GB274088A - Improvements in or relating to telephone lines with amplifiers - Google Patents

Improvements in or relating to telephone lines with amplifiers

Info

Publication number
GB274088A
GB274088A GB17964/27A GB1796427A GB274088A GB 274088 A GB274088 A GB 274088A GB 17964/27 A GB17964/27 A GB 17964/27A GB 1796427 A GB1796427 A GB 1796427A GB 274088 A GB274088 A GB 274088A
Authority
GB
United Kingdom
Prior art keywords
attenuation
maximum frequency
amplifiers
curve
building
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
GB17964/27A
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens 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 Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Publication of GB274088A publication Critical patent/GB274088A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

274,088. Siemens & Halshe Akt.-Ges. July 7, 1926, [Convention date]. Repeating and amplifying systems.-In a long transmission line, the maximum frequency to be transmitted is limited by the admissible building up period of the current, which is a rapidly increasing function of the frequency, and according to the invention the amplifiers are so adjusted that this maximum frequency is equal to the maximum frequency imposed by the limiting attenuation value. Fig. 2a shows the attenuation curve a of an amplifier section and the amplifying curve /3 of the corresponding amplifier, which give rise to the residual attenuation curve of Fig. 2b. The maximum frequency is therefore fixed bv the limiting attenuation value b‹. A line comprising n sections has n-1 amplifiers, so that the residual attenuation of the whole line differs from the attenuation of one section by an amount substantially proportional to the building up period.
GB17964/27A 1926-07-07 1927-07-06 Improvements in or relating to telephone lines with amplifiers Expired GB274088A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE274088X 1926-07-07

Publications (1)

Publication Number Publication Date
GB274088A true GB274088A (en) 1928-10-08

Family

ID=6018649

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17964/27A Expired GB274088A (en) 1926-07-07 1927-07-06 Improvements in or relating to telephone lines with amplifiers

Country Status (2)

Country Link
FR (1) FR636722A (en)
GB (1) GB274088A (en)

Also Published As

Publication number Publication date
FR636722A (en) 1928-04-16

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