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GB816134A - Improvements in or relating to telecommunication systems employing automatic gain regulators - Google Patents

Improvements in or relating to telecommunication systems employing automatic gain regulators

Info

Publication number
GB816134A
GB816134A GB3622554A GB3622554A GB816134A GB 816134 A GB816134 A GB 816134A GB 3622554 A GB3622554 A GB 3622554A GB 3622554 A GB3622554 A GB 3622554A GB 816134 A GB816134 A GB 816134A
Authority
GB
United Kingdom
Prior art keywords
amplifier
gain
relating
pilot
automatic gain
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
GB3622554A
Inventor
Anthony Hugh Brian Bower
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
Filing date
Publication date
Application filed by British Telecommunications PLC, British Telecommunications Research Ltd filed Critical British Telecommunications PLC
Publication of GB816134A publication Critical patent/GB816134A/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)

Abstract

816,134. Automatic volume control. BRITISH TELECOMMUNICATIONS RESEARCH Ltd. Dec. 1, 1955 [Dec. 14, 1954], No. 36225/54. Class 40 (4). In a carrier transmission system a repeater includes a line amplifier of which the gain is automatically adjusted in accordance with the received level of a pilot current under the control of a feedback loop which includes a Miller integrator circuit arranged to minimize the envelope gain of the regulated amplifier characteristic. As shown, the pilot signal is passed through the line amplifier, selected by means of a narrow-passband filter, passed through a pilot amplifier, and extended over leads A1 and A2 to a detector D. The output from the detector is smoothed by a Miller integrator circuit V1, C and applied through a D.C. amplifier V2 and lead T to a thermistor which controls the gain of the line amplifier in known manner. Reference has been directed by the Comptroller to Specification 705,901, [Group XL (c)].
GB3622554A 1954-12-14 Improvements in or relating to telecommunication systems employing automatic gain regulators Expired GB816134A (en)

Publications (1)

Publication Number Publication Date
GB816134A true GB816134A (en) 1959-07-08

Family

ID=1744514

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3622554A Expired GB816134A (en) 1954-12-14 Improvements in or relating to telecommunication systems employing automatic gain regulators

Country Status (1)

Country Link
GB (1) GB816134A (en)

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