GB525462A - Improvements in or relating to two-way telephone and telegraph circuits - Google Patents

Improvements in or relating to two-way telephone and telegraph circuits

Info

Publication number
GB525462A
GB525462A GB5816/39A GB581639A GB525462A GB 525462 A GB525462 A GB 525462A GB 5816/39 A GB5816/39 A GB 5816/39A GB 581639 A GB581639 A GB 581639A GB 525462 A GB525462 A GB 525462A
Authority
GB
United Kingdom
Prior art keywords
way
network
arrangement
circuit
feb
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
GB5816/39A
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.)
Telefunken AG
Original Assignee
Telefunken AG
Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH
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 Telefunken AG, Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH filed Critical Telefunken AG
Publication of GB525462A publication Critical patent/GB525462A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

525,462. Two-way transmission. TELEFUNKEN GES. FUR DRAHTLOSE TELEGRAPHIE. Feb. 21, 1939, No. 5816. Convention date, Feb. 22, 1938. [Class 40 (iv)] In a circuit involving a balancing network at the junction between a two-way and two one way lines, means are provided for measur ing the want of balance and for adjusting the network automatically or otherwise while the circuit is in use. The test currents which are applied to the receiving branch are picked up in the sending branch and measured or used to control the impedance of a valve acting as an element of the network or to control a regulating resistance by means of a motor or step-by-step switch. In the arrangement using a valve impedance the test current is applied continuously and is outside the range of the communication frequencies. The Figure shows an arrangement in which test currents from Up are prevented by the use of tapped transformers T1, T2, T3, T4 from reaching the two-way line. The degree of unbalance is represented by the difference between the test current voltages developed across resistances R1, R2. These may be filtered out, rectified separately and applied jointly to an indicating or controlling circuit. The regulators or rectifiers are preferably slow-acting. A known arrangement is referred to in which the balancing network is automatically adjusted on the occurrence of a disturbance of long duration.
GB5816/39A 1938-02-22 1939-02-21 Improvements in or relating to two-way telephone and telegraph circuits Expired GB525462A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE525462X 1938-02-22

Publications (1)

Publication Number Publication Date
GB525462A true GB525462A (en) 1940-08-28

Family

ID=6552620

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5816/39A Expired GB525462A (en) 1938-02-22 1939-02-21 Improvements in or relating to two-way telephone and telegraph circuits

Country Status (2)

Country Link
FR (1) FR850637A (en)
GB (1) GB525462A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059060A (en) * 1956-12-14 1962-10-16 Int Standard Electric Corp Electric signalling circuits
GB2139055A (en) * 1983-04-28 1984-10-31 Darome Inc Automatic nulling teleconferencing circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781684A (en) * 1970-03-24 1973-12-25 Us Army Single-antenna repeater system utilizing hybrid transformers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059060A (en) * 1956-12-14 1962-10-16 Int Standard Electric Corp Electric signalling circuits
GB2139055A (en) * 1983-04-28 1984-10-31 Darome Inc Automatic nulling teleconferencing circuit

Also Published As

Publication number Publication date
FR850637A (en) 1939-12-21

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