JPS54144164A - Automatic level control unit - Google Patents

Automatic level control unit

Info

Publication number
JPS54144164A
JPS54144164A JP5303778A JP5303778A JPS54144164A JP S54144164 A JPS54144164 A JP S54144164A JP 5303778 A JP5303778 A JP 5303778A JP 5303778 A JP5303778 A JP 5303778A JP S54144164 A JPS54144164 A JP S54144164A
Authority
JP
Japan
Prior art keywords
level
iref
current
signal
level 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.)
Pending
Application number
JP5303778A
Other languages
Japanese (ja)
Inventor
Hiroyasu Yamaguchi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP5303778A priority Critical patent/JPS54144164A/en
Publication of JPS54144164A publication Critical patent/JPS54144164A/en
Pending 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

Landscapes

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

Abstract

PURPOSE:To avoid the loss in the sense of distance for the sound source in a magnetic recording and reproducing unit, by suppressing the output level to the input signal more than a given level and adjusting the degree of suppression depending on the level of input signal. CONSTITUTION:When the input 11 signal V1 reaches more than a given level and the collector current ID of the transistor Tr18 is greater than the reference current Iref, the difference current ID-Iref flows to the base to turn on Tr19 and charge up the capacitor C23, allowing to suppress the level of the output signal Vo of the base 3. Further, with the increase in the charged up voltage of C23, Tr26 is turned on and small current I which is set with the resistance value of the resistor 27 flows to the collector, but since the condition of turning on Tr19 is ID>Iref+I, then the automatic level control start level is increased by the current I. Thus, at the input signal level V1 starting the automatic level control, I<<Iref is made, and around the level V2 reaching the saturation, I=1/2 Iref is taken, then the signal output by the automatic level control is increased by 3 dB to obtain the curve 50.
JP5303778A 1978-05-02 1978-05-02 Automatic level control unit Pending JPS54144164A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5303778A JPS54144164A (en) 1978-05-02 1978-05-02 Automatic level control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5303778A JPS54144164A (en) 1978-05-02 1978-05-02 Automatic level control unit

Publications (1)

Publication Number Publication Date
JPS54144164A true JPS54144164A (en) 1979-11-10

Family

ID=12931677

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5303778A Pending JPS54144164A (en) 1978-05-02 1978-05-02 Automatic level control unit

Country Status (1)

Country Link
JP (1) JPS54144164A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5652547A (en) * 1995-06-20 1997-07-29 Motorola, Inc. Current comparator automatic output control
JP2010178218A (en) * 2009-01-30 2010-08-12 Furuno Electric Co Ltd Radio communication device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5652547A (en) * 1995-06-20 1997-07-29 Motorola, Inc. Current comparator automatic output control
JP2010178218A (en) * 2009-01-30 2010-08-12 Furuno Electric Co Ltd Radio communication device

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