GB714458A - Improvements relating to multi-channel communication systems - Google Patents

Improvements relating to multi-channel communication systems

Info

Publication number
GB714458A
GB714458A GB1118552A GB1118552A GB714458A GB 714458 A GB714458 A GB 714458A GB 1118552 A GB1118552 A GB 1118552A GB 1118552 A GB1118552 A GB 1118552A GB 714458 A GB714458 A GB 714458A
Authority
GB
United Kingdom
Prior art keywords
channels
communication
amplifier
modulator
terminated
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
GB1118552A
Inventor
Frank Ralph
John Albert Pim
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 Brothers and Co Ltd
Original Assignee
Siemens Brothers and Co Ltd
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 Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Priority to GB1118552A priority Critical patent/GB714458A/en
Publication of GB714458A publication Critical patent/GB714458A/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
    • H04J1/10—Intermediate station arrangements, e.g. for branching, for tapping-off

Landscapes

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

Abstract

714,458. Multiplex systems. SIEMENS BROS. & CO., Ltd. May 1, 1953 [May 2, 1952], No. 11185/52. Class 40 (4) In a multi-channel alternating current telegraph system wherein some of the channels are terminated at an intermediate station and the same frequency range is used for communication in the same direction over another part of the system, inter action is prevented by modulating all the signal currents received at the intermediate station so that the frequency bands of the terminated cha,nnels are transposed to a position outside, but adjacent to, the communication band. In one example an eighteen channel system extending over a range of frequencies 420-2460 c.p.s., six channels 420-1020 c.p.s. are received in apparatus R after amplification in amplifier A1, and the whole eighteen channels are also passed via a modulator M and a filter F to an output amplifier AZ. The modulator is fed by a 3600 c.p.s. oscillator and the lower side-bands 1140-3180 are selected by the filter. Six additional channels originating from a sender T and occupying the frequency band 420-1020 c.p.s. are also applied to the amplifier A2 for communication in the same direction.
GB1118552A 1952-05-02 1952-05-02 Improvements relating to multi-channel communication systems Expired GB714458A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1118552A GB714458A (en) 1952-05-02 1952-05-02 Improvements relating to multi-channel communication systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1118552A GB714458A (en) 1952-05-02 1952-05-02 Improvements relating to multi-channel communication systems

Publications (1)

Publication Number Publication Date
GB714458A true GB714458A (en) 1954-08-25

Family

ID=9981579

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1118552A Expired GB714458A (en) 1952-05-02 1952-05-02 Improvements relating to multi-channel communication systems

Country Status (1)

Country Link
GB (1) GB714458A (en)

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