JPS5537046A - Subscriber's circuit - Google Patents

Subscriber's circuit

Info

Publication number
JPS5537046A
JPS5537046A JP11012478A JP11012478A JPS5537046A JP S5537046 A JPS5537046 A JP S5537046A JP 11012478 A JP11012478 A JP 11012478A JP 11012478 A JP11012478 A JP 11012478A JP S5537046 A JPS5537046 A JP S5537046A
Authority
JP
Japan
Prior art keywords
terminal
ground
sound signal
subscriber
line
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
JP11012478A
Other languages
Japanese (ja)
Other versions
JPS628997B2 (en
Inventor
Kunio Nagashima
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 JP11012478A priority Critical patent/JPS5537046A/en
Publication of JPS5537046A publication Critical patent/JPS5537046A/en
Publication of JPS628997B2 publication Critical patent/JPS628997B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/005—Interface circuits for subscriber lines

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To facilitate IC implementation by carrying out the conversion of two line into four line by the adding and detracting through the operation amplifier. CONSTITUTION:The sound signal in the form of balancing to the ground, added to the first terminal 200 and the second terminal 201 connected to the subscriber's line is converted into the sound signal ln unbalance to the ground by the differential amplifier 202 and thereafter passing through the direct current checking capacitor 203 and the subtraction circuit 206, and transmitted to the conversion circuit connected to the fourth terminal 205. The sound signal in unbalance to the ground, added to the third terminal 204 from the switching circuit is converted into the sound signal in balance to the ground by the non reversing amplifier 207 and the reversing amplifier 209, and thereafter transmitted to the subscriber connected to the terminal 201.
JP11012478A 1978-09-06 1978-09-06 Subscriber's circuit Granted JPS5537046A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11012478A JPS5537046A (en) 1978-09-06 1978-09-06 Subscriber's circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11012478A JPS5537046A (en) 1978-09-06 1978-09-06 Subscriber's circuit

Publications (2)

Publication Number Publication Date
JPS5537046A true JPS5537046A (en) 1980-03-14
JPS628997B2 JPS628997B2 (en) 1987-02-25

Family

ID=14527626

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11012478A Granted JPS5537046A (en) 1978-09-06 1978-09-06 Subscriber's circuit

Country Status (1)

Country Link
JP (1) JPS5537046A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5742263A (en) * 1980-08-27 1982-03-09 Fujitsu Ltd Power feeding and two/four wire conversion system
JPS57188173A (en) * 1981-05-15 1982-11-19 Nec Corp Current supply circuit
US4375015A (en) * 1979-06-04 1983-02-22 Tellabs, Inc. Improved electronic hybrid circuit
US5655009A (en) * 1992-03-19 1997-08-05 Fujitsu Limited Modem unit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5332605A (en) * 1976-09-03 1978-03-28 Thomson Csf Telephone line circuit
JPS5376605A (en) * 1976-12-17 1978-07-07 Jeumont Schneider Telephone exchange subscriber line device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5332605A (en) * 1976-09-03 1978-03-28 Thomson Csf Telephone line circuit
JPS5376605A (en) * 1976-12-17 1978-07-07 Jeumont Schneider Telephone exchange subscriber line device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4375015A (en) * 1979-06-04 1983-02-22 Tellabs, Inc. Improved electronic hybrid circuit
JPS5742263A (en) * 1980-08-27 1982-03-09 Fujitsu Ltd Power feeding and two/four wire conversion system
JPS6230546B2 (en) * 1980-08-27 1987-07-02 Fujitsu Ltd
JPS57188173A (en) * 1981-05-15 1982-11-19 Nec Corp Current supply circuit
JPS6322666B2 (en) * 1981-05-15 1988-05-12 Nippon Electric Co
US5655009A (en) * 1992-03-19 1997-08-05 Fujitsu Limited Modem unit

Also Published As

Publication number Publication date
JPS628997B2 (en) 1987-02-25

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