JPS57184361A - Subscriber circuit - Google Patents

Subscriber circuit

Info

Publication number
JPS57184361A
JPS57184361A JP6902181A JP6902181A JPS57184361A JP S57184361 A JPS57184361 A JP S57184361A JP 6902181 A JP6902181 A JP 6902181A JP 6902181 A JP6902181 A JP 6902181A JP S57184361 A JPS57184361 A JP S57184361A
Authority
JP
Japan
Prior art keywords
circuit
transformer
resistor
output
amplifier
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
JP6902181A
Other languages
Japanese (ja)
Other versions
JPH0255983B2 (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 JP6902181A priority Critical patent/JPS57184361A/en
Publication of JPS57184361A publication Critical patent/JPS57184361A/en
Publication of JPH0255983B2 publication Critical patent/JPH0255983B2/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
    • H04M1/82—Line monitoring circuits for call progress or status discrimination

Abstract

PURPOSE:To realize the miniaturization, light weight and integration in a simple way and at the same time to reduce the power consumption, by constituting a current detecting circuit with a resistor, an amplifier, a transformer, a switch element, a rectifier and an LPF respectively. CONSTITUTION:A current detecting circuit consists of a resistor 300, an amplifier 301, a transformer 306, a switch element 303, a rectifying circuit 307 and an LPF308. An end of the resistor 300 is connected to a winding 202 with the other end connected to a terminal 209. An end of the switch element 303 is connected to the output of the amplifier 301 having the input connected to the other end of the resistor 300, and performs the switching control by the output of an oscillator 302. The transformer 306 consists of the 1st and 2nd windings 304 and 305 having an end connected to the other end of the element 303 and the other end connected to an end of the winding 202 respectively. The circuit 307 connects an input to the winding 305 of the transformer 306. The LPF306 connects the input and the output to the output of the circuit 307 and the terminal 210 respectively. In such a way, the miniaturization, light weight and integration can be facilitated for a subscriber circuit with a reduction of the power consumption.
JP6902181A 1981-05-08 1981-05-08 Subscriber circuit Granted JPS57184361A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6902181A JPS57184361A (en) 1981-05-08 1981-05-08 Subscriber circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6902181A JPS57184361A (en) 1981-05-08 1981-05-08 Subscriber circuit

Publications (2)

Publication Number Publication Date
JPS57184361A true JPS57184361A (en) 1982-11-13
JPH0255983B2 JPH0255983B2 (en) 1990-11-28

Family

ID=13390506

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6902181A Granted JPS57184361A (en) 1981-05-08 1981-05-08 Subscriber circuit

Country Status (1)

Country Link
JP (1) JPS57184361A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6196862A (en) * 1984-10-15 1986-05-15 アルカテル・エヌ・ブイ Pre-circuit device for subscriber
US4939696A (en) * 1987-08-28 1990-07-03 Hitachi, Ltd. Semiconductor memory device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6196862A (en) * 1984-10-15 1986-05-15 アルカテル・エヌ・ブイ Pre-circuit device for subscriber
US4939696A (en) * 1987-08-28 1990-07-03 Hitachi, Ltd. Semiconductor memory device

Also Published As

Publication number Publication date
JPH0255983B2 (en) 1990-11-28

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