GB597050A - Automatic gain control - Google Patents

Automatic gain control

Info

Publication number
GB597050A
GB597050A GB10335/45A GB1033545A GB597050A GB 597050 A GB597050 A GB 597050A GB 10335/45 A GB10335/45 A GB 10335/45A GB 1033545 A GB1033545 A GB 1033545A GB 597050 A GB597050 A GB 597050A
Authority
GB
United Kingdom
Prior art keywords
valve
impedance
resistance
automatic gain
gain control
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
GB10335/45A
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.)
Farnsworth Television and Radio Corp
Original Assignee
Farnsworth Television and Radio Corp
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 Farnsworth Television and Radio Corp filed Critical Farnsworth Television and Radio Corp
Publication of GB597050A publication Critical patent/GB597050A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

59 7, 0 5 0. Automatic gain control. FARNSWORTH TELEVISION & RADIO CORPORATION. April 24, 1945, No. 10335. Convention date, July 1, 1944. [Classes 40 (iii) and 40 (v)] An automatic gain control system is designed so as to maintain constant the peak-to-peak value of the signals. The invention is described in its application to a television amplifier in which the output from the image dissector (not shown) is amplified in an electron multiplier 1 having load resistors 6, 7. The desired image signals are taken across resistor 7 and fed through the cathode-anode space of an impedance valve 9 to a broad band amplifier 10 and the further stages 17. Resistance 6 is shunted by a byepass capacity 8 and is connected to the grid of valve 9. In this way the impedance of valve 9 is made to vary inversely with the average value of the image signals received from tube 1, and so the average value of the instantaneous image signal voltages received by valve 10 from resistance 7 through impedance valve 9 is kept constant. Alternatively, the impedance valve 9 may be arranged in shunt across load 7. In that case the polarity of the applied control voltage is reversed. Blanking and synchronising signals from source 18 may be applied in negative polarity through condenser 19 to the grid of valve 9, an isolating resistance 20 being provided.
GB10335/45A 1944-07-01 1945-04-24 Automatic gain control Expired GB597050A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US597050XA 1944-07-01 1944-07-01

Publications (1)

Publication Number Publication Date
GB597050A true GB597050A (en) 1948-01-16

Family

ID=22024709

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10335/45A Expired GB597050A (en) 1944-07-01 1945-04-24 Automatic gain control

Country Status (1)

Country Link
GB (1) GB597050A (en)

Similar Documents

Publication Publication Date Title
US4032973A (en) Positive feedback high gain agc amplifier
GB665872A (en) A cathode ray tube circuit
GB595260A (en) Television signal amplifier
GB1138417A (en) Video signal processing circuits
US2162878A (en) Automatic gain control circuits
GB597050A (en) Automatic gain control
GB740370A (en) Noise cancellation circuits for synchronization pulse separator circuit in a television receiver
US2226255A (en) Thermionic valve circuit
US2570249A (en) Combining and separating circuits
US2504175A (en) Contrast control circuit for television systems
US2652459A (en) Negative feed-back amplifier
US3176236A (en) Drift stabilized amplifier
US2400919A (en) Amplifier circuit
US3037071A (en) Autoamtic chroma control of video amplifier with effect limited to chroma components
US2220165A (en) Noise reducing system
GB643155A (en) Television receiver
US2556692A (en) Variable gain amplifying system
US2945090A (en) Noise inverter circuit
US3132306A (en) Automatic gain control circuit
GB756951A (en) Improvements in or relating to amplifying circuits having automatic gain control especially for picture signals in television receivers
US3292096A (en) Linear, automatic gain control amplifier
US3017576A (en) Dual gain amplifier
US2712599A (en) Automatic gain control for remote cut off tube
GB662677A (en) Phase inverter system
US2629786A (en) Automatic gain control circuit