GB705368A - Improvements relating to automatic gain control circuits - Google Patents

Improvements relating to automatic gain control circuits

Info

Publication number
GB705368A
GB705368A GB3216049A GB3216049A GB705368A GB 705368 A GB705368 A GB 705368A GB 3216049 A GB3216049 A GB 3216049A GB 3216049 A GB3216049 A GB 3216049A GB 705368 A GB705368 A GB 705368A
Authority
GB
United Kingdom
Prior art keywords
gain control
automatic gain
grid
valve
voltage
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
GB3216049A
Inventor
William James Rosser
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB3216049A priority Critical patent/GB705368A/en
Publication of GB705368A publication Critical patent/GB705368A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/02—Volume compression or expansion in amplifiers having discharge tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/52—Automatic gain control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

705,368. Valve amplifying circuits; automatic gain control. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Dec. 4, 1950 [Dec. 15, 1949], No. 32160/49. Classes 40 (5) and 40 (6) An automatic gain control circuit comprises a pair of valves provided with a common cathode resistance 2 of large value, the signals to be controlled being fed to the grid of the one valve, 1, and the automatic gain control potential to the grid of the other, 4. The output is taken across the resistance 2. It may alternatively be obtained from a load impedance in the anode circuit of either of the valves, Figs. 5, 6 (not shown). The arrangement is more particularly intended for use in the video amplifier of a television receiver, in which an automatic gain control voltage is derived by peak rectification of the sync pulses ; the voltage so obtained is compared with a stable reference voltage, which is applied to the grid of the valve 1 to which the signals are fed. Specifications 515,364 and 517,666 are referred to.
GB3216049A 1949-12-15 1949-12-15 Improvements relating to automatic gain control circuits Expired GB705368A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3216049A GB705368A (en) 1949-12-15 1949-12-15 Improvements relating to automatic gain control circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3216049A GB705368A (en) 1949-12-15 1949-12-15 Improvements relating to automatic gain control circuits

Publications (1)

Publication Number Publication Date
GB705368A true GB705368A (en) 1954-03-10

Family

ID=10334230

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3216049A Expired GB705368A (en) 1949-12-15 1949-12-15 Improvements relating to automatic gain control circuits

Country Status (1)

Country Link
GB (1) GB705368A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002090A (en) * 1958-08-27 1961-09-26 Hazeltine Research Inc Automatic-gain-control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002090A (en) * 1958-08-27 1961-09-26 Hazeltine Research Inc Automatic-gain-control system

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