JPS5769915A - Automatic gain control circuit - Google Patents

Automatic gain control circuit

Info

Publication number
JPS5769915A
JPS5769915A JP14644680A JP14644680A JPS5769915A JP S5769915 A JPS5769915 A JP S5769915A JP 14644680 A JP14644680 A JP 14644680A JP 14644680 A JP14644680 A JP 14644680A JP S5769915 A JPS5769915 A JP S5769915A
Authority
JP
Japan
Prior art keywords
circuit
gain
inputted
change
signals
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.)
Granted
Application number
JP14644680A
Other languages
Japanese (ja)
Other versions
JPS648925B2 (en
Inventor
Kenzo Akagiri
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP14644680A priority Critical patent/JPS5769915A/en
Publication of JPS5769915A publication Critical patent/JPS5769915A/en
Publication of JPS648925B2 publication Critical patent/JPS648925B2/ja
Granted 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
    • H03G3/30—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To control the gain with an optimum time constant automatically independently of types of signals, by changing the time constant of control through the detection of time change of signals, in a circuit controlling the gain according to the envelope information of the signals. CONSTITUTION:One of an input signal is inputted to a variable gain circuit 3 and another is inputted to a circuit 5 controlling the gain of a variable gain circuit according to the envelope information. A part of the envelope information is inputted to an inverting input terminal of a differential amplifier 13 via a delay circuit 12 and inputted to a noninverting input terminal as it is. As a result, the change in the time input signal is picked up as an output of the differential amplifier 13. This change amount is given to a gain control signal generating circuit 8 to change in the time constant of attack and recovery time.
JP14644680A 1980-10-20 1980-10-20 Automatic gain control circuit Granted JPS5769915A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14644680A JPS5769915A (en) 1980-10-20 1980-10-20 Automatic gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14644680A JPS5769915A (en) 1980-10-20 1980-10-20 Automatic gain control circuit

Publications (2)

Publication Number Publication Date
JPS5769915A true JPS5769915A (en) 1982-04-30
JPS648925B2 JPS648925B2 (en) 1989-02-15

Family

ID=15407824

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14644680A Granted JPS5769915A (en) 1980-10-20 1980-10-20 Automatic gain control circuit

Country Status (1)

Country Link
JP (1) JPS5769915A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60176315A (en) * 1984-02-21 1985-09-10 Rohm Co Ltd Automatic gain adjusting circuit
JP2009171092A (en) * 2008-01-15 2009-07-30 Audio Technica Corp Audio apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4929045A (en) * 1972-07-12 1974-03-15

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4929045A (en) * 1972-07-12 1974-03-15

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60176315A (en) * 1984-02-21 1985-09-10 Rohm Co Ltd Automatic gain adjusting circuit
JP2009171092A (en) * 2008-01-15 2009-07-30 Audio Technica Corp Audio apparatus

Also Published As

Publication number Publication date
JPS648925B2 (en) 1989-02-15

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