GB1562937A - Conference circuits - Google Patents

Conference circuits Download PDF

Info

Publication number
GB1562937A
GB1562937A GB42429/77A GB4242977A GB1562937A GB 1562937 A GB1562937 A GB 1562937A GB 42429/77 A GB42429/77 A GB 42429/77A GB 4242977 A GB4242977 A GB 4242977A GB 1562937 A GB1562937 A GB 1562937A
Authority
GB
United Kingdom
Prior art keywords
conference
ports
signals
port
signal
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
Application number
GB42429/77A
Other languages
English (en)
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.)
AT&T Inc
Original Assignee
Western Electric 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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB1562937A publication Critical patent/GB1562937A/en
Expired legal-status Critical Current

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
    • H04M3/561—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities by multiplexing

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
GB42429/77A 1976-10-18 1977-10-12 Conference circuits Expired GB1562937A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/733,380 US4049920A (en) 1976-10-18 1976-10-18 Analog signal summing conference circuit

Publications (1)

Publication Number Publication Date
GB1562937A true GB1562937A (en) 1980-03-19

Family

ID=24947369

Family Applications (1)

Application Number Title Priority Date Filing Date
GB42429/77A Expired GB1562937A (en) 1976-10-18 1977-10-12 Conference circuits

Country Status (10)

Country Link
US (1) US4049920A (enExample)
JP (1) JPS5915548B2 (enExample)
CA (1) CA1090927A (enExample)
CH (1) CH624520A5 (enExample)
DE (1) DE2746624C2 (enExample)
FR (1) FR2368186A1 (enExample)
GB (1) GB1562937A (enExample)
IT (1) IT1087789B (enExample)
NL (1) NL7711366A (enExample)
SE (1) SE7711282L (enExample)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7807043A (nl) * 1977-07-19 1979-01-23 Siemens Ag Schakelinichting voor het omzetten van analoge signalen in digitale signalen en omgekeerd.
US4253000A (en) * 1979-01-18 1981-02-24 Rolm Corporation Method and system for reducing conference bridge oscillations
US4293946A (en) * 1979-11-21 1981-10-06 International Telephone And Telegraph Corporation Trilateral duplex path conferencing system with broadcast capability
US4340960A (en) * 1980-07-25 1982-07-20 Bell Telephone Laboratories, Incorporated Time division switching system
NL8006518A (nl) * 1980-12-01 1982-07-01 Philips Nv Conferentiestelsel voor telefonie.
GB2110057B (en) * 1981-10-22 1986-06-25 Bloomfield James Warman Improvements in and relating to telephone conference amplifiers, and telephone conference bridges incorporating the same
US4558180A (en) * 1983-10-25 1985-12-10 At&T Bell Laboratories Programmable audio mixer
SE449152B (sv) * 1986-03-19 1987-04-06 Paul Gosta Wilhelm Rosen Kommunikationsanleggning innefattande ett flertal enheter vilka kan uppretthalla en konferenskoppling
US5231629A (en) * 1990-10-01 1993-07-27 Motorola, Inc. Full-duplex communication system
DE4126814A1 (de) * 1991-08-09 1993-02-11 Deutsche Telephonwerk Kabel Schaltungsanordnung fuer eine konferenzeinrichtung
JPH069555U (ja) * 1992-07-14 1994-02-08 株式会社河合楽器製作所 収納ケース
US20040190701A1 (en) * 2003-03-28 2004-09-30 Versatel Networks Inc. Apparatus and method for a distributed conference bridge

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3108157A (en) * 1959-06-15 1963-10-22 Bell Telephone Labor Inc Multiple station communication circuit
CH408129A (de) * 1963-11-17 1966-02-28 Standard Telephon & Radio Ag Konferenzschaltung für Telephon- Teilnehmer
CH489161A (de) * 1963-11-17 1970-04-15 Standard Telephon & Radio Ag Konferenzschaltung für Telephon-Teilnehmer
NL7016339A (enExample) * 1970-11-09 1972-05-12
JPS5544752B2 (enExample) * 1973-02-01 1980-11-13
US3828146A (en) * 1973-03-22 1974-08-06 Bell Telephone Labor Inc Time division conference hybrid circuit
US3835259A (en) * 1973-03-22 1974-09-10 Bell Telephone Labor Inc Time division conference hybrid circuit
JPS5052064A (enExample) * 1973-09-11 1975-05-09
US3857835A (en) * 1974-01-25 1974-12-31 Morton Norwich Products Inc 1-(5-(p-nitro phenyl)furfurylidene) amino)-5,6-dihydrouracil
US3843636A (en) * 1974-01-25 1974-10-22 Morton Norwich Products Inc 1-(5-(p-methoxyphenyl)furfurylidene)amino)hydantoin
US3882276A (en) * 1974-03-22 1975-05-06 Bell Telephone Labor Inc Conferencing system utilizing oppositely phased hybrids
US3991280A (en) * 1975-05-23 1976-11-09 Bell Telephone Laboratories, Incorporated Monobus variable resistance transmission circuit

Also Published As

Publication number Publication date
JPS5350603A (en) 1978-05-09
DE2746624C2 (de) 1983-10-27
DE2746624A1 (de) 1978-04-20
US4049920A (en) 1977-09-20
IT1087789B (it) 1985-06-04
SE7711282L (sv) 1978-04-19
CH624520A5 (enExample) 1981-07-31
NL7711366A (nl) 1978-04-20
FR2368186B1 (enExample) 1982-02-19
FR2368186A1 (fr) 1978-05-12
CA1090927A (en) 1980-12-02
JPS5915548B2 (ja) 1984-04-10

Similar Documents

Publication Publication Date Title
US3649761A (en) Dial selective wideband intercommunication system
US4049920A (en) Analog signal summing conference circuit
US4475190A (en) Method and apparatus for controlling ports in a digital conference arrangement
US3882276A (en) Conferencing system utilizing oppositely phased hybrids
US4293946A (en) Trilateral duplex path conferencing system with broadcast capability
EP0261352B1 (en) Cross point switch architecture for a micro-pbx
JPS60253361A (ja) 会議通話機能を有する交換システム
US3692947A (en) Time division switching system conference circuit
US3274342A (en) Common channel communication system conference circuit
US3689710A (en) Two-wire to four-wire conversion circuit for a data switching center
GB2145609A (en) Line transmission systems
US3399275A (en) Conference circuit with suppressed sidetones
JPS5919506B2 (ja) 電話交換機
US5263083A (en) Method and apparatus for sharing speakerphone processor among multiple users
JPH0351149B2 (enExample)
US4660219A (en) Extension ringing arrangement key telephone system
US3511931A (en) Conferencing networks employing virtual ground summation to obtain isolation
US4286114A (en) Two-wire resistance bridges for private line circuits
US3229040A (en) Telephone exchange systems
IL104106A (en) A method of transmitting signals in remote communications
US2189994A (en) Telephone system
US2230360A (en) Multiway telephone circuit
US1812169A (en) Selective program service system
JPS59156058A (ja) 多対地点間接続方式
JPS61125268A (ja) 個別電話番号方式

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee