BE785738A - Circuit de transmission a frequence vocale - Google Patents

Circuit de transmission a frequence vocale

Info

Publication number
BE785738A
BE785738A BE785738A BE785738A BE785738A BE 785738 A BE785738 A BE 785738A BE 785738 A BE785738 A BE 785738A BE 785738 A BE785738 A BE 785738A BE 785738 A BE785738 A BE 785738A
Authority
BE
Belgium
Prior art keywords
transmission circuit
frequency transmission
voice frequency
voice
circuit
Prior art date
Application number
BE785738A
Other languages
English (en)
French (fr)
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
Publication of BE785738A publication Critical patent/BE785738A/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)
BE785738A 1971-06-30 1972-06-30 Circuit de transmission a frequence vocale BE785738A (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
BE785738A true BE785738A (fr) 1972-10-16

Family

ID=10311631

Family Applications (1)

Application Number Title Priority Date Filing Date
BE785738A BE785738A (fr) 1971-06-30 1972-06-30 Circuit de transmission a frequence vocale

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
NL7209243A (en:Method) 1973-01-03
FR2144413A5 (en:Method) 1973-02-09
NL171217B (nl) 1982-09-16
US3816917A (en) 1974-06-18
CA965890A (en) 1975-04-08

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: THE POST OFFICE

Effective date: 19840630