US1647985A - Artificial line - Google Patents

Artificial line Download PDF

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Publication number
US1647985A
US1647985A US71739A US7173925A US1647985A US 1647985 A US1647985 A US 1647985A US 71739 A US71739 A US 71739A US 7173925 A US7173925 A US 7173925A US 1647985 A US1647985 A US 1647985A
Authority
US
United States
Prior art keywords
line
impedance
frequency
artificial
loaded
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 - Lifetime
Application number
US71739A
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English (en)
Inventor
Deutschmann Walter
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 Corp
Original Assignee
Siemens Corp
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 Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US1647985A publication Critical patent/US1647985A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/40—Artificial lines; Networks simulating a line of certain length

Definitions

  • This yinvention relates to artificial lines for balancing loaded telephone lines.
  • the invention aims to create a good ⁇ simulation of loaded lines in a simple Way, up to frequencies of about 0.8 to 0.9 of thecutolf frequency of the loaded line.
  • the balancing impedance consists of a network constructed so asto conform to a line section, its cutoff frequency is higher than that of the line to be simulated with equal or approximately equal iterative impedance and closed by means of an ohmic resistance.
  • Fig. 1 shows the frequency-impedance characteristics of a loaded line and a balancing :net-work having the same cut-off frequency
  • Fig. 2 shows the frequency-impedance characteristics of a loaded line and a network designed according to this invention
  • the invention is based on the consideration roduct LC in the simulating section, the requency at which the impedance of the balancing network is a maximum increases, and a more -eXact simulation of the line impedance in the important frequency range may be obtained.
  • Fig. 2 shows the improved balance obtained by use of a mesh according to Fig. 3, in which the product LC is equal to 0.7 of this product in the case of the line to be simulated, or expressed in another way, whose cutoffv frequency is 1.2 times as great as the cut-off f frequency of the line.
  • the dotted line represents the impedance characteristic of the line to be simulated
  • the continuous line represents the impedance characteristic of the simulating network.
  • Fig. 3 illustrates the connection of the simulating network.
  • An artificial line for simulating the impedance of a long loaded line comprising a section having shunt capacity and series inductance so proportioned that said section has an iterative impedance substantially equal to that of the loaded line and a cut-off 1925 frequency substantially higher than that of the line, and a terminating resistance sub# stantially equal to the iterative impedance of the section.
  • An artificial net work for simulating the impedance of a long loaded line having an iterative impedance Z and a cut-off frequency f comprising a 1r type section l ⁇ g a series inductance L and shunt cond users each of capacity 2C of such value that the is substantially equal to Z and that 1T-C is substantially equal to 1.2i, and a resistance havin a value substantially equal to Z connectec in shunt to one of said condensers.

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  • 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)
  • Coils Or Transformers For Communication (AREA)
US71739A 1924-05-22 1925-11-27 Artificial line Expired - Lifetime US1647985A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES66116D DE486775C (de) 1924-05-22 1924-05-22 Nachbildung des Scheinwiderstandes von Pupinleitungen

Publications (1)

Publication Number Publication Date
US1647985A true US1647985A (en) 1927-11-08

Family

ID=27770805

Family Applications (1)

Application Number Title Priority Date Filing Date
US71739A Expired - Lifetime US1647985A (en) 1924-05-22 1925-11-27 Artificial line

Country Status (4)

Country Link
US (1) US1647985A (de)
AT (1) AT104309B (de)
DE (1) DE486775C (de)
GB (1) GB234463A (de)

Also Published As

Publication number Publication date
DE486775C (de) 1929-12-04
GB234463A (en) 1926-07-22
AT104309B (de) 1926-10-11

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