GB1172310A - Improvements in Electrical Signal Limiters and Related Devices - Google Patents

Improvements in Electrical Signal Limiters and Related Devices

Info

Publication number
GB1172310A
GB1172310A GB1273367A GB1273367A GB1172310A GB 1172310 A GB1172310 A GB 1172310A GB 1273367 A GB1273367 A GB 1273367A GB 1273367 A GB1273367 A GB 1273367A GB 1172310 A GB1172310 A GB 1172310A
Authority
GB
United Kingdom
Prior art keywords
resistor
control circuit
time
circuit
constant
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
GB1273367A
Inventor
Reginald Leonard Deane
William Isbister Manson
Donovan Ernest Lea Shorter
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 Broadcasting Corp
Original Assignee
British Broadcasting 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 British Broadcasting Corp filed Critical British Broadcasting Corp
Priority to GB1273367A priority Critical patent/GB1172310A/en
Publication of GB1172310A publication Critical patent/GB1172310A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • 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

Abstract

1,172,310. Automatic gain control. BRITISH BROADCASTING CO. 27 March, 1968 [17 March, 1967], No. 12733/67. Heading H3T. In a compressor circuit comprising a variable gain element and a control circuit for controlling the gain thereof, the time in which the control circuit responds to a decrease in signal amplitude varies with the signal amplitude while the time in which the control circuit responds to an increase in signal amplitude is not so varied. The gain of variable gain element 21 is controlled by a control circuit comprising full-wave diode rectifiers D1, D3, having a time-constant circuit comprising capacitor C1 and resistor R1 in shunt with which is resistor R4 in series with the drain to source path of a field effect transistor TR. A second control circuit comprising full-wave diode rectifiers D2, D4 provided with delay bias source 20 controls the gate potential of field effect transistor TR via smoothing circuit R2, C2 and a voltage-limiting Zener diode Z in conjunction with resistor R3. At small signal levels diodes D2, D4 are non-conductive, fieldeffect transistor TR biased to low impedance, and resistor R4 shunted across resistor R1 giving an automatic gain control of short return time-constant. On large signals, however, diodes D2, D4 become conductive and bias field-effect transistor TR to high impedance, whereby the return time-constant of the automatic gain control is determined by resistor R1 alone and is high.
GB1273367A 1967-03-17 1967-03-17 Improvements in Electrical Signal Limiters and Related Devices Expired GB1172310A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1273367A GB1172310A (en) 1967-03-17 1967-03-17 Improvements in Electrical Signal Limiters and Related Devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1273367A GB1172310A (en) 1967-03-17 1967-03-17 Improvements in Electrical Signal Limiters and Related Devices

Publications (1)

Publication Number Publication Date
GB1172310A true GB1172310A (en) 1969-11-26

Family

ID=10010100

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1273367A Expired GB1172310A (en) 1967-03-17 1967-03-17 Improvements in Electrical Signal Limiters and Related Devices

Country Status (1)

Country Link
GB (1) GB1172310A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4521738A (en) * 1980-03-24 1985-06-04 Sony Corporation Gain control circuit
GB2179807A (en) * 1985-07-16 1987-03-11 Pioneer Electronic Corp Automatic volume control
GB2197567A (en) * 1986-10-13 1988-05-18 Mitsubishi Electric Corp Companders

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4521738A (en) * 1980-03-24 1985-06-04 Sony Corporation Gain control circuit
GB2179807A (en) * 1985-07-16 1987-03-11 Pioneer Electronic Corp Automatic volume control
GB2179807B (en) * 1985-07-16 1989-07-19 Pioneer Electronic Corp Automatic sound volume controlling device for use in automotive vehicle
GB2197567A (en) * 1986-10-13 1988-05-18 Mitsubishi Electric Corp Companders
US4862118A (en) * 1986-10-13 1989-08-29 Mitsubishi Denki Kabushiki Kaisha Signal processing system using a compressor and an expander
GB2197567B (en) * 1986-10-13 1990-10-31 Mitsubishi Electric Corp Signal processing system

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee