GB711825A - Improvements in or relating to arrangements for crosstalk reduction in electric double side-band carrier communication systems - Google Patents

Improvements in or relating to arrangements for crosstalk reduction in electric double side-band carrier communication systems

Info

Publication number
GB711825A
GB711825A GB473152A GB473152A GB711825A GB 711825 A GB711825 A GB 711825A GB 473152 A GB473152 A GB 473152A GB 473152 A GB473152 A GB 473152A GB 711825 A GB711825 A GB 711825A
Authority
GB
United Kingdom
Prior art keywords
phase
circuits
carrier
adjustment
over
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
GB473152A
Inventor
Bent Bulow Jacobsen
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 to BE517873D priority Critical patent/BE517873A/xx
Priority to NL89662D priority patent/NL89662C/xx
Priority to NLAANVRAGE7608411,B priority patent/NL176087B/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB473152A priority patent/GB711825A/en
Priority to FR1076989D priority patent/FR1076989A/en
Priority to CH329214D priority patent/CH329214A/en
Priority to DEI6948A priority patent/DE940410C/en
Publication of GB711825A publication Critical patent/GB711825A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/12—Arrangements for reducing cross-talk between channels
    • 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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

711,825. Preventing inductive disturbance. STANDARD TELEPHONES & CABLES, Ltd. Feb. 13, 1953 [Feb. 22, 1952], No. 4731/52. Class 40 (4) In a communication system wherein a frequency multiplex system transmitting a carrier frequency and two sidebands in respect of each channel is operated over each of a number of adjacent communication circuits, and the same series of carrier frequencies is employed over each, means are provided for adjusting the phases of the carrier waves transmitted over the respective circuits so that at least one of the stations of the system (terminal or repeater) the phases of the carrier waves on the respective circuits are substantially the same. This adjustment ensures that sidebands induced in adjacent circuits are substantially 90 degrees out of phase with the carrier frequency on that line and cross-talk is in consequence a minimum. Phase shifters 13-15, 28-30, 43-45, Fig. 1, provide adjustment of the phase of the currents supplied by oscillators 1-3 to modulators 7-9, 22-24, 37-39. They may be set to produce carriers of similar phase at the transmission terminals, or the phase measuring device described with reference to Fig. 3 (not shown) may be used at any point along the transmission path to arrange for adjustment of the phase shifters at the terminal stations to produce phase equality at that point. Circuit 2 is terminated at a branch station 97, Fig. 4, some distance from the main route and the carriers are used to synchronize the oscillators 105-107 of a transmitter 99 working to the right-hand terminal. Phase shifters 108-110 are provided to give identity of carrier phase at the outputs of main line repeaters 94, 95. Equalization of the velocities of propagation over the various circuits by means of adjustable delay networks as a preliminary to. phase adjustment is also described and a suitable delay network is described with reference to Fig. 6 (not shown).
GB473152A 1952-02-22 1952-02-22 Improvements in or relating to arrangements for crosstalk reduction in electric double side-band carrier communication systems Expired GB711825A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE517873D BE517873A (en) 1952-02-22
NL89662D NL89662C (en) 1952-02-22
NLAANVRAGE7608411,B NL176087B (en) 1952-02-22 PROCESS FOR THE PREPARATION OF 16-RING MACROLIDES AND FOR THE PREPARATION OF A MEDICINAL PRODUCT.
GB473152A GB711825A (en) 1952-02-22 1952-02-22 Improvements in or relating to arrangements for crosstalk reduction in electric double side-band carrier communication systems
FR1076989D FR1076989A (en) 1952-02-22 1953-02-19 Powerline communication systems
CH329214D CH329214A (en) 1952-02-22 1953-02-21 Powerline communication installation
DEI6948A DE940410C (en) 1952-02-22 1953-02-22 Circuit arrangement for reducing far-end crosstalk in multi-channel carrier frequency double-sideband systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB473152A GB711825A (en) 1952-02-22 1952-02-22 Improvements in or relating to arrangements for crosstalk reduction in electric double side-band carrier communication systems

Publications (1)

Publication Number Publication Date
GB711825A true GB711825A (en) 1954-07-14

Family

ID=9782726

Family Applications (1)

Application Number Title Priority Date Filing Date
GB473152A Expired GB711825A (en) 1952-02-22 1952-02-22 Improvements in or relating to arrangements for crosstalk reduction in electric double side-band carrier communication systems

Country Status (6)

Country Link
BE (1) BE517873A (en)
CH (1) CH329214A (en)
DE (1) DE940410C (en)
FR (1) FR1076989A (en)
GB (1) GB711825A (en)
NL (2) NL89662C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1042032B (en) * 1954-10-22 1958-10-30 Int Standard Electric Corp Circuit arrangement for reducing long-distance crosstalk in carrier frequency systems, in particular double sideband systems with carrier transmission

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1042032B (en) * 1954-10-22 1958-10-30 Int Standard Electric Corp Circuit arrangement for reducing long-distance crosstalk in carrier frequency systems, in particular double sideband systems with carrier transmission

Also Published As

Publication number Publication date
NL176087B (en)
NL89662C (en)
DE940410C (en) 1956-03-15
FR1076989A (en) 1954-11-03
BE517873A (en)
CH329214A (en) 1958-04-15

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