GB625294A - Improvements in or relating to carrier current transmission systems - Google Patents

Improvements in or relating to carrier current transmission systems

Info

Publication number
GB625294A
GB625294A GB35465/46A GB3546546A GB625294A GB 625294 A GB625294 A GB 625294A GB 35465/46 A GB35465/46 A GB 35465/46A GB 3546546 A GB3546546 A GB 3546546A GB 625294 A GB625294 A GB 625294A
Authority
GB
United Kingdom
Prior art keywords
wide
channel
band
switches
carriers
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
GB35465/46A
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
Priority to ES0179920A priority Critical patent/ES179920A1/en
Publication of GB625294A publication Critical patent/GB625294A/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

Landscapes

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

Abstract

625,294. Carrier transmission. STANDARD TELEPHONES & CABLES, Ltd., THORNTON, A. M., PRIOR, H. T., and GOULLEE, S. J. Nov. 29, 1946, No. 35465. [Class 40 (iv)] In a multi-channel system, two or more telephone channels may be replaced by a wide-band channel for the transmission of music &c. by the operation of switches controlling the carrier supply to the channel equipment. As shown for a 12-channel system, with the switches 24, 25, 29 in the lower position, the carriers are fed from the source 19 to the telephone channel equipment 1. Whereas with the switches in the upper position, the carriers F and I are transferred to wide-band channel equipments 2, 3, and the carriers of the other replaced channels D, E and G, H are suppressed. The switches may be arranged so that only one wide-band channel may be brought into service. The wide-band equipments are coupled to the line 17, 18 through hybrid coils 56, 58-60, Fig. 5, and may comprise separate modulating and demodulating apparatus, Fig. 3 (not shown), or reversible apparatus, Fig. 4 (not shown). Compander apparatus may be employed to reduce interference between two wide-band channels.
GB35465/46A 1946-11-29 1946-11-29 Improvements in or relating to carrier current transmission systems Expired GB625294A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ES0179920A ES179920A1 (en) 1946-11-29 1947-09-27 IMPROVEMENTS IN POTATING CURRENT TRANSMISSION SYSTEMS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB272425X 1946-11-29

Publications (1)

Publication Number Publication Date
GB625294A true GB625294A (en) 1949-06-24

Family

ID=10256410

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35465/46A Expired GB625294A (en) 1946-11-29 1946-11-29 Improvements in or relating to carrier current transmission systems

Country Status (3)

Country Link
CH (1) CH272425A (en)
FR (1) FR957230A (en)
GB (1) GB625294A (en)

Also Published As

Publication number Publication date
CH272425A (en) 1950-12-15
FR957230A (en) 1950-02-17

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