GB203274A - A system of long distance telephony - Google Patents

A system of long distance telephony

Info

Publication number
GB203274A
GB203274A GB661423A GB661423A GB203274A GB 203274 A GB203274 A GB 203274A GB 661423 A GB661423 A GB 661423A GB 661423 A GB661423 A GB 661423A GB 203274 A GB203274 A GB 203274A
Authority
GB
United Kingdom
Prior art keywords
amplifier
long distance
receiving
distance telephony
conductor pair
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
GB661423A
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.)
DE NL THERMO TELEPHOON MIJ NV
Original Assignee
DE NL THERMO TELEPHOON MIJ NV
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 DE NL THERMO TELEPHOON MIJ NV filed Critical DE NL THERMO TELEPHOON MIJ NV
Priority to GB661423A priority Critical patent/GB203274A/en
Publication of GB203274A publication Critical patent/GB203274A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

203,274. Kilburn, B. E. D., (Naamlooze Vennootschap de Nederlandsche Thermo-Telephoon Maatschappij). March 7, 1923. Telephone systems; amplifying systems.-In a system of long-distance telephony two conductor pairs are provided from the subscriber's station to amplifiers at the exchange. Conductor pair f is used exclusively for receiving and is connected to amplifier m fed from the line i through transformers t. Conductor pair g is used for calling and for transmitting, and is connected to amplifier h. A relay o, adapted to place a shunt p across the receiving amplifier during transmission, is operated by current from the amplifier h and a rectifier n. An artificial line is connected at k.
GB661423A 1923-03-07 1923-03-07 A system of long distance telephony Expired GB203274A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB661423A GB203274A (en) 1923-03-07 1923-03-07 A system of long distance telephony

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB661423A GB203274A (en) 1923-03-07 1923-03-07 A system of long distance telephony

Publications (1)

Publication Number Publication Date
GB203274A true GB203274A (en) 1923-09-06

Family

ID=9817657

Family Applications (1)

Application Number Title Priority Date Filing Date
GB661423A Expired GB203274A (en) 1923-03-07 1923-03-07 A system of long distance telephony

Country Status (1)

Country Link
GB (1) GB203274A (en)

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