GB1019296A - Improvements in gain control systems - Google Patents

Improvements in gain control systems

Info

Publication number
GB1019296A
GB1019296A GB4324462A GB4324462A GB1019296A GB 1019296 A GB1019296 A GB 1019296A GB 4324462 A GB4324462 A GB 4324462A GB 4324462 A GB4324462 A GB 4324462A GB 1019296 A GB1019296 A GB 1019296A
Authority
GB
United Kingdom
Prior art keywords
amplifier
signal
diode
output
gain
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
GB4324462A
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Publication of GB1019296A publication Critical patent/GB1019296A/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 without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • H03G3/3015—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable using diodes or transistors

Abstract

1,019,296. Automatic volume control circuits. COMPAGNIE FRANCAISE THOMSONHOUSTON. Nov. 15, 1962 [Nov. 15, 1961], No. 43244/62. Heading H4R. In a gain control system the output signal of an amplifier is compared to a reference voltage and when the output signal exceeds the reference voltage the error signal is used to modify the value of one or more variable impedances in one or several stages of the amplifier so as to cause the gain thereof to be inversely proportional to the input signal when the output exceeds the reference voltage. Fig. 2 shows the preferred embodiment comprising an amplifier the output from which is applied, via a potentiometer P2, to a pair of back-to-back Zener diodes DZ1 and DZ2. Signal pulses corresponding to those parts of the signal exceeding the breakdown voltage of the Zener diodes are amplified in transistor TR3 and applied to the rectifier and filter circuit 5. The resultant D.C. is applied to the variable impedance circuit 6, which comprises a diode D2 supplied with a biasing current from Zener diode DZ, the current from D1 backing of the biasing current through D2 and thereby varying the impedance of diode D2. Since diode D2 is a shunt with the emitter impedance of transistor TR1 in the amplifier 1 the gain of the amplifier is varied and tends to maintain the output constant, once the signal voltage exceeds the reference. The control may be applied to a number of stages in an amplifier.
GB4324462A 1961-11-15 1962-11-15 Improvements in gain control systems Expired GB1019296A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR879054A FR1313261A (en) 1961-11-15 1961-11-15 Improvements to control systems

Publications (1)

Publication Number Publication Date
GB1019296A true GB1019296A (en) 1966-02-02

Family

ID=8766784

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4324462A Expired GB1019296A (en) 1961-11-15 1962-11-15 Improvements in gain control systems

Country Status (4)

Country Link
DE (1) DE1263099B (en)
FR (1) FR1313261A (en)
GB (1) GB1019296A (en)
SE (1) SE313080B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123231A (en) * 1982-06-17 1984-01-25 Ates Componenti Elettron Gain control of audio-amplifying systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5549451B2 (en) * 1972-08-30 1980-12-12

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR964881A (en) * 1947-04-18 1950-08-26
FR968654A (en) * 1947-05-30 1950-12-01 Philips Nv Mounting, variable transmission ratio, to transmit low frequency oscillations
CH302745A (en) * 1951-06-15 1954-10-31 Philips Nv Amplifier circuit.
CH316032A (en) * 1953-05-29 1956-09-15 Siemens Ag Albis Arrangement for the automatic regulation of the output voltage of an amplifier
DE1035209B (en) * 1956-06-23 1958-07-31 Siemens Ag System for electroacoustic transmission
DE1058559B (en) * 1957-11-26 1959-06-04 Philips Nv Control circuit for electric amplifier
CH380972A (en) * 1960-11-10 1964-08-14 Georges Quellet Ing Elect E P Regulator circuit
DE1208164B (en) * 1963-07-31 1965-12-30 August H Wowries Capo

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123231A (en) * 1982-06-17 1984-01-25 Ates Componenti Elettron Gain control of audio-amplifying systems

Also Published As

Publication number Publication date
FR1313261A (en) 1962-12-28
DE1263099B (en) 1968-03-14
SE313080B (en) 1969-08-04

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