. Echo suppression using adaptive gain based on residual echo energy
US6650912B2 (en) * 2000-09-18 2003-11-18 Qualcomm, Incorporated Selecting paging channel mode
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KR20020058116A (ko) * 2000-12-29 2002-07-12 조미화 음성 제어 텔레비젼 수상기 및 음성 제어 방법
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US7027591B2 (en) * 2002-10-16 2006-04-11 Ericsson Inc. Integrated noise cancellation and residual echo suppression
US7003099B1 (en) * 2002-11-15 2006-02-21 Fortmedia, Inc. Small array microphone for acoustic echo cancellation and noise suppression
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US7065207B2 (en) * 2003-09-11 2006-06-20 Freescale Semiconductor, Inc. Controlling attenuation during echo suppression
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US8949120B1 (en) * 2006-05-25 2015-02-03 Audience, Inc. Adaptive noise cancelation
JP4727542B2 (ja) * 2006-09-26 2011-07-20 富士通株式会社 電子機器、そのエコーキャンセル方法、そのエコーキャンセルプログラム、記録媒体及び回路基板
US8335685B2 (en) 2006-12-22 2012-12-18 Qnx Software Systems Limited Ambient noise compensation system robust to high excitation noise
CN101286763B (zh) * 2006-12-26 2012-12-12 高扬 一种有效的回波抑制器
US7809129B2 (en) * 2007-08-31 2010-10-05 Motorola, Inc. Acoustic echo cancellation based on noise environment
US8199927B1 (en) 2007-10-31 2012-06-12 ClearOnce Communications, Inc. Conferencing system implementing echo cancellation and push-to-talk microphone detection using two-stage frequency filter
US8050398B1 (en) 2007-10-31 2011-11-01 Clearone Communications, Inc. Adaptive conferencing pod sidetone compensator connecting to a telephonic device having intermittent sidetone
US9225842B2 (en) 2008-12-22 2015-12-29 Koninklijke Philips N.V. Determining an acoustic coupling between a far-end talker signal and a combined signal
JP5923705B2 (ja) * 2012-03-09 2016-05-25 パナソニックＩｐマネジメント株式会社 通話信号処理装置
US9203527B2 (en) * 2013-03-15 2015-12-01 2236008 Ontario Inc. Sharing a designated audio signal
JP6295722B2 (ja) * 2014-02-28 2018-03-20 沖電気工業株式会社 エコー抑圧装置、プログラム及び方法
GB2547063B (en) 2014-10-30 2018-01-31 Imagination Tech Ltd Noise estimator
GB2532041B (en) 2014-11-06 2019-05-29 Imagination Tech Ltd Comfort noise generation
US9672821B2 (en) * 2015-06-05 2017-06-06 Apple Inc. Robust speech recognition in the presence of echo and noise using multiple signals for discrimination
US11303758B2 (en) * 2019-05-29 2022-04-12 Knowles Electronics, Llc System and method for generating an improved reference signal for acoustic echo cancellation
JP7183119B2 (ja) * 2019-06-13 2022-12-05 株式会社デンソーテン 音声信号処理装置
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Also Published As

Publication number Publication date
KR100519002B1 (ko) 2005-10-06
CN1286863A (zh) 2001-03-07
WO1999035814A3 (en) 1999-09-10
JP4463981B2 (ja) 2010-05-19
MY133057A (en) 2007-10-31
AU1946899A (en) 1999-07-26
KR20010033993A (ko) 2001-04-25
EP1046272B1 (en) 2003-10-08
WO1999035814A2 (en) 1999-07-15
EP1046272A2 (en) 2000-10-25
JP2002501338A (ja) 2002-01-15
EE200000397A (et) 2002-02-15
AU754246B2 (en) 2002-11-07
US6160886A (en) 2000-12-12

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