JPS57162534A - Automatic gain control circuit - Google Patents

Automatic gain control circuit

Info

Publication number
JPS57162534A
JPS57162534A JP4739381A JP4739381A JPS57162534A JP S57162534 A JPS57162534 A JP S57162534A JP 4739381 A JP4739381 A JP 4739381A JP 4739381 A JP4739381 A JP 4739381A JP S57162534 A JPS57162534 A JP S57162534A
Authority
JP
Japan
Prior art keywords
level
repeater
equalizer
variable
end office
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
JP4739381A
Other languages
Japanese (ja)
Inventor
Shunji Sato
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
Original Assignee
NEC 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 Electric Co Ltd filed Critical NEC Corp
Priority to JP4739381A priority Critical patent/JPS57162534A/en
Publication of JPS57162534A publication Critical patent/JPS57162534A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To simplify the constitution of a titled circuit, by using the 1st variable equalizer which detects the level fluctuation of a repeating transmission line by a monitor current and then receives the control to be set at the transmitting level of an end office plus the 2nd variable equalizer that equalize previously the loss caused between the 1st variable equalizer and the next repeater. CONSTITUTION:The fluctuation of level caused between an end office and an input 118 of a repeater is detected by a monitor current extracting circuit 104 and then rectified through a rectifying circuit 105 to be supplied to differential amplifiers 206 and 209. The amplifier 206 controls a variable impedance 203 based on the result of comparison to the reference voltage 107 and sets the output of the 1st equalizer 202 at the same transmission level of an end office 401. The amplifier 209 controls a variable impedance 110 and compensates previously the level loss caused between the using repeater and the following repeater.
JP4739381A 1981-03-31 1981-03-31 Automatic gain control circuit Pending JPS57162534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4739381A JPS57162534A (en) 1981-03-31 1981-03-31 Automatic gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4739381A JPS57162534A (en) 1981-03-31 1981-03-31 Automatic gain control circuit

Publications (1)

Publication Number Publication Date
JPS57162534A true JPS57162534A (en) 1982-10-06

Family

ID=12773860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4739381A Pending JPS57162534A (en) 1981-03-31 1981-03-31 Automatic gain control circuit

Country Status (1)

Country Link
JP (1) JPS57162534A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6251319A (en) * 1985-08-28 1987-03-06 インターナショナル　ビジネス　マシーンズ　コーポレーション Gain adjustment for modem receiver

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5427712A (en) * 1977-08-03 1979-03-02 Sits Soc It Telecom Siemens Automatic repeater gain control system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5427712A (en) * 1977-08-03 1979-03-02 Sits Soc It Telecom Siemens Automatic repeater gain control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6251319A (en) * 1985-08-28 1987-03-06 インターナショナル　ビジネス　マシーンズ　コーポレーション Gain adjustment for modem receiver
JPH0556693B2 (en) * 1985-08-28 1993-08-20 Ibm

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