JPS5737966A - Compensating system for unbalance to earth - Google Patents

Compensating system for unbalance to earth

Info

Publication number
JPS5737966A
JPS5737966A JP11243480A JP11243480A JPS5737966A JP S5737966 A JPS5737966 A JP S5737966A JP 11243480 A JP11243480 A JP 11243480A JP 11243480 A JP11243480 A JP 11243480A JP S5737966 A JPS5737966 A JP S5737966A
Authority
JP
Japan
Prior art keywords
earth
controlling
unbalance
current
talking
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
JP11243480A
Other languages
Japanese (ja)
Other versions
JPS6210462B2 (en
Inventor
Toshihisa Yoshida
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 JP11243480A priority Critical patent/JPS5737966A/en
Publication of JPS5737966A publication Critical patent/JPS5737966A/en
Publication of JPS6210462B2 publication Critical patent/JPS6210462B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To automatically remove unbalance component to earth, by detecting and amplifying AC potential differences and controlling a talking current controlling element at a talking current supplying circuit of an electronic exchange. CONSTITUTION:The center point of resistance 100 and 101 inserted in series with a talking current supplying power source 107 is connected with the ground, and the potential difference across both ends of the resistances 101 and 101 is detected and amplified, and then, differences in the characteristics of transistors 108 and 111 are compensated by controlling the current value of the transistor for controlling the constant-current. Therefore, the unbalance to earth can be reduced.
JP11243480A 1980-08-15 1980-08-15 Compensating system for unbalance to earth Granted JPS5737966A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11243480A JPS5737966A (en) 1980-08-15 1980-08-15 Compensating system for unbalance to earth

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11243480A JPS5737966A (en) 1980-08-15 1980-08-15 Compensating system for unbalance to earth

Publications (2)

Publication Number Publication Date
JPS5737966A true JPS5737966A (en) 1982-03-02
JPS6210462B2 JPS6210462B2 (en) 1987-03-06

Family

ID=14586532

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11243480A Granted JPS5737966A (en) 1980-08-15 1980-08-15 Compensating system for unbalance to earth

Country Status (1)

Country Link
JP (1) JPS5737966A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4617426A (en) * 1982-07-06 1986-10-14 Telefonaktiebolaget Lm Ericsson Method for current supply to a subscriber telephone from a telephone exchange

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4617426A (en) * 1982-07-06 1986-10-14 Telefonaktiebolaget Lm Ericsson Method for current supply to a subscriber telephone from a telephone exchange

Also Published As

Publication number Publication date
JPS6210462B2 (en) 1987-03-06

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