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GB1085167A - Amplifier regulation - Google Patents

Amplifier regulation

Info

Publication number
GB1085167A
GB1085167A GB2129966A GB2129966A GB1085167A GB 1085167 A GB1085167 A GB 1085167A GB 2129966 A GB2129966 A GB 2129966A GB 2129966 A GB2129966 A GB 2129966A GB 1085167 A GB1085167 A GB 1085167A
Authority
GB
United Kingdom
Prior art keywords
gain
network
pilot
circuit
amplifier
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
GB2129966A
Inventor
Donald Robert Barber
Richard Alfred Nye
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
Priority to US433998A priority Critical patent/US3510793A/en
Priority to NL6502215A priority patent/NL6502215A/xx
Priority to DEST23409A priority patent/DE1233915B/en
Priority to CH250265A priority patent/CH427917A/en
Priority to FR7189A priority patent/FR1426509A/en
Priority to BE660269D priority patent/BE660269A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2129966A priority patent/GB1085167A/en
Priority to DE19671512711 priority patent/DE1512711B2/en
Priority to US637416A priority patent/US3441866A/en
Priority to CH678167A priority patent/CH462896A/en
Priority to BE698388D priority patent/BE698388A/xx
Priority to SE06672/67A priority patent/SE337238B/xx
Priority to FR106229A priority patent/FR92450E/en
Priority to NL6706646A priority patent/NL6706646A/xx
Publication of GB1085167A publication Critical patent/GB1085167A/en
Priority to GB1265108D priority patent/GB1265108A/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
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/005—Control by a pilot signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/06—Control of transmission; Equalising by the transmitted signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

1,085,167. Auomatic volume control. STANDARD TELEPHONES & CABLES Ltd. May 13, 1966, No. 21299/66. Heading H4R. In a pilot-operated automatic volume control device a D.C. voltage derived from the pilot signal by filtering, rectifying, and amplifying, in units 10 and 11 of the Figure, is applied via control circuit 12, fed also with a reference level at terminal 14, and a switching circuit to control the current flow through a field effect transistor 8, and hence the gain of amplifier 2a. Abnormal variations of the received pilot level are detected by the control circuit 13 and cause opening of the switching circuit comprising the field effect transistor 15 so that the low leakage capacitor 16 remains charged to the value it held immediately before the occurrence of the abnormal pilot level, and the gain of amplifier 2a is therefore held constant. The f.e.t. 8 may, as shown, feed a thermistor 4 connected, via a capacitor 5 to stand off D.C., in the gain con trolling circuit of network 3, alternatively an indirectly heated thermistor may be used in the network 3 with its heater current fed via f.e.t. 8, or the f.e.t. 8 may be connected directly in network 3 so that the gain is controlled by variation of the impedance of f.e.t. 8.
GB2129966A 1964-02-26 1966-05-13 Amplifier regulation Expired GB1085167A (en)

Priority Applications (15)

Application Number Priority Date Filing Date Title
US433998A US3510793A (en) 1964-02-26 1965-02-19 Amplifier regulator employing an electrolytic variable resistance device
NL6502215A NL6502215A (en) 1964-02-26 1965-02-22
DEST23409A DE1233915B (en) 1964-02-26 1965-02-23 Circuit arrangement for the pilot control of amplifiers in transmission systems
CH250265A CH427917A (en) 1964-02-26 1965-02-24 Transmission device with an amplifier
FR7189A FR1426509A (en) 1964-02-26 1965-02-26 Control device for powerline transmission system
BE660269D BE660269A (en) 1964-02-26 1965-02-26
GB2129966A GB1085167A (en) 1966-05-13 1966-05-13 Amplifier regulation
DE19671512711 DE1512711B2 (en) 1964-02-26 1967-05-09 ARRANGEMENT FOR PILOT-CONTROLLED GAIN CONTROL OF AMPLIFIERS, IN PARTICULAR INTERAMPLIFIER OF CARRIER FREQUENCY TECHNOLOGY
US637416A US3441866A (en) 1964-02-26 1967-05-10 Amplifier regulation
CH678167A CH462896A (en) 1964-02-26 1967-05-12 Arrangement for pilot-controlled gain control of amplifiers, in particular intermediate amplifiers in carrier frequency technology
BE698388D BE698388A (en) 1964-02-26 1967-05-12
SE06672/67A SE337238B (en) 1964-02-26 1967-05-12
FR106229A FR92450E (en) 1964-02-26 1967-05-12 Control device for powerline transmission system
NL6706646A NL6706646A (en) 1964-02-26 1967-05-12
GB1265108D GB1265108A (en) 1964-02-26 1970-09-24

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2129966A GB1085167A (en) 1966-05-13 1966-05-13 Amplifier regulation
GB4542470 1970-09-24

Publications (1)

Publication Number Publication Date
GB1085167A true GB1085167A (en) 1967-09-27

Family

ID=26255255

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2129966A Expired GB1085167A (en) 1964-02-26 1966-05-13 Amplifier regulation

Country Status (1)

Country Link
GB (1) GB1085167A (en)

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