GB622787A - Carrier current transmission systems - Google Patents

Carrier current transmission systems

Info

Publication number
GB622787A
GB622787A GB9411/47A GB941147A GB622787A GB 622787 A GB622787 A GB 622787A GB 9411/47 A GB9411/47 A GB 9411/47A GB 941147 A GB941147 A GB 941147A GB 622787 A GB622787 A GB 622787A
Authority
GB
United Kingdom
Prior art keywords
repeater
paths
output
voltage
path
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
GB9411/47A
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 GB622787A publication Critical patent/GB622787A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising

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

622,787. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd. April 9, 1947, No. 9411. Convention date, June 20, 1942. [Class 40 (vi)] [Also in Group XXXIX] In a multi-channel carrier system with automatic gain control at repeater stations, two parallel paths carry the signal currents to the input of the repeater, only one of the paths including means controlled by an auxiliary current for adjusting the signal level. As shown in the Figure, these two paths may constitute feedback paths A and B for the repeater 1. Path A, which includes an attenuator and a buffer amplifier introduces a positive feedback voltage proportional to the output voltage of the repeater 1, while path B, which includes a variable mu tube 7, controlled by the pilot current derived by filter 8, amplifier 9, and rectifier 10 from the output of the repeater, in such manner that its amplification factor is inversely proportional to the pilot voltage, and attenuation and phase correctors 11, introduces a positive feedback which increases as the output level of the repeater falls. This rate of increase is such as to maintain the repeater output level substantially constant.
GB9411/47A 1942-06-20 1947-04-09 Carrier current transmission systems Expired GB622787A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR257586X 1942-06-20

Publications (1)

Publication Number Publication Date
GB622787A true GB622787A (en) 1949-05-06

Family

ID=8884718

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9411/47A Expired GB622787A (en) 1942-06-20 1947-04-09 Carrier current transmission systems

Country Status (4)

Country Link
BE (1) BE451151A (en)
CH (1) CH257586A (en)
FR (1) FR960698A (en)
GB (1) GB622787A (en)

Also Published As

Publication number Publication date
BE451151A (en)
CH257586A (en) 1948-10-15
FR960698A (en) 1950-04-22

Similar Documents

Publication Publication Date Title
GB670801A (en) Improvements in or relating to direct coupled thermionic valve amplifiers
GB775918A (en) Signal transmission circuits including compandors
GB701607A (en) Improvements in or relating to two-way telecommunication systems
GB622787A (en) Carrier current transmission systems
US2752571A (en) Carrier current transmission systems
GB1192690A (en) Improvements in or relating to Wideband Transistor Amplifiers with Gain Control
GB506791A (en) Improvements in or relating to amplifying systems using negative feedback
GB731680A (en) Improvements in or relating to devices for automatic level regulation in multi-channel carrier frequency line transmission systems
GB611390A (en) Improvements in or relating to thermionic valve amplifiers with negative feedback
GB551293A (en) Improvements in automatic gain control for electrical transmission systems
GB592917A (en) Improvements in or relating to volume control and mixing arrangements in broadcasting systems and the like
GB561405A (en) Improvements in or relating to telecommunication systems
GB703801A (en) Improvements in or relating to voice switching in telephone transmission systems
US2546628A (en) Electronic amplifier for threephase current impulses
GB713224A (en) Variable attenuation correcting electrical impedance network
GB1057308A (en) Improvements in or relating to automatic gain control circuits
GB1071729A (en) Improvements in or relating to a.c. attenuators
GB816134A (en) Improvements in or relating to telecommunication systems employing automatic gain regulators
SU379045A1 (en)
US1874466A (en) Transmission regulating system
GB482382A (en) Gain regulating arrangements for electrical signalling systems
US2860194A (en) Circuit arrangement for the transmission of signals
GB737499A (en) An automatic gain control arrangement using a pilot voltage
GB616699A (en) Improvements in or relating to automatic gain control circuits in thermionic valve amplifiers
GB679424A (en) Improvements in or relating to gain control networks for electric wave amplifiers