GB1505175A - Telephone conference circuit - Google Patents

Telephone conference circuit

Info

Publication number
GB1505175A
GB1505175A GB23390/75A GB2339075A GB1505175A GB 1505175 A GB1505175 A GB 1505175A GB 23390/75 A GB23390/75 A GB 23390/75A GB 2339075 A GB2339075 A GB 2339075A GB 1505175 A GB1505175 A GB 1505175A
Authority
GB
United Kingdom
Prior art keywords
telephone conference
circuits
conference circuit
coupling arrangements
telephone
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
GB23390/75A
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 Corp
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 GB1505175A publication Critical patent/GB1505175A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Telephonic Communication Services (AREA)
GB23390/75A 1974-05-31 1975-05-29 Telephone conference circuit Expired GB1505175A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US474879A US3885100A (en) 1974-05-31 1974-05-31 Six-port conference amplifier circuit

Publications (1)

Publication Number Publication Date
GB1505175A true GB1505175A (en) 1978-03-30

Family

ID=23885317

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23390/75A Expired GB1505175A (en) 1974-05-31 1975-05-29 Telephone conference circuit

Country Status (10)

Country Link
US (1) US3885100A (enExample)
JP (1) JPS5444564B2 (enExample)
BE (1) BE829496A (enExample)
CA (1) CA1010167A (enExample)
DE (1) DE2523620C3 (enExample)
FR (1) FR2275947A1 (enExample)
GB (1) GB1505175A (enExample)
IT (1) IT1038507B (enExample)
NL (1) NL7506454A (enExample)
SE (1) SE399501B (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163871A (en) * 1977-12-22 1979-08-07 International Telephone And Telegraph Corporation Digital CVSD telephone conference circuit
DE3144267C2 (de) * 1981-11-07 1984-08-30 Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg Verfahren und Schaltungsanordnung zum Aufbau von Konferenzverbindungen in Fernmeldeanlagen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR680306A (enExample) * 1929-06-22 1930-04-26
US3108157A (en) * 1959-06-15 1963-10-22 Bell Telephone Labor Inc Multiple station communication circuit
US3527889A (en) * 1967-03-01 1970-09-08 New North Electric Co Conference communication system
GB1395495A (en) * 1971-06-30 1975-05-29 Post Office Telephone conference amplifier
JPS494764A (enExample) * 1972-04-27 1974-01-16
US3767861A (en) * 1972-08-31 1973-10-23 Gte Automatic Electric Lab Inc 3 to 10 port conference circuit
US3824344A (en) * 1973-03-22 1974-07-16 Bell Telephone Labor Inc Conference bridge circuit

Also Published As

Publication number Publication date
DE2523620A1 (de) 1975-12-11
NL7506454A (nl) 1975-12-02
BE829496A (fr) 1975-11-26
DE2523620C3 (de) 1981-09-10
FR2275947A1 (fr) 1976-01-16
DE2523620B2 (de) 1980-11-27
US3885100A (en) 1975-05-20
JPS5444564B2 (enExample) 1979-12-26
FR2275947B1 (enExample) 1977-07-22
IT1038507B (it) 1979-11-30
SE7505799L (sv) 1975-12-01
JPS513503A (enExample) 1976-01-13
SE399501B (sv) 1978-02-13
CA1010167A (en) 1977-05-10

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Legal Events

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