JPS57201365A - Four-wire system branching and coupling circuit - Google Patents

Four-wire system branching and coupling circuit

Info

Publication number
JPS57201365A
JPS57201365A JP8617081A JP8617081A JPS57201365A JP S57201365 A JPS57201365 A JP S57201365A JP 8617081 A JP8617081 A JP 8617081A JP 8617081 A JP8617081 A JP 8617081A JP S57201365 A JPS57201365 A JP S57201365A
Authority
JP
Japan
Prior art keywords
echo
reference signal
input
circuit
wire
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
JP8617081A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6328390B2 (enrdf_load_stackoverflow
Inventor
Senji Furuya
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 JP8617081A priority Critical patent/JPS57201365A/ja
Publication of JPS57201365A publication Critical patent/JPS57201365A/ja
Publication of JPS6328390B2 publication Critical patent/JPS6328390B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/002—Applications of echo suppressors or cancellers in telephonic connections

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
JP8617081A 1981-06-03 1981-06-03 Four-wire system branching and coupling circuit Granted JPS57201365A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8617081A JPS57201365A (en) 1981-06-03 1981-06-03 Four-wire system branching and coupling circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8617081A JPS57201365A (en) 1981-06-03 1981-06-03 Four-wire system branching and coupling circuit

Publications (2)

Publication Number Publication Date
JPS57201365A true JPS57201365A (en) 1982-12-09
JPS6328390B2 JPS6328390B2 (enrdf_load_stackoverflow) 1988-06-08

Family

ID=13879277

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8617081A Granted JPS57201365A (en) 1981-06-03 1981-06-03 Four-wire system branching and coupling circuit

Country Status (1)

Country Link
JP (1) JPS57201365A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59219058A (ja) * 1983-05-27 1984-12-10 Toshiba Corp 拡声電話機用交換機
JPS60226262A (ja) * 1984-04-25 1985-11-11 Fujitsu Ltd 会議電話呼出制御方式
JPS6318752A (ja) * 1986-07-10 1988-01-26 Toshiba Corp 電子会議システムの音声入力装置
JPH07183835A (ja) * 1993-12-22 1995-07-21 Nec Corp 会議用エコーキャンセラー装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59219058A (ja) * 1983-05-27 1984-12-10 Toshiba Corp 拡声電話機用交換機
JPS60226262A (ja) * 1984-04-25 1985-11-11 Fujitsu Ltd 会議電話呼出制御方式
JPS6318752A (ja) * 1986-07-10 1988-01-26 Toshiba Corp 電子会議システムの音声入力装置
JPH07183835A (ja) * 1993-12-22 1995-07-21 Nec Corp 会議用エコーキャンセラー装置

Also Published As

Publication number Publication date
JPS6328390B2 (enrdf_load_stackoverflow) 1988-06-08

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