GB750519A - Improvements in automatic control devices for use in telecommunication systems - Google Patents

Improvements in automatic control devices for use in telecommunication systems

Info

Publication number
GB750519A
GB750519A GB2509453A GB2509453A GB750519A GB 750519 A GB750519 A GB 750519A GB 2509453 A GB2509453 A GB 2509453A GB 2509453 A GB2509453 A GB 2509453A GB 750519 A GB750519 A GB 750519A
Authority
GB
United Kingdom
Prior art keywords
transductor
output
current
control
amplified
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
GB2509453A
Inventor
George Alexander Dodd
Peter Vivian Wilson Jude
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.)
British Telecommunications PLC
British Telecommunications Research Ltd
Original Assignee
British Telecommunications PLC
British Telecommunications Research Ltd
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 British Telecommunications PLC, British Telecommunications Research Ltd filed Critical British Telecommunications PLC
Priority to GB2509453A priority Critical patent/GB750519A/en
Publication of GB750519A publication Critical patent/GB750519A/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)
  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)

Abstract

750,519. Automatic gain &c. control. BRITISH TELECOMMUNICATIONS RESEARCH Ltd. Sept. 7, 1954 [Sept. 10, 1953], No. 25094/53. Class 40 (4). In an arrangement for regulating the gain, frequency or phase in a carrier current communication system, the discrepancy between a pilot current and a reference current is caused to vary the control current of a magnetic transductor the A.C. output of which is made to effect the necessary correction. The pilot current selected by a filter F, Fig. 1, is amplified and compared with a reference D.C. and the resultant current controls a network # in the feedback path of a line amplifier LA through a magnetic transductor MT. The pilot current applied at terminals T1, T2, Fig. 4, is amplified in pentode V1 and the output which is rectified in a voltage doubler MR1, MR2, is re-amplified in a reflex arrangement to control the transductor MT1. A D.C. reference potential is tapped off from resistor R2 across the H.T. supply and the A.C. output from the transductor controls a heater H1 of a thermistor TR1. A modified arrangement includes a pre-amplifier stage and has the transductor in the anode circuit of the second stage, Fig. 3 (not shown). In a further modification, Fig. 5, using a directly heated thermistor which is temperature-biased by an auxiliary theater, the magnetic amplifier MA comprises a control winding W1, a balanced polarizing winding W2 which is fed from a D.C. source via a potentiometer R13, and a balanced output winding W3 which is fed with A.C. by transformer T. The output is rectified in a bridge RB and the connection to thermistor TR3 includes a low-pass filter F4.
GB2509453A 1953-09-10 1953-09-10 Improvements in automatic control devices for use in telecommunication systems Expired GB750519A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2509453A GB750519A (en) 1953-09-10 1953-09-10 Improvements in automatic control devices for use in telecommunication systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2509453A GB750519A (en) 1953-09-10 1953-09-10 Improvements in automatic control devices for use in telecommunication systems

Publications (1)

Publication Number Publication Date
GB750519A true GB750519A (en) 1956-06-20

Family

ID=10222128

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2509453A Expired GB750519A (en) 1953-09-10 1953-09-10 Improvements in automatic control devices for use in telecommunication systems

Country Status (1)

Country Link
GB (1) GB750519A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1080612B (en) * 1956-12-21 1960-04-28 Cie Ind Des Telephones Soc An Magnetic amplifier arrangement with a magnetic control amplifier and with at least one controlled magnetic amplifier located in the same thermal influence area
DE1288640B (en) * 1964-11-04 1969-02-06 Ampex Electrically controllable damping element and circuit arrangement for automatic level control with such a damping element

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1080612B (en) * 1956-12-21 1960-04-28 Cie Ind Des Telephones Soc An Magnetic amplifier arrangement with a magnetic control amplifier and with at least one controlled magnetic amplifier located in the same thermal influence area
DE1288640B (en) * 1964-11-04 1969-02-06 Ampex Electrically controllable damping element and circuit arrangement for automatic level control with such a damping element

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