NL7209243A - - Google Patents

Info

Publication number
NL7209243A
NL7209243A NL7209243A NL7209243A NL7209243A NL 7209243 A NL7209243 A NL 7209243A NL 7209243 A NL7209243 A NL 7209243A NL 7209243 A NL7209243 A NL 7209243A NL 7209243 A NL7209243 A NL 7209243A
Authority
NL
Netherlands
Application number
NL7209243A
Other versions
NL171217C (nl
NL171217B (nl
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 filed Critical
Publication of NL7209243A publication Critical patent/NL7209243A/xx
Publication of NL171217B publication Critical patent/NL171217B/xx
Application granted granted Critical
Publication of NL171217C publication Critical patent/NL171217C/xx

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)
NLAANVRAGE7209243,A 1971-06-30 1972-06-30 Telefoon - conferentie-versterkerschakeling. NL171217C (nl)

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
NL7209243A true NL7209243A (en:Method) 1973-01-03
NL171217B NL171217B (nl) 1982-09-16
NL171217C NL171217C (nl) 1983-02-16

Family

ID=10311631

Family Applications (1)

Application Number Title Priority Date Filing Date
NLAANVRAGE7209243,A NL171217C (nl) 1971-06-30 1972-06-30 Telefoon - conferentie-versterkerschakeling.

Country Status (6)

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

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 (en) * 1975-12-17 1979-10-16 Post Office (The) Switching circuit
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
NL171217C (nl) 1983-02-16
FR2144413A5 (en:Method) 1973-02-09
NL171217B (nl) 1982-09-16
US3816917A (en) 1974-06-18
BE785738A (fr) 1972-10-16
CA965890A (en) 1975-04-08

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Legal Events

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Free format text: CORR. TO A PAMPHLET OF A PAT.APPLICATION PUBLISHED

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