US1638536A - Distortion compensator - Google Patents

Distortion compensator Download PDF

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Publication number
US1638536A
US1638536A US689972A US68997224A US1638536A US 1638536 A US1638536 A US 1638536A US 689972 A US689972 A US 689972A US 68997224 A US68997224 A US 68997224A US 1638536 A US1638536 A US 1638536A
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US
United States
Prior art keywords
frequency
line
loaded
network
distortion
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
US689972A
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English (en)
Inventor
Kupfmuller Karl
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 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
Priority claimed from DES63992D external-priority patent/DE452286C/de
Application filed by Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US1638536A publication Critical patent/US1638536A/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
    • H04B3/04—Control of transmission; Equalising
    • H04B3/14—Control of transmission; Equalising characterised by the equalising network used
    • H04B3/146—Control of transmission; Equalising characterised by the equalising network used using phase-frequency equalisers
    • H04B3/147—Control of transmission; Equalising characterised by the equalising network used using phase-frequency equalisers fixed equalisers

Definitions

  • L and C are the inductance and the capacity of the coil sections.
  • L In order to counteract the detrimental transient effects which occur when handling telephone service over very long distances, it is necessary to keep the cut-off frequency higher than is otherwise used, for instance by reducing the .inductance of the coil, L This involves, however, an increase in attenuation and thus an uneconomical utilization of the circuits.
  • the object of the present invention is a balancing method for correcting the". distortion of the speech'currents caused by transient 0 phenomena.
  • the application of this method thus rendersit possible to' carry on a converation successfully over any distance by lines loaded in the known manner from .economical points of view.
  • Figs. 1 to 3, 6 and? are curves used in explaining the invention.
  • Fig. 4 shows a speech transmission system designed in accordance with the invention.
  • Fig. 5 represents a section of the network used in Fig. 4. In order to explain the improved process, it is necessary to consider first of all the cause of this distortion. It is known that alternating currents, along smooth lines, are transmitted undistorted particularly higher frequencies.
  • Said means may be inserted in the line at one or several points, "for instance at the repeater stations.
  • the'sa'me figure a broken curvee. g. indicates those values up to which the angle differences A are supplemented according to thislinvention so thatthe total phase angle increases in the ratio of frequency.
  • Fig. 4. shows a part of the speech transmission system across a long loaded line according to the system of the invention.
  • the device .13 represents thead'ditionakset to be connected with the line according to this invention.
  • This device is to be considered as a recurrentnetthe property that it work ofiltwo sections, the single sections of which are'shown in Fig. 5.
  • the sections of said recurrent network are of the s'o-called lattice type.
  • Two of the four bridge branches are provided with two equal choking coils L, while the other two contain two equal condensersC.
  • Such a network has uniformly allows all the network being as frequencies to pam and that its charsumed nonsdissi pative,
  • acteristic impedance is equal to V indo pendent of. frequency.
  • the efiect of frequency variation on the phase angle on between initial and end voltage may be represented by the function which can easily be ascertained by the well known formulae of current distribution and v Fig. 7 shows how the phase difference A of a loaded cable, 300 km. in length and of the cut-off frequency w -16500, is supplemented by inserting a 10-sections network of the above described type with'the constant
  • the characteristic impedance of the sup- If plementary network being equal to V6. it may easily be adaptedto the impedance of the loaded line. This impedance too is approximately non-inductive, as is well known,
  • the supplementary network B may be placed, either at the end of the whole transmission system or it may be distributed between the repeater stations. In general :it will be preferable to correct, in the mannermasses I described, each repeater section by-its elf, as
  • the quality of transmission is independent; of thevlength of the communication with-'- out special provisions at the end station.
  • saidv branches consisting of two equal h plement the phase angle between the initial and the end voltage in such a manner that I chokingcoils, and the other two oftwo equal condensers, said networks supplementingthe phasean'gle between the initial and the end voltage-in such a manner that said phase angle increases approximately in" the ratio of frequency,

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Transmitters (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
US689972A 1923-10-05 1924-02-01 Distortion compensator Expired - Lifetime US1638536A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DES63992D DE452286C (de) 1923-10-05 1923-10-05 Pupinleitung zur Sprachuebertragung auf grosse Entfernungen
DES64402D DE453294C (de) 1923-10-05 1923-11-27 UEbertragungssystem mit pupinisierten Leitungen zur Signaluebermittlung auf grosse Entfernungen

Publications (1)

Publication Number Publication Date
US1638536A true US1638536A (en) 1927-08-09

Family

ID=25995762

Family Applications (1)

Application Number Title Priority Date Filing Date
US689972A Expired - Lifetime US1638536A (en) 1923-10-05 1924-02-01 Distortion compensator

Country Status (6)

Country Link
US (1) US1638536A (de)
AT (1) AT102646B (de)
DE (1) DE453294C (de)
FR (1) FR581334A (de)
GB (2) GB225506A (de)
NL (1) NL19246C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2725534A (en) * 1951-03-08 1955-11-29 Mobil Oil Company Inc Recording seismic waves without phase distortion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2725534A (en) * 1951-03-08 1955-11-29 Mobil Oil Company Inc Recording seismic waves without phase distortion

Also Published As

Publication number Publication date
GB225506A (en) 1925-06-04
FR581334A (de) 1924-11-26
DE453294C (de) 1927-12-05
NL19246C (de)
GB222829A (en) 1925-06-04
AT102646B (de) 1926-02-25

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