WO1998030009A3 - An ac-center clipper for noise and echo suppression in a communications system - Google Patents

An ac-center clipper for noise and echo suppression in a communications system Download PDF

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Publication number
WO1998030009A3
WO1998030009A3 PCT/US1997/022055 US9722055W WO9830009A3 WO 1998030009 A3 WO1998030009 A3 WO 1998030009A3 US 9722055 W US9722055 W US 9722055W WO 9830009 A3 WO9830009 A3 WO 9830009A3
Authority
WO
WIPO (PCT)
Prior art keywords
mobile station
center
clipping
echo
echo suppression
Prior art date
Application number
PCT/US1997/022055
Other languages
French (fr)
Other versions
WO1998030009A2 (en
Inventor
Eric Douglas Romesburg
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
Priority to BR9713809-6A priority Critical patent/BR9713809A/en
Priority to EEP199900267A priority patent/EE9900267A/en
Priority to AU78937/98A priority patent/AU7893798A/en
Priority to EP97949720A priority patent/EP0950309A2/en
Publication of WO1998030009A2 publication Critical patent/WO1998030009A2/en
Publication of WO1998030009A3 publication Critical patent/WO1998030009A3/en

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
    • 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
    • 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

Abstract

An echo and noise suppression device for processing an information signal to suppress unwanted signal components. In an exemplary embodiment, the echo suppression device includes an AC-center clipper having a clipping window with an adjustable window center. A clipping threshold of the AC-center clipper is set to attenuate the unwanted signal components, and the center of the clipping window is varied in accordance with the value of the information signal so that the unwanted components are suppressed even when the information signal contains a significant noise component. In another exemplary embodiment, a mobile radio station is provided including a microphone for receiving a near-end audio input and for producing a near-end audio output which is to be transmitted to a far-end user. The exemplary mobile station also includes a loudspeaker for broadcasting, to a near-end user of the mobile station, a far-end audio signal which is generated by the far-end user and then received at the mobile station. An echo suppression circuit within the mobile station is used to attenuate an echo component of the near-end audio signal which results from the mobile station microphone receiving output from the mobile station loudspeaker. The echo suppression circuit includes an AC-center clipper having a clipping window with an adjustable clipping center.
PCT/US1997/022055 1996-12-31 1997-12-10 An ac-center clipper for noise and echo suppression in a communications system WO1998030009A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BR9713809-6A BR9713809A (en) 1996-12-31 1997-12-10 Signal processing device, processes for processing an information signal, and an input signal to produce an output signal, mobile station, and echo and noise suppression device for processing an input signal.
EEP199900267A EE9900267A (en) 1996-12-31 1997-12-10 The center of the AC signal to suppress noise and echo in the communication system
AU78937/98A AU7893798A (en) 1996-12-31 1997-12-10 An AC-center clipper for noise and echo suppression in a communications syst em
EP97949720A EP0950309A2 (en) 1996-12-31 1997-12-10 An ac-center clipper for noise and echo suppression in a communications system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/775,797 1996-12-31
US08/775,797 US6301357B1 (en) 1996-12-31 1996-12-31 AC-center clipper for noise and echo suppression in a communications system

Publications (2)

Publication Number Publication Date
WO1998030009A2 WO1998030009A2 (en) 1998-07-09
WO1998030009A3 true WO1998030009A3 (en) 1998-09-11

Family

ID=25105535

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/022055 WO1998030009A2 (en) 1996-12-31 1997-12-10 An ac-center clipper for noise and echo suppression in a communications system

Country Status (10)

Country Link
US (1) US6301357B1 (en)
EP (1) EP0950309A2 (en)
CN (1) CN1127840C (en)
AR (1) AR011344A1 (en)
AU (1) AU7893798A (en)
BR (1) BR9713809A (en)
CO (1) CO4810277A1 (en)
EE (1) EE9900267A (en)
MY (1) MY118791A (en)
WO (1) WO1998030009A2 (en)

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US7050575B1 (en) 2000-06-16 2006-05-23 Ericsson Inc. Echo canceler coefficient update apparatus and method
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US7027591B2 (en) * 2002-10-16 2006-04-11 Ericsson Inc. Integrated noise cancellation and residual echo suppression
US7359504B1 (en) 2002-12-03 2008-04-15 Plantronics, Inc. Method and apparatus for reducing echo and noise
WO2006040734A1 (en) 2004-10-13 2006-04-20 Koninklijke Philips Electronics N.V. Echo cancellation
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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
US8554551B2 (en) 2008-01-28 2013-10-08 Qualcomm Incorporated Systems, methods, and apparatus for context replacement by audio level
JP5136396B2 (en) * 2008-12-25 2013-02-06 ヤマハ株式会社 Howling suppression device
WO2010106820A1 (en) * 2009-03-19 2010-09-23 有限会社ケプストラム Howling canceller
US8634569B2 (en) * 2010-01-08 2014-01-21 Conexant Systems, Inc. Systems and methods for echo cancellation and echo suppression
CN103166678B (en) * 2013-02-27 2015-04-22 黎辉 Alternating current clipping pulse coding control technology
DK2822263T3 (en) * 2013-07-05 2019-06-17 Sennheiser Communications As Communication device with echo cancellation
GB2525947B (en) * 2014-10-31 2016-06-22 Imagination Tech Ltd Automatic tuning of a gain controller
CN104618933A (en) * 2015-01-08 2015-05-13 华为技术有限公司 Method for determining clipping threshold and communication device thereof
US9554207B2 (en) 2015-04-30 2017-01-24 Shure Acquisition Holdings, Inc. Offset cartridge microphones
US9565493B2 (en) 2015-04-30 2017-02-07 Shure Acquisition Holdings, Inc. Array microphone system and method of assembling the same
JP6729187B2 (en) * 2016-08-30 2020-07-22 富士通株式会社 Audio processing program, audio processing method, and audio processing apparatus
CN106303761B (en) * 2016-08-31 2019-06-11 长沙世邦通信技术有限公司 A kind of window talkback system and intercommunication method
US10367948B2 (en) 2017-01-13 2019-07-30 Shure Acquisition Holdings, Inc. Post-mixing acoustic echo cancellation systems and methods
CN108055417B (en) * 2017-12-26 2020-09-29 杭州叙简科技股份有限公司 Audio processing system and method for inhibiting switching based on voice detection echo
EP3804356A1 (en) 2018-06-01 2021-04-14 Shure Acquisition Holdings, Inc. Pattern-forming microphone array
US11297423B2 (en) 2018-06-15 2022-04-05 Shure Acquisition Holdings, Inc. Endfire linear array microphone
CN112889296A (en) 2018-09-20 2021-06-01 舒尔获得控股公司 Adjustable lobe shape for array microphone
CN109616132A (en) * 2018-12-19 2019-04-12 深圳市潮流网络技术有限公司 A kind of conference system microphone slicing self checking method
US11558693B2 (en) 2019-03-21 2023-01-17 Shure Acquisition Holdings, Inc. Auto focus, auto focus within regions, and auto placement of beamformed microphone lobes with inhibition and voice activity detection functionality
WO2020191354A1 (en) 2019-03-21 2020-09-24 Shure Acquisition Holdings, Inc. Housings and associated design features for ceiling array microphones
CN113841421A (en) 2019-03-21 2021-12-24 舒尔获得控股公司 Auto-focus, in-region auto-focus, and auto-configuration of beamforming microphone lobes with suppression
US11445294B2 (en) 2019-05-23 2022-09-13 Shure Acquisition Holdings, Inc. Steerable speaker array, system, and method for the same
US11302347B2 (en) 2019-05-31 2022-04-12 Shure Acquisition Holdings, Inc. Low latency automixer integrated with voice and noise activity detection
JP2022545113A (en) 2019-08-23 2022-10-25 シュアー アクイジッション ホールディングス インコーポレイテッド One-dimensional array microphone with improved directivity
US11552611B2 (en) 2020-02-07 2023-01-10 Shure Acquisition Holdings, Inc. System and method for automatic adjustment of reference gain
US11706562B2 (en) 2020-05-29 2023-07-18 Shure Acquisition Holdings, Inc. Transducer steering and configuration systems and methods using a local positioning system
JP2024505068A (en) 2021-01-28 2024-02-02 シュアー アクイジッション ホールディングス インコーポレイテッド Hybrid audio beamforming system

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US5274705A (en) * 1991-09-24 1993-12-28 Tellabs Inc. Nonlinear processor for an echo canceller and method
US5475731A (en) * 1994-01-07 1995-12-12 Ericsson Inc. Echo-canceling system and method using echo estimate to modify error signal

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US5263019A (en) * 1991-01-04 1993-11-16 Picturetel Corporation Method and apparatus for estimating the level of acoustic feedback between a loudspeaker and microphone
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Patent Citations (2)

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US5274705A (en) * 1991-09-24 1993-12-28 Tellabs Inc. Nonlinear processor for an echo canceller and method
US5475731A (en) * 1994-01-07 1995-12-12 Ericsson Inc. Echo-canceling system and method using echo estimate to modify error signal

Also Published As

Publication number Publication date
EP0950309A2 (en) 1999-10-20
MY118791A (en) 2005-01-31
BR9713809A (en) 2000-01-25
CO4810277A1 (en) 1999-06-30
AU7893798A (en) 1998-07-31
US6301357B1 (en) 2001-10-09
CN1247663A (en) 2000-03-15
CN1127840C (en) 2003-11-12
WO1998030009A2 (en) 1998-07-09
EE9900267A (en) 2000-02-15
AR011344A1 (en) 2000-08-16

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