GB669834A - Improvements in automatic gain control systems - Google Patents

Improvements in automatic gain control systems

Info

Publication number
GB669834A
GB669834A GB3364748A GB3364748A GB669834A GB 669834 A GB669834 A GB 669834A GB 3364748 A GB3364748 A GB 3364748A GB 3364748 A GB3364748 A GB 3364748A GB 669834 A GB669834 A GB 669834A
Authority
GB
United Kingdom
Prior art keywords
amplifier
control
control frequency
gain
frequency
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
GB3364748A
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 Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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 Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB3364748A priority Critical patent/GB669834A/en
Publication of GB669834A publication Critical patent/GB669834A/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

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

669,834. Automatic volume control. BRITISH THOMSON-HOUSTON CO., Ltd., and THOMAS, D. C. Dec. 9, 1949 [Dec. 31, 1948], No. 33647/48. Class 40 (iv). [Also in Group XL (c)] The gain of an amplifier is controlled according to a given function by applying to the input of the amplifier a control frequency which is amplitude modulated according to a function which at any instant is the reciprocal of the given function, the output of the amplifier being maintained constant at the control frequency and the band-width of the amplifier being such that it passes both the control frequency and the carrier frequency it is required to amplify. The control frequency output voltage is maintained constant by means of an automatic gain control system the control voltage of which may be applied to the auxiliary grids of the amplifying valves. The system may be used for simultaneously controlling in accordance with a desired function the gain of a number of amplifiers, the modulated control frequency being applied to each amplifier and a separate A.G.C. system being provided for each. The gain of the series of amplifiers may be kept constant at the carrier frequency to be amplified if the desired function is a constant. The control frequency may be amplitude modulated by means of a cathode-ray tube in which the ray is constrained to trace the contours of a template by means of an electronic servo system as described in Specification 607,397, [Group XL (b)].
GB3364748A 1948-12-31 1948-12-31 Improvements in automatic gain control systems Expired GB669834A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3364748A GB669834A (en) 1948-12-31 1948-12-31 Improvements in automatic gain control systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3364748A GB669834A (en) 1948-12-31 1948-12-31 Improvements in automatic gain control systems

Publications (1)

Publication Number Publication Date
GB669834A true GB669834A (en) 1952-04-09

Family

ID=10355621

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3364748A Expired GB669834A (en) 1948-12-31 1948-12-31 Improvements in automatic gain control systems

Country Status (1)

Country Link
GB (1) GB669834A (en)

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