GB539948A - Improvements in or relating to carrier wave signalling systems - Google Patents

Improvements in or relating to carrier wave signalling systems

Info

Publication number
GB539948A
GB539948A GB5686/40A GB568640A GB539948A GB 539948 A GB539948 A GB 539948A GB 5686/40 A GB5686/40 A GB 5686/40A GB 568640 A GB568640 A GB 568640A GB 539948 A GB539948 A GB 539948A
Authority
GB
United Kingdom
Prior art keywords
broadcast channel
bands
gap
telephone
same
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
GB5686/40A
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB539948A publication Critical patent/GB539948A/en
Priority to ES0177219A priority Critical patent/ES177219A1/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
    • H04J1/04—Frequency-transposition arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/18—Frequency-division multiplex systems in which all the carriers are amplitude-modulated

Landscapes

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

Abstract

539,948. Multiplex transmission. STANDARD TELEPHONES & CABLES, Ltd., FAIRLEY, F., and WALSH, R. March 29, 1940, No. 5686. Drawings to Specification. [Class 40 (iv)] In a system in which the frequency bands allotted to a number of telephone channels for transmission in the two directions form two groups in the spectrum with a gap between them, the gap is made wide enough to accommodate a broadcast channel comprising two frequency bands each of which transmits in the same direction as the adjacent group of telephone bands. The two bands may be transmitted on the same or different carriers, and may overlap to a limited extent. The broadcast channel may be carried by the same line as the telephone channels or by a parallel line, but in either case it is separated therefrom at repeater stations. The repeaters for the broadcast channel may comprise a single amplifier with directional switching or separate amplifiers for the two directions with a band-suppressor circuit switched from one path to the other to prevent singing. Specification 426,664, [Group XL], is referred to.
GB5686/40A 1940-03-29 1940-03-29 Improvements in or relating to carrier wave signalling systems Expired GB539948A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ES0177219A ES177219A1 (en) 1940-03-29 1947-03-13 IMPROVEMENTS IN OR RELATED TO CARRIER WAVE SIGNALING SYSTEMS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB277158X 1940-03-29

Publications (1)

Publication Number Publication Date
GB539948A true GB539948A (en) 1941-09-30

Family

ID=10264121

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5686/40A Expired GB539948A (en) 1940-03-29 1940-03-29 Improvements in or relating to carrier wave signalling systems

Country Status (4)

Country Link
BE (1) BE474321A (en)
CH (1) CH277158A (en)
FR (1) FR960562A (en)
GB (1) GB539948A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2718232C3 (en) * 1977-04-23 1981-03-19 TE KA DE Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg Carrier frequency system in two-wire separation

Also Published As

Publication number Publication date
BE474321A (en)
CH277158A (en) 1951-08-15
FR960562A (en) 1950-04-20

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