JPS5491164A - Agc system - Google Patents

Agc system

Info

Publication number
JPS5491164A
JPS5491164A JP15876477A JP15876477A JPS5491164A JP S5491164 A JPS5491164 A JP S5491164A JP 15876477 A JP15876477 A JP 15876477A JP 15876477 A JP15876477 A JP 15876477A JP S5491164 A JPS5491164 A JP S5491164A
Authority
JP
Japan
Prior art keywords
amplitude
discriminator
output
equalizer
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
JP15876477A
Other languages
Japanese (ja)
Other versions
JPS6149742B2 (en
Inventor
Takao Nagaoke
Tadahiko Yanajima
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 JP15876477A priority Critical patent/JPS5491164A/en
Publication of JPS5491164A publication Critical patent/JPS5491164A/en
Publication of JPS6149742B2 publication Critical patent/JPS6149742B2/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)
  • Digital Magnetic Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To absorb the amplitude fluctuation of high-speed modulation signals by providing additionally an amplitude equalizer in an AGC circuit, which is constituted by a variable gain amplifier, an smplitude discriminator, a LPF, etc., and applying the output of the equalizer to the amplitude discriminator to reduce the dependence of a detection output upon data patterns. CONSTITUTION:Amplitude equalizer EQL is privided in the input side of amplitude discriminator DET in an AGC circuit which is constituted by variable gain amplifier GCA, where input signal Vsi is inputted, amplitude discriminator DET and LPF LF. Then, the level of input signal Vsi is arranged, and simultaneously, harmonic components of input signal Vsi are emphasized to make a pulse narrow. Then, peak shift is reduced, and the dependence of detection output Vd of amplitude discriminator DET upon data patterns is reduced. As a result, the time constant of LPF LF is made small to absorb the amplitude fluctuation of high-speed modulation signals. Equivalent effects can be obtained if amplitude equalizer EQL' is provided in the output signal bus for output signals.
JP15876477A 1977-12-28 1977-12-28 Agc system Granted JPS5491164A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15876477A JPS5491164A (en) 1977-12-28 1977-12-28 Agc system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15876477A JPS5491164A (en) 1977-12-28 1977-12-28 Agc system

Publications (2)

Publication Number Publication Date
JPS5491164A true JPS5491164A (en) 1979-07-19
JPS6149742B2 JPS6149742B2 (en) 1986-10-30

Family

ID=15678819

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15876477A Granted JPS5491164A (en) 1977-12-28 1977-12-28 Agc system

Country Status (1)

Country Link
JP (1) JPS5491164A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60113362A (en) * 1983-11-24 1985-06-19 Rohm Co Ltd Floppy disk device
JPH07154172A (en) * 1993-11-29 1995-06-16 Nec Corp Voice limiter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60113362A (en) * 1983-11-24 1985-06-19 Rohm Co Ltd Floppy disk device
JPH07154172A (en) * 1993-11-29 1995-06-16 Nec Corp Voice limiter

Also Published As

Publication number Publication date
JPS6149742B2 (en) 1986-10-30

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