BE899042R - Systeme telephonique a haut-parleur - Google Patents

Systeme telephonique a haut-parleur

Info

Publication number
BE899042R
BE899042R BE2/60356A BE2060356A BE899042R BE 899042 R BE899042 R BE 899042R BE 2/60356 A BE2/60356 A BE 2/60356A BE 2060356 A BE2060356 A BE 2060356A BE 899042 R BE899042 R BE 899042R
Authority
BE
Belgium
Prior art keywords
threshold amplitude
channels
loudspeaker telephone
telephone system
exceeded
Prior art date
Application number
BE2/60356A
Other languages
English (en)
Inventor
B N Hansen
Original Assignee
Int Standard Electric 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10538762&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=BE899042(R) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Int Standard Electric Corp filed Critical Int Standard Electric Corp
Application granted granted Critical
Publication of BE899042R publication Critical patent/BE899042R/fr

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Telephonic Communication Services (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Noise Elimination (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Arrangement de circuit électrique utilisé en relation avec un poste téléphonique à haut-parleur, dans lequel chacun desdits canaux est échantillonné et les résultats sont chacun comparés avec une amplitude de seuil préétablie, dans lequel le niveau du bruit de fond des canaux est surveillé et l'amplitude de seuil pour chacun desdits canaux est ajustée afin d'etre au moins égale au niveau de bruit tel que détecté, de telle sorte que le canal pour lequel l'amplitude de seuil courante est dépassée est activé tandis qu'un canal pour lequel l'amplitude de seuil courante n'a pas été dépassée est inhibé.
BE2/60356A 1983-03-01 1984-03-01 Systeme telephonique a haut-parleur BE899042R (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08305572A GB2137458B (en) 1983-03-01 1983-03-01 Digital handsfree telephone

Publications (1)

Publication Number Publication Date
BE899042R true BE899042R (fr) 1984-09-03

Family

ID=10538762

Family Applications (1)

Application Number Title Priority Date Filing Date
BE2/60356A BE899042R (fr) 1983-03-01 1984-03-01 Systeme telephonique a haut-parleur

Country Status (8)

Country Link
US (1) US4560840A (fr)
EP (1) EP0120325B1 (fr)
JP (1) JPS59210758A (fr)
AU (1) AU2505684A (fr)
BE (1) BE899042R (fr)
DE (1) DE3471221D1 (fr)
ES (1) ES8503907A1 (fr)
GB (1) GB2137458B (fr)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712231A (en) * 1984-04-06 1987-12-08 Shure Brothers, Inc. Teleconference system
US4706274A (en) * 1984-05-11 1987-11-10 Southwestern Bell Telecommunications, Inc. Cordless telephone system
US4696032A (en) * 1985-02-26 1987-09-22 Siemens Corporate Research & Support, Inc. Voice switched gain system
US4715062A (en) * 1985-03-22 1987-12-22 Tie/Communications, Inc. Speakerphone control circuit having low gain states and method for controlling gain of speakerphone
GB2174578B (en) * 1985-05-04 1988-11-09 Stc Plc Loud speaking telephone
CA1233925A (fr) * 1985-05-10 1988-03-08 Gordon J. Reesor Telephone numerique a haut-parleur
US4748665A (en) * 1985-07-01 1988-05-31 Rockwell International Corporation Analog echo suppressor
US5022074A (en) * 1985-07-01 1991-06-04 Rockwell International Corporation Digital echo suppressor
US4700382A (en) * 1986-03-03 1987-10-13 American Telephone And Telegraph Company, At&T Information Systems, Inc. Voice-switched telephone circuit with center idle state
JPH0622344B2 (ja) * 1986-07-26 1994-03-23 日本電気株式会社 移動通信システム
JPS63108251U (fr) * 1986-12-27 1988-07-12
US4851104A (en) * 1987-02-27 1989-07-25 General Signal Corporation Instrument for potentiometric electrochemical measurements
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
US4741018A (en) * 1987-04-24 1988-04-26 Motorola, Inc. Speakerphone using digitally compressed audio to control voice path gain
US4843621A (en) * 1987-04-24 1989-06-27 Motorola, Inc. Speakerphone using digitally compressed audio to detect acoustic feedback
DE3810068A1 (de) * 1988-03-25 1989-10-05 Telefonbau & Normalzeit Gmbh Verfahren zur erkennung von sprachsignalen
FR2636797B1 (fr) * 1988-09-16 1990-11-09 Sgs Thomson Microelectronics Circuit integre pour poste telephonique avec detecteur d'enveloppe de signal
US5007046A (en) * 1988-12-28 1991-04-09 At&T Bell Laboratories Computer controlled adaptive speakerphone
US5199064A (en) * 1990-12-03 1993-03-30 Advanced Micro Devices, Inc. Fully-integrated telephone unit
DE4130045A1 (de) * 1991-09-10 1993-03-18 Standard Elektrik Lorenz Ag Schaltungsanordnung zur dynamiksteuerung eines sprachendgeraetes
GB2278984A (en) * 1993-06-11 1994-12-14 Redifon Technology Limited Speech presence detector
FI108830B (fi) * 1993-12-23 2002-03-28 Nokia Corp Menetelmä ja laite kaiun vaimentamiseksi puhelinlaitteessa
US6535604B1 (en) 1998-09-04 2003-03-18 Nortel Networks Limited Voice-switching device and method for multiple receivers
EP1163787A2 (fr) * 1999-03-15 2001-12-19 Vocaltec Communications Ltd. Dispositif et procede de suppression d'echo
GB2375688B (en) * 2001-05-14 2004-09-29 Motorola Ltd Telephone apparatus and a communication method using such apparatus
EP1722545B1 (fr) 2005-05-09 2008-08-13 Mitel Networks Corporation Procédé et système pour réduire le temps d'apprentissage d'un canceller d'écho acoustique dans un système de conférence entièrement bidirectionnel utilisant une formation de faisceau acoustique

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL267461A (fr) * 1960-10-04 1900-01-01
GB979825A (en) * 1962-03-09 1965-01-06 Gylling & Co Ab Amplifier for two way speech transmission
GB1261521A (en) * 1968-02-05 1972-01-26 Post Office Improvements in or relating to telecommunication systems
US3751602A (en) * 1971-08-13 1973-08-07 Bell Telephone Labor Inc Loudspeaking telephone
FR2255762B1 (fr) * 1973-12-21 1976-07-23 Ibm France
US3970786A (en) * 1974-06-27 1976-07-20 Stromberg-Carlson Corporation Loudspeaking telephone with improved receive sensitivity
CA996692A (en) * 1974-12-12 1976-09-07 Russell W. Brown Digital control of a loudspeaking telephone system
DE2651688A1 (de) * 1976-11-12 1978-05-24 Siemens Ag Schaltungsanordnung fuer sprachgesteuerte freisprechgeraete
JPS5797262A (en) * 1980-12-09 1982-06-16 Nippon Telegr & Teleph Corp <Ntt> Loud speaker telephone set system
US4465902A (en) * 1982-10-08 1984-08-14 Zenith Electronics Corporation Digital space phone system

Also Published As

Publication number Publication date
AU2505684A (en) 1984-09-06
GB2137458A (en) 1984-10-03
DE3471221D1 (en) 1988-06-16
EP0120325A1 (fr) 1984-10-03
EP0120325B1 (fr) 1988-05-11
ES530194A0 (es) 1985-03-16
US4560840A (en) 1985-12-24
GB2137458B (en) 1986-11-19
GB8305572D0 (en) 1983-03-30
ES8503907A1 (es) 1985-03-16
JPS59210758A (ja) 1984-11-29

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: INTERNATIONAL STANDARD ELECTRIC CORP.

Effective date: 19870331