HK34296A - Speakerphone with echo canceller-suppressor - Google Patents

Speakerphone with echo canceller-suppressor

Info

Publication number
HK34296A
HK34296A HK34296A HK34296A HK34296A HK 34296 A HK34296 A HK 34296A HK 34296 A HK34296 A HK 34296A HK 34296 A HK34296 A HK 34296A HK 34296 A HK34296 A HK 34296A
Authority
HK
Hong Kong
Prior art keywords
speakerphone
suppressor
echo canceller
canceller
echo
Prior art date
Application number
HK34296A
Other languages
English (en)
Inventor
William Albert Ford
Original Assignee
At & T Corp
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 At & T Corp filed Critical At & T Corp
Publication of HK34296A publication Critical patent/HK34296A/xx

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
    • 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
    • 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
    • H04M2201/00—Electronic components, circuits, software, systems or apparatus used in telephone systems
    • H04M2201/26—A/D convertors

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)
HK34296A 1989-05-30 1996-02-29 Speakerphone with echo canceller-suppressor HK34296A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/358,030 US5016271A (en) 1989-05-30 1989-05-30 Echo canceler-suppressor speakerphone

Publications (1)

Publication Number Publication Date
HK34296A true HK34296A (en) 1996-03-08

Family

ID=23408016

Family Applications (1)

Application Number Title Priority Date Filing Date
HK34296A HK34296A (en) 1989-05-30 1996-02-29 Speakerphone with echo canceller-suppressor

Country Status (5)

Country Link
US (1) US5016271A (xx)
EP (1) EP0400979B1 (xx)
KR (1) KR0158449B1 (xx)
CA (1) CA2017898C (xx)
HK (1) HK34296A (xx)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2634946B2 (ja) * 1990-11-19 1997-07-30 日本電気株式会社 ハンズフリー補助回路
JPH06232957A (ja) * 1993-01-29 1994-08-19 Toshiba Corp 音声通信装置
JPH06338829A (ja) * 1993-05-28 1994-12-06 American Teleph & Telegr Co <Att> 通信システム内の反響除去方法と装置
US5390244A (en) * 1993-09-10 1995-02-14 Polycom, Inc. Method and apparatus for periodic signal detection
FR2710211A1 (fr) * 1993-09-13 1995-03-24 Trt Telecom Radio Electr Dispositif de détection de rupture de ligne et modem comportant un tel dispositif.
US5668871A (en) * 1994-04-29 1997-09-16 Motorola, Inc. Audio signal processor and method therefor for substantially reducing audio feedback in a cummunication unit
JPH08204619A (ja) * 1995-01-26 1996-08-09 Nec Corp エコーサプレッサ
JP2928130B2 (ja) * 1995-04-19 1999-08-03 埼玉日本電気株式会社 ハンズフリー通信装置
US5687227A (en) * 1995-05-25 1997-11-11 Lucent Technologies, Inc. Telephone with user recorded ringing signal
US5646990A (en) * 1995-09-21 1997-07-08 Rockwell International Corporation Efficient speakerphone anti-howling system
US5612996A (en) * 1995-09-21 1997-03-18 Rockwell International Corporation Loop gain processing system for speakerphone applications
US5668794A (en) * 1995-09-29 1997-09-16 Crystal Semiconductor Variable gain echo suppressor
US5892823A (en) * 1996-03-27 1999-04-06 Hello Direct, Inc. Smart interface technology
US6044068A (en) * 1996-10-01 2000-03-28 Telefonaktiebolaget Lm Ericsson Silence-improved echo canceller
US5982755A (en) * 1997-03-06 1999-11-09 Nortel Networks Corporation System and method for providing high terminal coupling loss in a handsfree terminal
KR100283170B1 (ko) 1998-11-04 2001-03-02 윤종용 반향제거 장치 및 방법
US6678254B1 (en) 1999-05-03 2004-01-13 Nortel Networks Limited Method and communication device for optimizing echo cancellation
US6487178B1 (en) 1999-05-12 2002-11-26 Ericsson Inc. Methods and apparatus for providing volume control in communicating systems including a linear echo canceler
SE514793C2 (sv) 1999-05-31 2001-04-23 Ericsson Telefon Ab L M Förfarande och system för linjenivåjustering mellan nätverk
GB2369001A (en) * 1999-09-07 2002-05-15 Dspc Tech Ltd Suppression of residual acoustic echo
US6959167B1 (en) * 2000-08-11 2005-10-25 Scansoft, Inc. Noise-level adaptive residual echo suppressor
US6961422B2 (en) * 2001-12-28 2005-11-01 Avaya Technology Corp. Gain control method for acoustic echo cancellation and suppression
US7065207B2 (en) * 2003-09-11 2006-06-20 Freescale Semiconductor, Inc. Controlling attenuation during echo suppression
CA2481629A1 (en) * 2004-09-15 2006-03-15 Dspfactory Ltd. Method and system for active noise cancellation
KR100764788B1 (ko) * 2006-03-16 2007-10-11 엘지전자 주식회사 이동통신 단말기 및 이동통신 단말기의 음성신호 송신방법
US20080037451A1 (en) * 2006-07-28 2008-02-14 Motorola, Inc. Neutralization of acoustic echo cancellation in presence of signal clipping
US8447595B2 (en) * 2010-06-03 2013-05-21 Apple Inc. Echo-related decisions on automatic gain control of uplink speech signal in a communications device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2404969A1 (fr) * 1977-10-03 1979-04-27 Cit Alcatel Demi-suppresseur d'echo pour une ligne telephonique a quatre fils
US4360712A (en) * 1979-09-05 1982-11-23 Communications Satellite Corporation Double talk detector for echo cancellers
JPS5797262A (en) * 1980-12-09 1982-06-16 Nippon Telegr & Teleph Corp <Ntt> Loud speaker telephone set system
JPS58142641A (ja) * 1982-02-18 1983-08-24 Toshiba Corp 反響打消し装置
US4600815A (en) * 1982-07-30 1986-07-15 Communications Satellite Corporation Automatic gain control for echo cancellers and similar adaptive systems
JPS59167128A (ja) * 1983-03-14 1984-09-20 Toshiba Corp 反響打消し装置
FR2564667B1 (fr) * 1984-05-15 1986-09-19 Trt Telecom Radio Electr Dispositif de commande d'un annuleur d'echo et d'un ecreteur de centre
US4629829A (en) * 1984-12-14 1986-12-16 Motorola, Inc. Full duplex speakerphone for radio and landline telephones
FR2612029B1 (fr) * 1987-03-03 1989-05-12 Connan Jean Louis Dispositif pour la realisation de la fonction " mains-libres " dans un poste telephonique, associant les fonctions de commutation de gain et d'annulation d'echo

Also Published As

Publication number Publication date
KR900019528A (ko) 1990-12-24
CA2017898C (en) 1994-08-02
EP0400979A2 (en) 1990-12-05
KR0158449B1 (ko) 1998-12-01
US5016271A (en) 1991-05-14
EP0400979B1 (en) 1995-10-25
EP0400979A3 (en) 1992-04-22
CA2017898A1 (en) 1990-11-30

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Legal Events

Date Code Title Description
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)