GB2139055B - Automatic nulling teleconferencing circuit - Google Patents

Automatic nulling teleconferencing circuit

Info

Publication number
GB2139055B
GB2139055B GB08411028A GB8411028A GB2139055B GB 2139055 B GB2139055 B GB 2139055B GB 08411028 A GB08411028 A GB 08411028A GB 8411028 A GB8411028 A GB 8411028A GB 2139055 B GB2139055 B GB 2139055B
Authority
GB
United Kingdom
Prior art keywords
teleconferencing
circuit
automatic nulling
nulling
automatic
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
GB08411028A
Other versions
GB8411028D0 (en
GB2139055A (en
Inventor
Randall D Godsey
Michael J Rose
Daryl P Braun
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.)
Darome Inc
Original Assignee
Darome 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 Darome Inc filed Critical Darome Inc
Publication of GB8411028D0 publication Critical patent/GB8411028D0/en
Publication of GB2139055A publication Critical patent/GB2139055A/en
Application granted granted Critical
Publication of GB2139055B publication Critical patent/GB2139055B/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/581—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using a transformer
    • H04B1/582—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using a transformer with automatic balancing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/002—Applications of echo suppressors or cancellers in telephonic connections

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
GB08411028A 1983-04-28 1984-04-30 Automatic nulling teleconferencing circuit Expired GB2139055B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US48945383A 1983-04-28 1983-04-28

Publications (3)

Publication Number Publication Date
GB8411028D0 GB8411028D0 (en) 1984-06-06
GB2139055A GB2139055A (en) 1984-10-31
GB2139055B true GB2139055B (en) 1986-10-01

Family

ID=23943926

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08411028A Expired GB2139055B (en) 1983-04-28 1984-04-30 Automatic nulling teleconferencing circuit

Country Status (1)

Country Link
GB (1) GB2139055B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3409877A1 (en) * 1984-03-17 1985-09-19 Neumann Elektronik GmbH, 4330 Mülheim DEVICE FOR THE OPTIMAL ADAPTATION OF A FORK GEARBOX TO A TELECOMMUNICATION LINE
DE3409879A1 (en) * 1984-03-17 1985-09-19 Neumann Elektronik GmbH, 4330 Mülheim METHOD FOR ADAPTING A FORK CIRCUIT TO A TELECOMMUNICATION LINE, AND APPLICATION OF THE METHOD AND DEVICE FOR IMPLEMENTING THE METHOD
DE3440591A1 (en) * 1984-11-07 1986-05-22 Neumann Elektronik GmbH, 4330 Mülheim DEVICE FOR THE OPTIMAL ADAPTATION OF A FORK GEARBOX TO A TELECOMMUNICATION LINE
FR2576728B1 (en) * 1985-01-25 1988-02-12 Thebault Jack CIRCUIT FOR SEARCHING FOR BALANCING A TRANSMISSION LINE
DE3507661A1 (en) * 1985-03-05 1986-09-18 Neumann Elektronik GmbH, 4330 Mülheim METHOD FOR ADAPTING A FORK AMPLIFIER CIRCUIT TO A TELECOMMUNICATION LINE AND DEVICE FOR IMPLEMENTING THE METHOD
DE3522238A1 (en) * 1985-06-21 1987-01-02 Neumann Elektronik Gmbh DEVICE FOR ADAPTING A BIDIRECTIONAL AMPLIFIER CIRCUIT ARRANGED IN A TELECOMMUNICATION LINE TO THE TELECOMMUNICATION LINE
DE3535411A1 (en) * 1985-10-04 1987-04-09 Neumann Elektronik Gmbh DEVICE AND METHOD FOR CARRYING OUT TELEPHONE CALLS BETWEEN THREE AND MORE PARTICIPANTS
ES2059221B1 (en) * 1991-04-18 1995-05-01 Aplicaciones Electronicas Quas MULTI-CONFERENCE SYSTEM.
BE1007715A3 (en) * 1993-11-09 1995-10-03 Philips Electronics Nv Telecommunication system, base station for wireless communication and endstation for wire-bound telecommunication
GB9409899D0 (en) * 1994-05-18 1994-07-06 Fortier John D Electronic hybrid circuit
EP1148683A3 (en) * 2000-03-01 2004-05-06 Virata Corporation Adaptive hybrid for multi-carrier communication

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR850637A (en) * 1938-02-22 1939-12-21 Telefunken Gmbh Improvements to balanced assemblies of passage from a two-wire system to a tetrafilar system
US3982080A (en) * 1975-01-16 1976-09-21 Bell Telephone Laboratories, Incorporated Automatic cable balancing network
GB2130851A (en) * 1982-11-24 1984-06-06 Grundy & Partners Ltd Hybrid junction circuits

Also Published As

Publication number Publication date
GB8411028D0 (en) 1984-06-06
GB2139055A (en) 1984-10-31

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee