GB207834A - Improvements in and relating to a method of balancing telephone phantom lines for reducing overhearing - Google Patents

Improvements in and relating to a method of balancing telephone phantom lines for reducing overhearing

Info

Publication number
GB207834A
GB207834A GB30519/23A GB3051923A GB207834A GB 207834 A GB207834 A GB 207834A GB 30519/23 A GB30519/23 A GB 30519/23A GB 3051923 A GB3051923 A GB 3051923A GB 207834 A GB207834 A GB 207834A
Authority
GB
United Kingdom
Prior art keywords
impedances
adjustable
talk
phantom
wires
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
GB30519/23A
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.)
Felten and Guilleaume Carlswerk AG
Original Assignee
Felten and Guilleaume Carlswerk AG
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 Felten and Guilleaume Carlswerk AG filed Critical Felten and Guilleaume Carlswerk AG
Publication of GB207834A publication Critical patent/GB207834A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/32—Reducing cross-talk, e.g. by compensating

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

207,834. Felten &. Guilleaume Carlswerk Akt.-Ges. Dec. 4, 1922, [Convention date]. Drawings to Specification. Phantom-circuit systems; induction, preventing and minimizing.-In a phantom circuit system, want of balance, giving rise to cross-talk, is corrected by the insertion of compensating impedances, such as chain conductors, or adjustable resistances in series with a variometer, the latter having one coil in each line of a pair, between the instruments and the ends of the wires. The elements forming the chain conductor are so chosen that the effective resistance and reactance of this conductor depend upon frequency according to a law which imitates that followed by empirical adjustable impedances, chosen so as to eliminate cross-talk at various fixed frequencies. The Specification refers to known methods in which adjustable impedances comprising resistances shunted by capacities are connected between the ends of the wires and earth, and subsequently replaced by a series of resonant circuits corresponding to outstanding values of the original impedances.
GB30519/23A 1922-12-04 1923-12-04 Improvements in and relating to a method of balancing telephone phantom lines for reducing overhearing Expired GB207834A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE207834X 1922-12-04

Publications (1)

Publication Number Publication Date
GB207834A true GB207834A (en) 1924-04-17

Family

ID=5793914

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30519/23A Expired GB207834A (en) 1922-12-04 1923-12-04 Improvements in and relating to a method of balancing telephone phantom lines for reducing overhearing

Country Status (1)

Country Link
GB (1) GB207834A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493948A (en) * 1983-06-27 1985-01-15 The Inteleplex Corporation Transparent secondary information transmission system for an information transmission system
US4528422A (en) * 1983-06-27 1985-07-09 The Inteleplex Corporation Transparent secondary information transmission system for an information transmission system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493948A (en) * 1983-06-27 1985-01-15 The Inteleplex Corporation Transparent secondary information transmission system for an information transmission system
US4528422A (en) * 1983-06-27 1985-07-09 The Inteleplex Corporation Transparent secondary information transmission system for an information transmission system

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