GB476925A - Improvements in four-wire systems for carrier wave telephony - Google Patents

Improvements in four-wire systems for carrier wave telephony

Info

Publication number
GB476925A
GB476925A GB22101/37A GB2210137A GB476925A GB 476925 A GB476925 A GB 476925A GB 22101/37 A GB22101/37 A GB 22101/37A GB 2210137 A GB2210137 A GB 2210137A GB 476925 A GB476925 A GB 476925A
Authority
GB
United Kingdom
Prior art keywords
lines
over
branches
modulating
demodulating
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
GB22101/37A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB476925A publication Critical patent/GB476925A/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
    • H04J1/16—Monitoring arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/08—Arrangements for combining channels
    • 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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

476,925. Multiplex systems. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Aug. 11, 1937, No. 22101. Convention date, Aug. 14, 1936. [Class 40 (iv)] In a four-wire carrier multiplex system using different frequency bands for the two directions of transmission, each channel (two bands) is transmitted over a separate two-wire line between a four-wire terminal and the modulating and demodulating equipment. This arrangement is suitable for use where the terminal station is some distance from the actual cable terminal and avoids the loss of a number of channels in case of an unserviceable line between the cable terminal and the station. As shown, east-bound bands of the channels over L2 are separated by filters O11-O31 and transmitted over lines VI-V3 to demodulating branches DM1-DM3 leading to low - frequency lines T1-T3. West - bound transmissions from these lines pass over modulating branches M1-M3 to the lines V1-V3 and are sent to line L1 over filters Z11-Z21. Separating and low-pass filters are provided in the modulating and demodulating branches.
GB22101/37A 1936-08-14 1937-08-11 Improvements in four-wire systems for carrier wave telephony Expired GB476925A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE825508X 1936-08-14
DE2181457X 1936-08-14
DE476925X 1936-08-14

Publications (1)

Publication Number Publication Date
GB476925A true GB476925A (en) 1937-12-17

Family

ID=34841325

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22101/37A Expired GB476925A (en) 1936-08-14 1937-08-11 Improvements in four-wire systems for carrier wave telephony

Country Status (2)

Country Link
FR (1) FR825508A (en)
GB (1) GB476925A (en)

Also Published As

Publication number Publication date
FR825508A (en) 1938-03-04

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