JPS53135504A - Dc component measuring device - Google Patents

Dc component measuring device

Info

Publication number
JPS53135504A
JPS53135504A JP2508478A JP2508478A JPS53135504A JP S53135504 A JPS53135504 A JP S53135504A JP 2508478 A JP2508478 A JP 2508478A JP 2508478 A JP2508478 A JP 2508478A JP S53135504 A JPS53135504 A JP S53135504A
Authority
JP
Japan
Prior art keywords
measuring device
component measuring
component
measuring
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
JP2508478A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6113423B2 (https=
Inventor
Shiyaooin Fuen Jiyosefu
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of JPS53135504A publication Critical patent/JPS53135504A/ja
Publication of JPS6113423B2 publication Critical patent/JPS6113423B2/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
    • H04M19/026—Arrangements for interrupting the ringing current

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
JP2508478A 1977-04-28 1978-03-07 Dc component measuring device Granted JPS53135504A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/792,079 US4132864A (en) 1977-04-28 1977-04-28 Digital measurement of the DC value in an AC signal adapted to telephone off-hook detection

Publications (2)

Publication Number Publication Date
JPS53135504A true JPS53135504A (en) 1978-11-27
JPS6113423B2 JPS6113423B2 (https=) 1986-04-14

Family

ID=25155731

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2508478A Granted JPS53135504A (en) 1977-04-28 1978-03-07 Dc component measuring device

Country Status (4)

Country Link
US (1) US4132864A (https=)
JP (1) JPS53135504A (https=)
CA (1) CA1081875A (https=)
DE (1) DE2816981A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58195353A (ja) * 1982-04-26 1983-11-14 アルカテル・エヌ・ブイ 電話システム用デジタル管理回路

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4211896A (en) * 1977-10-17 1980-07-08 Telecommunications Radioelectrique Et Telephoniques T.R.T. Subscriber's circuit with a symmetrical amplifier
US4447673A (en) * 1977-12-27 1984-05-08 Stromberg-Carlson Corporation Ring trip apparatus for a line circuit connected to DCO switch
DE3036686C2 (de) * 1980-09-29 1983-12-01 Siemens AG, 1000 Berlin und 8000 München Teilnehmeranschlußschaltung
US4363127A (en) * 1981-01-12 1982-12-07 Ford Aerospace & Communications Corporation Line signaling apparatus and techniques for digital data links
US4429185A (en) 1981-12-21 1984-01-31 Bell Telephone Laboratories, Incorporated Voltage detector circuit
IT1155661B (it) * 1982-03-24 1987-01-28 Cselt Centro Studi Lab Telecom Circuito elettronico per la rivelazione dello sgancio del microtelefono in presenza della corrente di chiamata
FR2531296B1 (fr) * 1982-07-30 1988-04-15 Cit Alcatel Procede et dispositif de detection de boucle en phase sonnerie
FR2553893B1 (fr) * 1983-10-19 1986-02-07 Texas Instruments France Procede et dispositif de detection d'une transition de la composante continue d'un signal periodique, notamment pour joncteur telephonique
US4958371A (en) * 1988-04-19 1990-09-18 Control Data Corporation Method and apparatus for determining when a telephone handset is off-hook
US5526420A (en) * 1990-08-03 1996-06-11 Canon Kabushiki Kaisha Communication apparatus
US5287404A (en) * 1990-12-20 1994-02-15 Northern Telecom Limited Telephone subscriber line voltage change detection
SE9400186D0 (sv) * 1994-01-21 1994-01-21 Ericsson Telefon Ab L M Förfarande i ett telekommunikationssystem
JP2000516358A (ja) 1995-12-22 2000-12-05 トムソン コンシユーマ エレクトロニクス インコーポレイテツド Ｉｒ受信器と電子機器との間の電気的絶縁装置
US5663878A (en) * 1996-03-21 1997-09-02 Unitrode Corporation Apparatus and method for generating a low frequency AC signal
SE511917C2 (sv) * 1996-12-10 1999-12-13 Ericsson Telefon Ab L M Förfarande för anordning för att detektera en ringbortkoppling
US6115469A (en) * 1998-08-25 2000-09-05 Unitrode Corporation Telephone line ring signal and DC power generator
CA2289383C (en) * 1999-11-12 2009-02-03 Martin Bijman A system and method for detecting an off-hook condition
US6376933B1 (en) 1999-12-31 2002-04-23 Honeywell International Inc. Magneto-resistive signal isolator
US6618473B1 (en) * 2001-07-06 2003-09-09 Dasym Technologies, Inc. Telephone caller screening device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735263A (en) * 1972-07-12 1973-05-22 Northeast Electronics Corp Digital analysis of electric wave signals
US3851108A (en) * 1972-12-20 1974-11-26 Bell Lab Inc Communication line supervisory circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58195353A (ja) * 1982-04-26 1983-11-14 アルカテル・エヌ・ブイ 電話システム用デジタル管理回路

Also Published As

Publication number Publication date
JPS6113423B2 (https=) 1986-04-14
DE2816981A1 (de) 1978-11-02
US4132864A (en) 1979-01-02
CA1081875A (en) 1980-07-15

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