JPS55134571A - Subscriber's circuit - Google Patents

Subscriber's circuit

Info

Publication number
JPS55134571A
JPS55134571A JP4140879A JP4140879A JPS55134571A JP S55134571 A JPS55134571 A JP S55134571A JP 4140879 A JP4140879 A JP 4140879A JP 4140879 A JP4140879 A JP 4140879A JP S55134571 A JPS55134571 A JP S55134571A
Authority
JP
Japan
Prior art keywords
circuit
amplifier
subscriber
signal
constitution
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
JP4140879A
Other languages
Japanese (ja)
Other versions
JPS6231543B2 (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 JP4140879A priority Critical patent/JPS55134571A/en
Publication of JPS55134571A publication Critical patent/JPS55134571A/en
Publication of JPS6231543B2 publication Critical patent/JPS6231543B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone

Landscapes

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

Abstract

PURPOSE:To obtain a miniature and lightweight subscriber's circuit which does not need large power for control, by employing the constitution of a differential amplifier, arithmetic circuit, in-phase amplifier, and inverting amplifier and by combining a hybrid circuit with a semiconductor switch for howler signals. CONSTITUTION:An audio signal, applied in the form of ground balancing between terminals 200 and 203, is inputted via capacitors 201 and 204 to differential amplifier 205, where it is converted into the form of ground unbalancing, and the conversion output is transmitted from terminal 207 to a converting circuit by way of adding circuit 208. An audio signal, applied from the converting circuit to terminal 206 is converted into the form of ground balancing through adding circuit 210 and inverting amplifier 212, and the conversion output is sent to a subscriber via a resistance. Although this signal is applied to circuit 208 via amplifier 205, part of the signal from terminal 206 is applied and canceled to prevent echoes, thereby constituting a hybrid circuit. The output of howler signal supply 213 is applied to the subscriber by way of switch element 214, circuit 210 and amplifier 212. Since the adder circuit and amplifier are high in input impedance, a little switch current only is required and semiconductors can be employed for constitution.
JP4140879A 1979-04-05 1979-04-05 Subscriber's circuit Granted JPS55134571A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4140879A JPS55134571A (en) 1979-04-05 1979-04-05 Subscriber's circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4140879A JPS55134571A (en) 1979-04-05 1979-04-05 Subscriber's circuit

Publications (2)

Publication Number Publication Date
JPS55134571A true JPS55134571A (en) 1980-10-20
JPS6231543B2 JPS6231543B2 (en) 1987-07-09

Family

ID=12607523

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4140879A Granted JPS55134571A (en) 1979-04-05 1979-04-05 Subscriber's circuit

Country Status (1)

Country Link
JP (1) JPS55134571A (en)

Also Published As

Publication number Publication date
JPS6231543B2 (en) 1987-07-09

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