DE68919641T2 - Halbduplex-Lautfernsprecher. - Google Patents

Halbduplex-Lautfernsprecher.

Info

Publication number
DE68919641T2
DE68919641T2 DE68919641T DE68919641T DE68919641T2 DE 68919641 T2 DE68919641 T2 DE 68919641T2 DE 68919641 T DE68919641 T DE 68919641T DE 68919641 T DE68919641 T DE 68919641T DE 68919641 T2 DE68919641 T2 DE 68919641T2
Authority
DE
Germany
Prior art keywords
loudspeaker
duplex
duplex loudspeaker
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 - Fee Related
Application number
DE68919641T
Other languages
English (en)
Other versions
DE68919641D1 (de
Inventor
Ygal Arbel
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.)
Siemens Communications Inc
Original Assignee
Rolm Co 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 Rolm Co Inc filed Critical Rolm Co Inc
Publication of DE68919641D1 publication Critical patent/DE68919641D1/de
Application granted granted Critical
Publication of DE68919641T2 publication Critical patent/DE68919641T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • H04M9/085—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 digital techniques
    • 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
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency

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)
DE68919641T 1988-10-12 1989-09-12 Halbduplex-Lautfernsprecher. Expired - Fee Related DE68919641T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/256,610 US4879745A (en) 1988-10-12 1988-10-12 Half-duplex speakerphone

Publications (2)

Publication Number Publication Date
DE68919641D1 DE68919641D1 (de) 1995-01-12
DE68919641T2 true DE68919641T2 (de) 1995-07-06

Family

ID=22972891

Family Applications (1)

Application Number Title Priority Date Filing Date
DE68919641T Expired - Fee Related DE68919641T2 (de) 1988-10-12 1989-09-12 Halbduplex-Lautfernsprecher.

Country Status (4)

Country Link
US (1) US4879745A (de)
EP (1) EP0364383B1 (de)
JP (1) JPH02123859A (de)
DE (1) DE68919641T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19825196A1 (de) * 1998-06-05 1999-12-09 Alcatel Sa Verfahren zur Kopplungsbestimmung zwischen zwei Telekommunikations(=TK)-Wegen

Families Citing this family (40)

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USRE36934E (en) * 1988-07-19 2000-10-31 Sgs-Thomson Microelectronics S.A. Control device for a hands-free telephone set
FR2641150B1 (de) * 1988-12-28 1991-04-19 Sgs Thomson Microelectronics
DE3908282A1 (de) * 1989-03-14 1990-09-20 Siemens Ag Sprechrichtungserkennung in einer digitalen fernsprechstation
US5010570A (en) * 1990-02-20 1991-04-23 Motorola, Inc. Method for active feedback suppression
US5134658A (en) * 1990-09-27 1992-07-28 Advanced Micro Devices, Inc. Apparatus for discriminating information signals from noise signals in a communication signal
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
DE4130045A1 (de) * 1991-09-10 1993-03-18 Standard Elektrik Lorenz Ag Schaltungsanordnung zur dynamiksteuerung eines sprachendgeraetes
CA2052351C (en) * 1991-09-27 2000-05-23 Gordon J. Reesor Telephone handsfree algorithm
US5357567A (en) * 1992-08-14 1994-10-18 Motorola, Inc. Method and apparatus for volume switched gain control
JPH06216986A (ja) * 1993-01-19 1994-08-05 Mitsubishi Electric Corp ハンズフリー通話回路
JPH06338934A (ja) * 1993-05-25 1994-12-06 Exar Corp 事象駆動型制御回路を有するスピーカーホーン
GB2278754B (en) * 1993-06-02 1997-06-18 Northern Telecom Ltd Telephone instrument
US5579389A (en) * 1993-11-24 1996-11-26 Intel Corporation Histogram-based processing of audio signals
US5566238A (en) * 1993-11-24 1996-10-15 Intel Corporation Distributed processing of audio signals
US5631967A (en) * 1993-11-24 1997-05-20 Intel Corporation Processing audio signals using a state variable
US5592547A (en) * 1993-11-24 1997-01-07 Intel Corporation Processing audio signals using a discrete state machine
JPH07297900A (ja) * 1994-04-26 1995-11-10 Mitsubishi Electric Corp 騒音対策通話機
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
US5715309A (en) * 1995-03-03 1998-02-03 Advanced Micro Devices, Inc. Conversion of compressed speech codes between attenuated and unattenuated formats
CN1141552A (zh) * 1995-05-31 1997-01-29 尾电话伴侣公司 软件扬声器电话系统与操作扬声器电话的方法
US5692042A (en) * 1995-05-31 1997-11-25 Casio Phonemate, Inc. Speakerphone controlled by a comparator with hysteresis
US5764753A (en) * 1995-09-29 1998-06-09 Crystal Semiconductor Corp. Half-duplex controller
SE505692C2 (sv) * 1995-12-18 1997-09-29 Ericsson Telefon Ab L M Förfarande och anordning för ekosläckning genom skattning av effekt hos residualsignal
US5857019A (en) * 1996-06-11 1999-01-05 Siemens Business Communication Systems, Inc. Apparatus and method for providing a telephone user with control of the threshold volume at which the user's voice will take control of a half-duplex speakerphone conversation
US5838787A (en) * 1996-06-27 1998-11-17 Northern Telecom Limited Method and system for controlling echo return loss using a complementary variolosses in transmit path
JP2000502537A (ja) * 1996-10-04 2000-02-29 フィリップス エレクトロニクス ネムローゼ フェンノートシャップ 電気通信システム、加入者ユニット、および加入者ユニットを具えるテレビジョン受像機
US5867574A (en) 1997-05-19 1999-02-02 Lucent Technologies Inc. Voice activity detection system and method
AU3188300A (en) * 1999-03-15 2000-10-04 Vocaltec Communications Ltd. Echo suppression device and method for performing the same
US6628728B1 (en) * 1999-04-28 2003-09-30 Cyntrust Communications, Inc. Nyquist filter and method
US6931124B1 (en) 2000-01-13 2005-08-16 Acoustic Technology, Inc. Soft mute circuit
US20030123644A1 (en) * 2000-01-26 2003-07-03 Harrow Scott E. Method and apparatus for removing audio artifacts
US6993126B1 (en) * 2000-04-28 2006-01-31 Clearsonics Pty Ltd Apparatus and method for detecting far end speech
US7046792B2 (en) * 2001-03-09 2006-05-16 Acoustic Technologies, Inc. Transmit/receive arbitrator
US7031458B2 (en) * 2001-10-30 2006-04-18 Integration Associates Inc. Method and apparatus for isolation in a data access arrangement using analog encoded pulse signaling
US6754337B2 (en) 2002-01-25 2004-06-22 Acoustic Technologies, Inc. Telephone having four VAD circuits
US6847930B2 (en) * 2002-01-25 2005-01-25 Acoustic Technologies, Inc. Analog voice activity detector for telephone
US7295976B2 (en) 2002-01-25 2007-11-13 Acoustic Technologies, Inc. Voice activity detector for telephone
KR100444572B1 (ko) * 2002-08-23 2004-08-16 삼성전자주식회사 원웨이 스피커폰 기능을 구비한 통신기기 및 그 제어방법
JP5651923B2 (ja) * 2009-04-07 2015-01-14 ソニー株式会社 信号処理装置及び信号処理方法
US8923508B2 (en) 2012-06-07 2014-12-30 Lsi Corporation Half-duplex speakerphone echo canceler

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3751602A (en) * 1971-08-13 1973-08-07 Bell Telephone Labor Inc Loudspeaking telephone
CA1186826A (en) * 1981-03-18 1985-05-07 Jin H. Yun Loudspeaker telephone system
GB2161047B (en) * 1984-06-28 1987-09-16 Stc Plc Improvements in telephone instruments
US4649505A (en) * 1984-07-02 1987-03-10 General Electric Company Two-input crosstalk-resistant adaptive noise canceller
GB8423017D0 (en) * 1984-09-12 1984-10-17 Plessey Co Plc Echo canceller
US4629829A (en) * 1984-12-14 1986-12-16 Motorola, Inc. Full duplex speakerphone for radio and landline telephones
JPH063950B2 (ja) * 1985-02-28 1994-01-12 株式会社東芝 拡声電話装置
US4752903A (en) * 1985-03-25 1988-06-21 Hitachi Densi Kabushiki Kaisha Adaptive digital filter for eliminating howling
CA1233925A (en) * 1985-05-10 1988-03-08 Gordon J. Reesor Digital loudspeaking telephone
US4636586A (en) * 1985-09-20 1987-01-13 Rca Corporation Speakerphone with adaptive cancellation of room echoes
US4741018A (en) * 1987-04-24 1988-04-26 Motorola, Inc. Speakerphone using digitally compressed audio to control voice path gain

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19825196A1 (de) * 1998-06-05 1999-12-09 Alcatel Sa Verfahren zur Kopplungsbestimmung zwischen zwei Telekommunikations(=TK)-Wegen

Also Published As

Publication number Publication date
DE68919641D1 (de) 1995-01-12
JPH02123859A (ja) 1990-05-11
EP0364383A3 (en) 1990-11-22
EP0364383A2 (de) 1990-04-18
JPH0586100B2 (de) 1993-12-09
EP0364383B1 (de) 1994-11-30
US4879745A (en) 1989-11-07

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: SIEMENS INFORMATION AND COMMUNICATION NETWORKS,INC

8328 Change in the person/name/address of the agent

Free format text: EPPING, W., DIPL.-ING. DR.-ING., PAT.-ANW., 80339 MUENCHEN

8339 Ceased/non-payment of the annual fee