JPS57207440A - Variable circuit for amplitude characteristic - Google Patents

Variable circuit for amplitude characteristic

Info

Publication number
JPS57207440A
JPS57207440A JP9246681A JP9246681A JPS57207440A JP S57207440 A JPS57207440 A JP S57207440A JP 9246681 A JP9246681 A JP 9246681A JP 9246681 A JP9246681 A JP 9246681A JP S57207440 A JPS57207440 A JP S57207440A
Authority
JP
Japan
Prior art keywords
path
delay
amplitude
variable
blocksiand
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
JP9246681A
Other languages
Japanese (ja)
Inventor
Sadao Takenaka
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
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP9246681A priority Critical patent/JPS57207440A/en
Publication of JPS57207440A publication Critical patent/JPS57207440A/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 vary the amplitude characteristics only without changing the delay characteristics, by selecting the characteristics of each component and the location so that the delay characteristics can be of inverse characteristics, in two cascade-connected circuits. CONSTITUTION:BlocksIand II constitute an amplitude equalizer. Each block is provided with the 1st path L1 and the 2nd path L2 of parallel connection, and no component is inserted to the path L1 of the blockIand a variable attenuator AT1, a delay line DL1 and a variable phase device PH1 are inserted to the path L2 in series connection. A variable attenuator AT2 is inserted to the path L1 of the block II and a delay line DL2 and a variable phase shifter PH2 are inserted to the path L2. A common control signal is given to the attenuators AT1 and AT2 from a terminal C-AT and to the phase shifters PH1 and PH2 from a terminal C-PH. Since the inserted path of the attenuators AT is different for the blocksIand II, the positive and negative polarities of the delay characteristics are reversed. Thus, the delay characteristics are cancelled and the slope of the amplitude is steep.
JP9246681A 1981-06-16 1981-06-16 Variable circuit for amplitude characteristic Pending JPS57207440A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9246681A JPS57207440A (en) 1981-06-16 1981-06-16 Variable circuit for amplitude characteristic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9246681A JPS57207440A (en) 1981-06-16 1981-06-16 Variable circuit for amplitude characteristic

Publications (1)

Publication Number Publication Date
JPS57207440A true JPS57207440A (en) 1982-12-20

Family

ID=14055114

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9246681A Pending JPS57207440A (en) 1981-06-16 1981-06-16 Variable circuit for amplitude characteristic

Country Status (1)

Country Link
JP (1) JPS57207440A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257526A2 (en) * 1986-08-18 1988-03-02 Fujitsu Limited Amplitude equalizer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257526A2 (en) * 1986-08-18 1988-03-02 Fujitsu Limited Amplitude equalizer

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