BE899159R - Systeme telephonique a haut-parleur. - Google Patents

Systeme telephonique a haut-parleur.

Info

Publication number
BE899159R
BE899159R BE2/60360A BE2060360A BE899159R BE 899159 R BE899159 R BE 899159R BE 2/60360 A BE2/60360 A BE 2/60360A BE 2060360 A BE2060360 A BE 2060360A BE 899159 R BE899159 R BE 899159R
Authority
BE
Belgium
Prior art keywords
attenuator
telephone system
loudspeaker
loudspeaker telephone
caller
Prior art date
Application number
BE2/60360A
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
Application filed by Int Standard Electric Corp filed Critical Int Standard Electric Corp
Application granted granted Critical
Publication of BE899159R publication Critical patent/BE899159R/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)
  • Interface Circuits In Exchanges (AREA)

Abstract

Pendant une conversation utilisant le haut-parleur, des codes numériques représentant les amplitudes de la parole en provenance de l'appelant vers l'appelé et vice-versa sont continuellement pris des cases de mémoire dans 5 en l'adressant par l'intermédiaire de l'atténuateur 1 et ils sont réinscrits dans d'autres cases de mémoire du réseau de commutation numérique. Le circuit de commande surveille un échantillon sur quatre parmi ceux transmis ou reçus pour chaque canal et de cette information, il dérive des paramètres de commande qui établissent la valeur de l'atténuation de chaque échantillon par l'intermédiaire de l'atténuateur 1.
BE2/60360A 1983-03-15 1984-03-15 Systeme telephonique a haut-parleur. BE899159R (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08307143A GB2137049B (en) 1983-03-15 1983-03-15 Handsfree telephone

Publications (1)

Publication Number Publication Date
BE899159R true BE899159R (fr) 1984-09-17

Family

ID=10539624

Family Applications (1)

Application Number Title Priority Date Filing Date
BE2/60360A BE899159R (fr) 1983-03-15 1984-03-15 Systeme telephonique a haut-parleur.

Country Status (7)

Country Link
US (1) US4564939A (fr)
EP (1) EP0118920A3 (fr)
JP (1) JPS6016751A (fr)
AU (1) AU2549184A (fr)
BE (1) BE899159R (fr)
ES (1) ES8503908A1 (fr)
GB (1) GB2137049B (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137454A (en) * 1983-03-01 1984-10-03 Standard Telephones Cables Ltd Handsfree telephone system
GB2197166A (en) * 1986-11-07 1988-05-11 Storno As Controlling gain in speech-controlled telephones
US4794520A (en) * 1987-03-30 1988-12-27 C-Guard Laboratories, Inc. Interface system for computer port sharing of multiple devices
US5410595A (en) * 1992-11-12 1995-04-25 Motorola, Inc. Apparatus and method for noise reduction for a full-duplex speakerphone or the like
US5353348A (en) * 1993-05-14 1994-10-04 Jrc International, Inc. Double echo cancelling system
US5323458A (en) * 1993-10-25 1994-06-21 Motorola Inc. Echo cancellation in a full-duplex speakerphone

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO134477C (fr) * 1974-10-29 1976-10-13 Manus Max
US3976847A (en) * 1975-11-12 1976-08-24 Bell Telephone Laboratories, Incorporated Key telephone system intercom arrangement
DE2638286C3 (de) * 1976-08-25 1979-03-01 Dasy Inter S.A., Genf (Schweiz) Schaltungsanordnung für ein Freisprechertelefon
DE2659028C3 (de) * 1976-12-27 1979-05-31 Dasy Inter S.A., Genf (Schweiz) Schaltungsanordnung zum Verhindern von Rückkopplungen
US4063047A (en) * 1977-03-04 1977-12-13 Bell Telephone Laboratories, Incorporated Key telephone system multilink hands free answer circuit
US4123626A (en) * 1977-11-23 1978-10-31 Northern Telecom Limited Digital echo attenuation circuit for a telephone system
FR2412210A1 (fr) * 1977-12-14 1979-07-13 Cit Alcatel Poste telephonique a haut-parleur
JPS5919506B2 (ja) * 1978-04-14 1984-05-07 株式会社東芝 電話交換機
CA1166777A (fr) * 1981-03-23 1984-05-01 Gordon D. Benning Central telephonique domestique
DE3137314C2 (de) * 1981-09-16 1984-03-29 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung für sprachgesteuerte Freisprechgeräte

Also Published As

Publication number Publication date
EP0118920A2 (fr) 1984-09-19
ES530643A0 (es) 1985-03-16
JPS6016751A (ja) 1985-01-28
GB8307143D0 (en) 1983-04-20
GB2137049B (en) 1986-05-14
ES8503908A1 (es) 1985-03-16
GB2137049A (en) 1984-09-26
EP0118920A3 (fr) 1985-10-23
AU2549184A (en) 1984-09-20
US4564939A (en) 1986-01-14

Similar Documents

Publication Publication Date Title
US4577310A (en) Station interface for digital electronic telephone switching system having centralized digital audio processor
US5351288A (en) Voice bridge for a relay center
US5592473A (en) Private branch exchange system and methods for operating same
DE69331264T2 (de) Automatisiertes peripheres fernmeldesystem
FR2416599A1 (fr) Systeme de commutation telephonique a repartition dans le temps
FR2430151A1 (fr) Dispositif de protection contre les defauts dans un systeme de commutation
FR2390877A1 (fr) Reseau de commutation pour dispositif temporel mic
EP0202422B1 (fr) Système adaptatif de concentration de lignes de jonction
FR2440666A1 (fr) Circuit de conference numerique
US4380064A (en) Digital audio signal control system for a timedivision switching system
BE899159R (fr) Systeme telephonique a haut-parleur.
BE886273A (fr) Systeme de commutation numerique de telecommunications capable d'etablir des connexions multilaterales de teleconference et de diffusion selective d'informations ou de signaux
GB1529106A (en) Method and apparatus for establishing a plurality of simultaneous conferences in a pcm switching system
CA1331799C (fr) Circuit de haut-parleur mic additif pour installation de conference rnis a partage du temps
GB892399A (en) Improvements in or relating to telecommunication systems
BE900797A (fr) Poste telephonique de secretariat combine a un standard de secretariat.
JPH0357670B2 (fr)
FR2382819A1 (fr) Systeme de commutation numerique a commande repartie
SU1552407A1 (ru) Устройство служебно-диспетчерской св зи
KR100528742B1 (ko) 교환시스템의 다자간 회의통화장치
DE58906158D1 (de) Digitale Zeitmultiplex-Fernmeldevermittlungsanlage.
JPS5854716B2 (ja) パス切断方式
JP2590089B2 (ja) 時分割多重交換装置
CA1310094C (fr) Circuit additif mic pour locuteur de conference en temps partage
JPS6343942B2 (fr)

Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: INTERNATIONAL STANDARD ELECTRIC CORP.

Effective date: 19870331