GB640920A - Improvements in or relating to amplifier and repeater arrangements with automatic gain control - Google Patents

Improvements in or relating to amplifier and repeater arrangements with automatic gain control

Info

Publication number
GB640920A
GB640920A GB10445/47A GB1044547A GB640920A GB 640920 A GB640920 A GB 640920A GB 10445/47 A GB10445/47 A GB 10445/47A GB 1044547 A GB1044547 A GB 1044547A GB 640920 A GB640920 A GB 640920A
Authority
GB
United Kingdom
Prior art keywords
amplifier
rectifier
control
gain
acting
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
GB10445/47A
Inventor
Harold Jefferson
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB640920A publication Critical patent/GB640920A/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
    • H03G7/002—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • H04B1/64—Volume compression or expansion arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

640,920. Automatic gain control. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. April 18, 1947, No. 10445. (Class 40 (v)] In an audio amplifier the gain is jointly controlled by a slow-acting automatic level control and a fast-acting automatic contrast control. Signals from the output of the main amplifier 1 are applied via a branch amplifier 2 to a full-wave rectifier 3C which together with a resistance 3R and load circuit 4, 5 comprises the slow-acting control means. The output of the amplifier 2 is also applied to a rectifier 6C which together with a load circuit 7, 8 comprises the fast-acting control, the potentials across the resistances 4, 8 being additively combined to control the gain of the main amplifier 1. A delay bias may be applied to the rectifier 3C over the lead 3L, and a delay bias may also be applied to the rectifier 6C. The arrangement may be modified by feeding the rectifier 6C from a separate branch amplifier whose gain is controlled in the abovedescribed manner by means of a third rectifier provided with an adjustable delay bias.
GB10445/47A 1947-04-18 1947-04-18 Improvements in or relating to amplifier and repeater arrangements with automatic gain control Expired GB640920A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB275280X 1947-04-18

Publications (1)

Publication Number Publication Date
GB640920A true GB640920A (en) 1950-08-02

Family

ID=10261048

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10445/47A Expired GB640920A (en) 1947-04-18 1947-04-18 Improvements in or relating to amplifier and repeater arrangements with automatic gain control

Country Status (4)

Country Link
CH (1) CH275280A (en)
DE (1) DE846560C (en)
FR (1) FR964881A (en)
GB (1) GB640920A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2750451A (en) * 1951-03-13 1956-06-12 Motorola Inc Audio system
US3398381A (en) * 1965-03-22 1968-08-20 Columbia Broadcasting Syst Inc Control circuit for restricting instantaneous peak levels of audio signals
US4521738A (en) * 1980-03-24 1985-06-04 Sony Corporation Gain control circuit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1048950B (en) * 1956-07-19 1959-01-22 Siemens Ag Message transmission system with an arrangement for noise suppression
US3058068A (en) * 1958-08-11 1962-10-09 Beckman Instruments Inc Clamping circuit for feedback amplifiers
FR1313261A (en) * 1961-11-15 1962-12-28 Thomson Houston Comp Francaise Improvements to control systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2750451A (en) * 1951-03-13 1956-06-12 Motorola Inc Audio system
US3398381A (en) * 1965-03-22 1968-08-20 Columbia Broadcasting Syst Inc Control circuit for restricting instantaneous peak levels of audio signals
US4521738A (en) * 1980-03-24 1985-06-04 Sony Corporation Gain control circuit

Also Published As

Publication number Publication date
FR964881A (en) 1950-08-26
CH275280A (en) 1951-05-15
DE846560C (en) 1952-08-14

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