JPS5491165A - Agc system - Google Patents

Agc system

Info

Publication number
JPS5491165A
JPS5491165A JP15876677A JP15876677A JPS5491165A JP S5491165 A JPS5491165 A JP S5491165A JP 15876677 A JP15876677 A JP 15876677A JP 15876677 A JP15876677 A JP 15876677A JP S5491165 A JPS5491165 A JP S5491165A
Authority
JP
Japan
Prior art keywords
amplitude
output
circuit
amplifier
lpf
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
JP15876677A
Other languages
Japanese (ja)
Other versions
JPS5828961B2 (en
Inventor
Tadahiko Yanajima
Koji Uno
Shuichi Takanami
Kyoichi Arai
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.)
Fujitsu Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
Nippon Telegraph and Telephone 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 Fujitsu Ltd, Nippon Telegraph and Telephone Corp filed Critical Fujitsu Ltd
Priority to JP15876677A priority Critical patent/JPS5828961B2/en
Publication of JPS5491165A publication Critical patent/JPS5491165A/en
Publication of JPS5828961B2 publication Critical patent/JPS5828961B2/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
    • H03G3/30—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 absorb the amplitude fluctuation dependent upon the irregularity of head efficiency and the unevenness of a medium by using an amplitude discriminator independent of data patterns to reduce the time constant of a LPF and make a high-speed response possible and rducing the drop of control signals even in case of no input signal. CONSTITUTION:Variable gain amplifier GAC where input signal Vsi is inputted and amplitude equalizer EQL where the output of this amplifier GAC is inputted are provided, and the output of this equalizer EQL is connected to output terminal Vso and rectifier circuit REC. Further, this output is connected to a circuit which constitutes an amplitude discrimination filter DET LF independent of data patterns, and this circuit is provided with selector switches SW1 and SW2, which control the charge and the discgarge of capacitor C, and amplitude comparators CMP1 nd CMP2, and the output of this circuit is applied to amplifier GCA. Then, the time constant of LPF LF is reduced to make a high-speed response possible and absorb amplitude fluctuation.
JP15876677A 1977-12-28 1977-12-28 AGC method Expired JPS5828961B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15876677A JPS5828961B2 (en) 1977-12-28 1977-12-28 AGC method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15876677A JPS5828961B2 (en) 1977-12-28 1977-12-28 AGC method

Publications (2)

Publication Number Publication Date
JPS5491165A true JPS5491165A (en) 1979-07-19
JPS5828961B2 JPS5828961B2 (en) 1983-06-20

Family

ID=15678862

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15876677A Expired JPS5828961B2 (en) 1977-12-28 1977-12-28 AGC method

Country Status (1)

Country Link
JP (1) JPS5828961B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5516538A (en) * 1978-07-20 1980-02-05 Nec Corp Automatic level regulator circuit
FR2518850A1 (en) * 1981-12-17 1983-06-24 Philips Nv AMPLITUDE ADJUSTMENT SYSTEM
JPS60116213A (en) * 1983-11-28 1985-06-22 Sony Corp Automatic gain control circuit
JPH0298205A (en) * 1988-10-05 1990-04-10 Nec Corp Automatic gain control circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5516538A (en) * 1978-07-20 1980-02-05 Nec Corp Automatic level regulator circuit
FR2518850A1 (en) * 1981-12-17 1983-06-24 Philips Nv AMPLITUDE ADJUSTMENT SYSTEM
JPS60116213A (en) * 1983-11-28 1985-06-22 Sony Corp Automatic gain control circuit
JPH0516694B2 (en) * 1983-11-28 1993-03-05 Sony Corp
JPH0298205A (en) * 1988-10-05 1990-04-10 Nec Corp Automatic gain control circuit

Also Published As

Publication number Publication date
JPS5828961B2 (en) 1983-06-20

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