JPS57183139A - Automatic amplitude equalizing circuit - Google Patents

Automatic amplitude equalizing circuit

Info

Publication number
JPS57183139A
JPS57183139A JP6922381A JP6922381A JPS57183139A JP S57183139 A JPS57183139 A JP S57183139A JP 6922381 A JP6922381 A JP 6922381A JP 6922381 A JP6922381 A JP 6922381A JP S57183139 A JPS57183139 A JP S57183139A
Authority
JP
Japan
Prior art keywords
equalizing circuit
amplitude
variable
deviation
filters
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
JP6922381A
Other languages
Japanese (ja)
Other versions
JPS6315773B2 (en
Inventor
Masato Tawara
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 JP6922381A priority Critical patent/JPS57183139A/en
Publication of JPS57183139A publication Critical patent/JPS57183139A/en
Publication of JPS6315773B2 publication Critical patent/JPS6315773B2/ja
Granted 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
    • H04B3/14—Control of transmission; Equalising characterised by the equalising network used
    • H04B3/143—Control of transmission; Equalising characterised by the equalising network used using amplitude-frequency equalisers
    • H04B3/145—Control of transmission; Equalising characterised by the equalising network used using amplitude-frequency equalisers variable equalisers

Landscapes

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

Abstract

PURPOSE:To eliminate residual amplitude deviation by setting <=5 frequencies for a signal for amplitude equalization, and providing a variable resonance type equalizing circuit with one more primary gradient equalizing circuit. CONSTITUTION:An input signal is supplied to a variable resonance type equalizing circuit 1, whose output is supplied to five filters 11-15 for extracting five different frequencies in a transmission band. Their outputs are inputted to a control circuit 10 through detectors 16-20. According to level relation among the input signals, the control circuit 10 controls the resonance freuqnency and sharpness of the variable resonation type equalizing circuit 1 to obtain simple residual primary gradient deviation without allowing residual amplitude characteristics to vary. Then, signal levels extracted by filters 24 and 25 are equalized to each other by a trailing loop B, eliminating the amplitude deviation completely.
JP6922381A 1981-05-07 1981-05-07 Automatic amplitude equalizing circuit Granted JPS57183139A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6922381A JPS57183139A (en) 1981-05-07 1981-05-07 Automatic amplitude equalizing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6922381A JPS57183139A (en) 1981-05-07 1981-05-07 Automatic amplitude equalizing circuit

Publications (2)

Publication Number Publication Date
JPS57183139A true JPS57183139A (en) 1982-11-11
JPS6315773B2 JPS6315773B2 (en) 1988-04-06

Family

ID=13396506

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6922381A Granted JPS57183139A (en) 1981-05-07 1981-05-07 Automatic amplitude equalizing circuit

Country Status (1)

Country Link
JP (1) JPS57183139A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63301628A (en) * 1987-05-30 1988-12-08 Fujitsu Ltd Transmitting power control system
WO2012029613A1 (en) * 2010-09-01 2012-03-08 日本電気株式会社 Digital filter device, digital filtering method, and control program for digital filter device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63301628A (en) * 1987-05-30 1988-12-08 Fujitsu Ltd Transmitting power control system
WO2012029613A1 (en) * 2010-09-01 2012-03-08 日本電気株式会社 Digital filter device, digital filtering method, and control program for digital filter device
JP4968415B2 (en) * 2010-09-01 2012-07-04 日本電気株式会社 DIGITAL FILTER DEVICE, DIGITAL FILTERING METHOD, AND DIGITAL FILTER DEVICE CONTROL PROGRAM
US8831081B2 (en) 2010-09-01 2014-09-09 Nec Corporation Digital filter device, digital filtering method and control program for the digital filter device

Also Published As

Publication number Publication date
JPS6315773B2 (en) 1988-04-06

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