JPS55121717A - Inclined type automatic gain control circuit - Google Patents

Inclined type automatic gain control circuit

Info

Publication number
JPS55121717A
JPS55121717A JP2859979A JP2859979A JPS55121717A JP S55121717 A JPS55121717 A JP S55121717A JP 2859979 A JP2859979 A JP 2859979A JP 2859979 A JP2859979 A JP 2859979A JP S55121717 A JPS55121717 A JP S55121717A
Authority
JP
Japan
Prior art keywords
signal
value
frequency characteristics
peak value
output
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
JP2859979A
Other languages
Japanese (ja)
Other versions
JPS6223488B2 (en
Inventor
Toru Koyama
Toshihiko Wakahara
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.)
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
Nippon 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 NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2859979A priority Critical patent/JPS55121717A/en
Publication of JPS55121717A publication Critical patent/JPS55121717A/en
Publication of JPS6223488B2 publication Critical patent/JPS6223488B2/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)
  • Filters And Equalizers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To ensure the suitable application for the characteristics compensation of the transmission circuit by securing the gain-frequency characteristics of different trends in correspondence to the different level ranges of the input signals. CONSTITUTION:Input signal e is applied to frequency characteristics variable circuit 11, and the peak value of output signal g of frequency characteristics variable circuit 12 emerges larger than the fixed value to be controlled. In such case, signal g is detected by peak value detection circuit 13 to deliver signal h proportional to the peak value. If signal h is larger than either of reference value E1 and E2, both error outputs i and j of error amplification circuits 14 and 15 feature the large value. As a result, the gains of circuits 11 and 12 are controlled to decrease, and thus signal g decreases. Accordingly, output j also decreases, and as a result output g is stabilized to the fixed value.
JP2859979A 1979-03-14 1979-03-14 Inclined type automatic gain control circuit Granted JPS55121717A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2859979A JPS55121717A (en) 1979-03-14 1979-03-14 Inclined type automatic gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2859979A JPS55121717A (en) 1979-03-14 1979-03-14 Inclined type automatic gain control circuit

Publications (2)

Publication Number Publication Date
JPS55121717A true JPS55121717A (en) 1980-09-19
JPS6223488B2 JPS6223488B2 (en) 1987-05-23

Family

ID=12253046

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2859979A Granted JPS55121717A (en) 1979-03-14 1979-03-14 Inclined type automatic gain control circuit

Country Status (1)

Country Link
JP (1) JPS55121717A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5286702A (en) * 1976-01-14 1977-07-19 Hitachi Ltd Automatic equalizer system
JPS5385108A (en) * 1977-01-05 1978-07-27 Hitachi Ltd Automatic gain control system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5286702A (en) * 1976-01-14 1977-07-19 Hitachi Ltd Automatic equalizer system
JPS5385108A (en) * 1977-01-05 1978-07-27 Hitachi Ltd Automatic gain control system

Also Published As

Publication number Publication date
JPS6223488B2 (en) 1987-05-23

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