FR2144413A5 - - Google Patents

Info

Publication number
FR2144413A5
FR2144413A5 FR7223797A FR7223797A FR2144413A5 FR 2144413 A5 FR2144413 A5 FR 2144413A5 FR 7223797 A FR7223797 A FR 7223797A FR 7223797 A FR7223797 A FR 7223797A FR 2144413 A5 FR2144413 A5 FR 2144413A5
Authority
FR
France
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
FR7223797A
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Application granted granted Critical
Publication of FR2144413A5 publication Critical patent/FR2144413A5/fr
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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/06—Control of transmission; Equalising by the transmitted signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Amplifiers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
FR7223797A 1971-06-30 1972-06-30 Expired FR2144413A5 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3069271A GB1395495A (en) 1971-06-30 1971-06-30 Telephone conference amplifier

Publications (1)

Publication Number Publication Date
FR2144413A5 true FR2144413A5 (fr) 1973-02-09

Family

ID=10311631

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7223797A Expired FR2144413A5 (fr) 1971-06-30 1972-06-30

Country Status (6)

Country Link
US (1) US3816917A (fr)
BE (1) BE785738A (fr)
CA (1) CA965890A (fr)
FR (1) FR2144413A5 (fr)
GB (1) GB1395495A (fr)
NL (1) NL171217C (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885100A (en) * 1974-05-31 1975-05-20 Bell Telephone Labor Inc Six-port conference amplifier circuit
GB1559839A (en) * 1975-11-17 1980-01-30 Post Office Tlephone conference amplifier
CA1064632A (fr) * 1975-12-17 1979-10-16 Post Office (The) Circuit de commutation
US4086432A (en) * 1975-12-17 1978-04-25 The Post Office Switching circuit useful in telephone conference systems
US4482998A (en) * 1982-05-27 1984-11-13 At&T Bell Laboratories Method and apparatus for improving the quality of communication in a digital conference arrangement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3511931A (en) * 1966-02-02 1970-05-12 Sylvania Electric Prod Conferencing networks employing virtual ground summation to obtain isolation
US3524929A (en) * 1967-06-29 1970-08-18 Automatic Elect Lab Telephone conference circuit
US3579138A (en) * 1969-08-25 1971-05-18 American Optical Corp Automatic gain presetting circuit

Also Published As

Publication number Publication date
GB1395495A (en) 1975-05-29
US3816917A (en) 1974-06-18
NL171217C (nl) 1983-02-16
CA965890A (en) 1975-04-08
NL7209243A (fr) 1973-01-03
BE785738A (fr) 1972-10-16
NL171217B (nl) 1982-09-16

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Legal Events

Date Code Title Description
ST Notification of lapse