JPS5737965A - Two-terminal circuit - Google Patents

Two-terminal circuit

Info

Publication number
JPS5737965A
JPS5737965A JP11243280A JP11243280A JPS5737965A JP S5737965 A JPS5737965 A JP S5737965A JP 11243280 A JP11243280 A JP 11243280A JP 11243280 A JP11243280 A JP 11243280A JP S5737965 A JPS5737965 A JP S5737965A
Authority
JP
Japan
Prior art keywords
circuit
current
terminal
resistance value
flowing
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
JP11243280A
Other languages
Japanese (ja)
Other versions
JPS6324348B2 (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 JP11243280A priority Critical patent/JPS5737965A/en
Publication of JPS5737965A publication Critical patent/JPS5737965A/en
Publication of JPS6324348B2 publication Critical patent/JPS6324348B2/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
    • H04M1/76—Compensating for differences in line impedance

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Networks Using Active Elements (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To obtain small-sized two-terminal circuits which are easily integrated, by installing a constant-current circuit which is connected to DC supplying circuit in parallel and whose output current is controlled in accordance with the output of an amplifier. CONSTITUTION:When a DC voltage applied to a two-terminal circuit from the first and the second DC supplying circuits 105 and 107 is designates as E, an input rsistance of a current detecting circuit 301 is set to a value which is sufficiency small as compared with the resistance value R of a resistor 300, and the flow of the DC to a constant-current circuit 303 is interfered by a high-pass filter 302, the resistance value of the two-terminal circuit is identical with the resistance value R. On the other hand, the AC(i) flowing through the tow-terminal circuit by a voice signal (es) applied between terminals 104 and 106 by the telephone set is composed of a current (i1) flowing through the resistance value (R) connected to the terminal 104 and another current (i2) flowing through a constant-current circuit 303 composed of a high-pass filter 302 connected to the terminal 106. Therefore, by setting the impedance value R/(1+K) of the voice signal to 600OMEGA within the country, the circuit is reduced in size and can be integrated.
JP11243280A 1980-08-15 1980-08-15 Two-terminal circuit Granted JPS5737965A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11243280A JPS5737965A (en) 1980-08-15 1980-08-15 Two-terminal circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11243280A JPS5737965A (en) 1980-08-15 1980-08-15 Two-terminal circuit

Publications (2)

Publication Number Publication Date
JPS5737965A true JPS5737965A (en) 1982-03-02
JPS6324348B2 JPS6324348B2 (en) 1988-05-20

Family

ID=14586486

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11243280A Granted JPS5737965A (en) 1980-08-15 1980-08-15 Two-terminal circuit

Country Status (1)

Country Link
JP (1) JPS5737965A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4789999A (en) * 1984-07-30 1988-12-06 Alcatel N.V. Line circuit for coupling a subscriber set to a switching facility to provide a complex impedance match

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54132251U (en) * 1978-03-03 1979-09-13

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54132251U (en) * 1978-03-03 1979-09-13

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4789999A (en) * 1984-07-30 1988-12-06 Alcatel N.V. Line circuit for coupling a subscriber set to a switching facility to provide a complex impedance match

Also Published As

Publication number Publication date
JPS6324348B2 (en) 1988-05-20

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