SE7905958L - Konferenskoppling - Google Patents

Konferenskoppling

Info

Publication number
SE7905958L
SE7905958L SE7905958A SE7905958A SE7905958L SE 7905958 L SE7905958 L SE 7905958L SE 7905958 A SE7905958 A SE 7905958A SE 7905958 A SE7905958 A SE 7905958A SE 7905958 L SE7905958 L SE 7905958L
Authority
SE
Sweden
Prior art keywords
circuit
amplification
conference circuit
subscriber stations
conference
Prior art date
Application number
SE7905958A
Other languages
Unknown language ( )
English (en)
Other versions
SE443270B (sv
Inventor
R G Sparber
Original Assignee
Western Electric Co
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 Western Electric Co filed Critical Western Electric Co
Publication of SE7905958L publication Critical patent/SE7905958L/sv
Publication of SE443270B publication Critical patent/SE443270B/sv

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
SE7905958A 1978-07-17 1979-07-09 Konferenskrets SE443270B (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/925,190 US4197429A (en) 1978-07-17 1978-07-17 Gain-adjusting conference circuit

Publications (2)

Publication Number Publication Date
SE7905958L true SE7905958L (sv) 1980-01-18
SE443270B SE443270B (sv) 1986-02-17

Family

ID=25451355

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7905958A SE443270B (sv) 1978-07-17 1979-07-09 Konferenskrets

Country Status (8)

Country Link
US (1) US4197429A (sv)
JP (1) JPS5547759A (sv)
CA (1) CA1119329A (sv)
DE (1) DE2928265C2 (sv)
FR (1) FR2431804A1 (sv)
GB (1) GB2025738B (sv)
NL (1) NL7905528A (sv)
SE (1) SE443270B (sv)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2861171D1 (en) * 1977-12-05 1981-12-24 Post Office A control unit for establishing a four-wire link via a pair of telephone lines
US4316059A (en) * 1980-06-10 1982-02-16 Northern Telecom Limited Gain controller for a teleconferencing bridge
US4499578A (en) * 1982-05-27 1985-02-12 At&T Bell Laboratories Method and apparatus for controlling signal level in a digital conference arrangement
US4535445A (en) * 1983-06-16 1985-08-13 At&T Information Systems Conferencing system adaptive signal conditioner
ATE38604T1 (de) * 1984-02-29 1988-11-15 Hertz Inst Heinrich Nachrichtensystem fuer bildkonferenzen.
US5471527A (en) 1993-12-02 1995-11-28 Dsc Communications Corporation Voice enhancement system and method
US5712954A (en) * 1995-08-23 1998-01-27 Rockwell International Corp. System and method for monitoring audio power level of agent speech in a telephonic switch
US20060136200A1 (en) * 2004-12-22 2006-06-22 Rhemtulla Amin F Intelligent active talker level control

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050584A (en) * 1958-12-24 1962-08-21 American Telephone & Telegraph Conference telephone apparatus
US3423538A (en) * 1964-12-28 1969-01-21 Bell Telephone Labor Inc Telephone conference circuit
US3441678A (en) * 1965-09-03 1969-04-29 Bell Telephone Labor Inc Conference circuit with selective call splitting
US3991279A (en) * 1975-05-23 1976-11-09 Bell Telephone Laboratories, Incorporated Monobus interface circuit

Also Published As

Publication number Publication date
FR2431804A1 (fr) 1980-02-15
DE2928265A1 (de) 1980-01-31
US4197429A (en) 1980-04-08
GB2025738B (en) 1982-08-18
NL7905528A (nl) 1980-01-21
GB2025738A (en) 1980-01-23
JPS5547759A (en) 1980-04-04
DE2928265C2 (de) 1985-07-04
CA1119329A (en) 1982-03-02
SE443270B (sv) 1986-02-17

Similar Documents

Publication Publication Date Title
GB1167741A (en) Photon-coupled Circuit
CA1274009C (en) TDMA COMMUNICATION SYSTEM USING COMMON LOCAL PATH MEDIA AND LOCAL WINDOWS FOR INTER-OFFICE CALLS
CA2019176A1 (en) Subscriber line interface circuit in a switching system
SE7905958L (sv) Konferenskoppling
KR900001337B1 (en) Switching system having capability for tele communication conferences
GB1084001A (en) Improvements in or relating to switching networks
US3787630A (en) Time division communication system
JPS6417522A (en) Track moving body tracing exchange system
GB1471364A (en) Electronic telephone system
ES476875A1 (es) Disposicion de timbre para empalme de central telefonica con unidad de mando centralizada.
JPS5718153A (en) Plural trunk connection system
DE3462651D1 (en) Switching system
JPS57133755A (en) Branch coupling circuit for conference telephone set
JPS5489408A (en) Subscribersigma circuit
FR2450541A1 (fr) Reseau de connexion pour conference telephonique en mia
SU579703A1 (ru) Устройство групповой громкоговор щей телефонной св зи
GB1034827A (en) Telephone systems with conference call facility
ES481406A1 (es) Un circuito para compensar las perdidas en las vias que se prolongan a traves de mallas de conmutacion en los sistemas de conmutacion telefonicos.
JPS54124906A (en) Channel control system of automatic switchboard
GB1489741A (en) Telecommunication system networks
JPS5781758A (en) Signal transmitting system of switchboard
SU801304A1 (ru) Устройство циркул рной св зи
JPS5455306A (en) Multi-address communication system of time-division switchboard
GB1277188A (en) Telephone conference circuit
JPS57148454A (en) Compound switching system

Legal Events

Date Code Title Description
NUG Patent has lapsed

Ref document number: 7905958-0

Effective date: 19900702

Format of ref document f/p: F