JPH0533880B2 - - Google Patents

Info

Publication number
JPH0533880B2
JPH0533880B2 JP6240187A JP6240187A JPH0533880B2 JP H0533880 B2 JPH0533880 B2 JP H0533880B2 JP 6240187 A JP6240187 A JP 6240187A JP 6240187 A JP6240187 A JP 6240187A JP H0533880 B2 JPH0533880 B2 JP H0533880B2
Authority
JP
Japan
Prior art keywords
wire
operational amplifier
impedance
input
circuit
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.)
Expired - Lifetime
Application number
JP6240187A
Other languages
English (en)
Japanese (ja)
Other versions
JPS63229995A (ja
Inventor
Toshoshi Kitaguchi
Kenji Sakai
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 JP6240187A priority Critical patent/JPS63229995A/ja
Publication of JPS63229995A publication Critical patent/JPS63229995A/ja
Publication of JPH0533880B2 publication Critical patent/JPH0533880B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interface Circuits In Exchanges (AREA)
JP6240187A 1987-03-19 1987-03-19 二線−四線変換回路 Granted JPS63229995A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6240187A JPS63229995A (ja) 1987-03-19 1987-03-19 二線−四線変換回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6240187A JPS63229995A (ja) 1987-03-19 1987-03-19 二線−四線変換回路

Publications (2)

Publication Number Publication Date
JPS63229995A JPS63229995A (ja) 1988-09-26
JPH0533880B2 true JPH0533880B2 (cg-RX-API-DMAC7.html) 1993-05-20

Family

ID=13199076

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6240187A Granted JPS63229995A (ja) 1987-03-19 1987-03-19 二線−四線変換回路

Country Status (1)

Country Link
JP (1) JPS63229995A (cg-RX-API-DMAC7.html)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2831684B2 (ja) * 1989-03-20 1998-12-02 株式会社東芝 電話システム
DE59003361D1 (de) * 1990-03-27 1993-12-09 Siemens Ag Zweidraht-Vierdraht-Umsetzer.
DE59003360D1 (de) * 1990-03-27 1993-12-09 Siemens Ag Zweidraht-Vierdraht-Umsetzer.

Also Published As

Publication number Publication date
JPS63229995A (ja) 1988-09-26

Similar Documents

Publication Publication Date Title
JP2645022B2 (ja) 加入者回路
US4472608A (en) Subscriber line interface circuit
JPS5921237B2 (ja) 電話ライン回路
JP2898165B2 (ja) ハイブリッド回路
IE44521B1 (en) A hybrid circuit arrangement
JPH0533880B2 (cg-RX-API-DMAC7.html)
CA2356952A1 (en) A method and apparatus for an improved analog echo canceller
JPS5816782B2 (ja) 電話器用送受信回路
US4358644A (en) Bilateral current source for a multi-terminal intercom
US4758822A (en) Bidirectional amplifier
EP1142150B1 (en) Echo and distortion cancellation arrangement
JP2867396B2 (ja) ２線４線変換回路
JP2746084B2 (ja) 会議装置
JP3494468B2 (ja) ハイブリッド回路及びこれを用いた装置
JPH0439957B2 (cg-RX-API-DMAC7.html)
JP2582802B2 (ja) ２線４線変換回路
JPH0740675B2 (ja) ２線４線変換回路
JPH03106288A (ja) 廻込み抑圧回路
JPH01265728A (ja) ２線４線変換回路
JPH0396055A (ja) ２線４線回路
JPS6229349A (ja) 電話機用増幅回路
JPS6119199B2 (cg-RX-API-DMAC7.html)
AU681169B2 (en) Line termination circuit
US3535475A (en) Differential type telephone repeater circuit
JPS6143840A (ja) 適応形２線４線変換回路