JPS55102935A - System and device for amplitude equalization - Google Patents

System and device for amplitude equalization

Info

Publication number
JPS55102935A
JPS55102935A JP1016379A JP1016379A JPS55102935A JP S55102935 A JPS55102935 A JP S55102935A JP 1016379 A JP1016379 A JP 1016379A JP 1016379 A JP1016379 A JP 1016379A JP S55102935 A JPS55102935 A JP S55102935A
Authority
JP
Japan
Prior art keywords
level
amplitude
value
interpolated
decrease
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
JP1016379A
Other languages
Japanese (ja)
Inventor
Junji Namiki
Kozo Morita
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 JP1016379A priority Critical patent/JPS55102935A/en
Publication of JPS55102935A publication Critical patent/JPS55102935A/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
    • H04B3/14—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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To equalize the amplitude of an amplitude-distorted input signal accurately and rapidly by exercising control over an increase and decrease in center frequency according to a difference in level value between a 2nd-level interpolation, interpolated from a gradient obtained from a 1st level and 3rd level, and actual value. CONSTITUTION:Signal detector 1090 detects levels P1, P2 and P3 of outputs of band-pass filters provided at three points in a transmission band after the output of a variable resonance circuit whose center frequency omega0 and frequency selectivity Q0 are variable. Then, control (1097) over an increase and decrease in frequency omega0 is exercised according to a difference between actual level P2 and the interpolation value of level P2 interpolated from a gradient found from levels P1 and P3, so that the amplitude of an input signal influenced by amplitude distortion close to reverse characteristics of circuit 1090 can be equalized by variable resonance circuit 1090.
JP1016379A 1979-01-31 1979-01-31 System and device for amplitude equalization Pending JPS55102935A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1016379A JPS55102935A (en) 1979-01-31 1979-01-31 System and device for amplitude equalization

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1016379A JPS55102935A (en) 1979-01-31 1979-01-31 System and device for amplitude equalization

Publications (1)

Publication Number Publication Date
JPS55102935A true JPS55102935A (en) 1980-08-06

Family

ID=11742605

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1016379A Pending JPS55102935A (en) 1979-01-31 1979-01-31 System and device for amplitude equalization

Country Status (1)

Country Link
JP (1) JPS55102935A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5780834A (en) * 1980-09-12 1982-05-20 Thomson Csf Correcting device for amlitude strain for radio signal and receiver associated with same device
JPS5892152A (en) * 1981-11-27 1983-06-01 Hitachi Ltd Control circuit for automatic frequency characteristics
JPS58123239A (en) * 1982-01-19 1983-07-22 Fujitsu Ltd Automatic equalization system
JPS59214340A (en) * 1983-12-15 1984-12-04 Nec Corp System and device for amplitude equalization
JPS6043928A (en) * 1983-08-20 1985-03-08 Fujitsu Ltd Automatic frequency distortion compensating device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5780834A (en) * 1980-09-12 1982-05-20 Thomson Csf Correcting device for amlitude strain for radio signal and receiver associated with same device
JPS5892152A (en) * 1981-11-27 1983-06-01 Hitachi Ltd Control circuit for automatic frequency characteristics
JPS58123239A (en) * 1982-01-19 1983-07-22 Fujitsu Ltd Automatic equalization system
JPH0434336B2 (en) * 1982-01-19 1992-06-05 Fujitsu Ltd
JPS6043928A (en) * 1983-08-20 1985-03-08 Fujitsu Ltd Automatic frequency distortion compensating device
JPS59214340A (en) * 1983-12-15 1984-12-04 Nec Corp System and device for amplitude equalization

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