JPS53143109A - Hooking detection circuit - Google Patents

Hooking detection circuit

Info

Publication number
JPS53143109A
JPS53143109A JP5764377A JP5764377A JPS53143109A JP S53143109 A JPS53143109 A JP S53143109A JP 5764377 A JP5764377 A JP 5764377A JP 5764377 A JP5764377 A JP 5764377A JP S53143109 A JPS53143109 A JP S53143109A
Authority
JP
Japan
Prior art keywords
detection circuit
hooking detection
hooking
judgement
call
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.)
Pending
Application number
JP5764377A
Other languages
English (en)
Inventor
Saburo Okuda
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5764377A priority Critical patent/JPS53143109A/ja
Publication of JPS53143109A publication Critical patent/JPS53143109A/ja
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
JP5764377A 1977-05-20 1977-05-20 Hooking detection circuit Pending JPS53143109A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5764377A JPS53143109A (en) 1977-05-20 1977-05-20 Hooking detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5764377A JPS53143109A (en) 1977-05-20 1977-05-20 Hooking detection circuit

Publications (1)

Publication Number Publication Date
JPS53143109A true JPS53143109A (en) 1978-12-13

Family

ID=13061563

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5764377A Pending JPS53143109A (en) 1977-05-20 1977-05-20 Hooking detection circuit

Country Status (1)

Country Link
JP (1) JPS53143109A (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5741369U (ja) * 1980-08-21 1982-03-05
JPS5839152A (ja) * 1981-09-02 1983-03-07 Nec Corp フツキングパルス検出方式
JPS58202689A (ja) * 1982-05-21 1983-11-25 Nec Corp 押しボタンダイヤル信号の検出方式

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5741369U (ja) * 1980-08-21 1982-03-05
JPS5839152A (ja) * 1981-09-02 1983-03-07 Nec Corp フツキングパルス検出方式
JPS58202689A (ja) * 1982-05-21 1983-11-25 Nec Corp 押しボタンダイヤル信号の検出方式

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