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GB558311A - Electric wave transmission system - Google Patents

Electric wave transmission system

Info

Publication number
GB558311A
GB558311A GB13168/42A GB1316842A GB558311A GB 558311 A GB558311 A GB 558311A GB 13168/42 A GB13168/42 A GB 13168/42A GB 1316842 A GB1316842 A GB 1316842A GB 558311 A GB558311 A GB 558311A
Authority
GB
United Kingdom
Prior art keywords
cable
series
current
thermistor
furnish
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
GB13168/42A
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 GB558311A publication Critical patent/GB558311A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Optical Communication System (AREA)
  • Amplifiers (AREA)

Abstract

558,311. Repeater systems. STANDARD TELEPHONES & CABLES Ltd. Sept. 18, 1942, No. 13168. Convention date, Oct. 31, 1941. [Class 40 (iv)] [Also in Group XL] In a system in which power current is fed to repeaters in a submarine cable over the cable conductors, the gain of the amplifiers is adjusted by varying the power current. As shown, a very low frequency generator 12, which may furnish a square wave, or a periodically varying resistance is provided in series with the direct current source 11 to furnish an A.C. component the effect of which diminishes in the remote parts of the cable. In the amplifier shown, the anode/cathode voltage is derived from the potential drop in all the heaters in series. The gain is controlled by an indirectly heated thermistor T1 in the #-path. The heater 27 of the thermistor derives current from a resistance 28 in the supply circuit, the effect of changes in the supply current being exaggerated by a directly heated thermistor T2 in series with the coil 27. By providing thermistors of various kinds in different amplifiers, various degrees of control can be exercised at different parts of the cable. Specification 557,028 is referred to.
GB13168/42A 1941-10-31 1942-09-18 Electric wave transmission system Expired GB558311A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US417331A US2350951A (en) 1941-10-31 1941-10-31 Electric wave system

Publications (1)

Publication Number Publication Date
GB558311A true GB558311A (en) 1943-12-30

Family

ID=23653519

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13168/42A Expired GB558311A (en) 1941-10-31 1942-09-18 Electric wave transmission system

Country Status (2)

Country Link
US (1) US2350951A (en)
GB (1) GB558311A (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428363A (en) * 1944-07-26 1947-10-07 Bell Telephone Labor Inc Negative feed-back amplifier
BE476372A (en) * 1946-04-30
BE495507A (en) * 1949-05-05
US2838742A (en) * 1951-12-29 1958-06-10 Pan American Petroleum Corp Seismic gain control
US2997668A (en) * 1952-01-29 1961-08-22 Alfred W Nolle Method and apparatus for controlling the relative gains of a plurality of amplifiers
US3121774A (en) * 1959-12-31 1964-02-18 British Telecomm Res Ltd Gain regulating arrangement for carrier current telecommunication system
BE662030A (en) * 1964-05-04 1965-10-05
US3387232A (en) * 1965-08-03 1968-06-04 Bell Telephone Labor Inc Pilot-controlled regulating apparatus for transmission systems
US5206902A (en) * 1991-04-01 1993-04-27 At&T Bell Laboratories Network signaling arrangement for controlling tandem network functions
US5471527A (en) * 1993-12-02 1995-11-28 Dsc Communications Corporation Voice enhancement system and method
US5802164A (en) * 1995-12-22 1998-09-01 At&T Corp Systems and methods for controlling telephone sound enhancement on a per call basis

Also Published As

Publication number Publication date
US2350951A (en) 1944-06-06

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