JPS5099203A - - Google Patents

Info

Publication number
JPS5099203A
JPS5099203A JP49001490A JP149074A JPS5099203A JP S5099203 A JPS5099203 A JP S5099203A JP 49001490 A JP49001490 A JP 49001490A JP 149074 A JP149074 A JP 149074A JP S5099203 A JPS5099203 A JP S5099203A
Authority
JP
Japan
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
JP49001490A
Other versions
JPS531123B2 (ja
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 filed Critical
Priority to JP741490A priority Critical patent/JPS531123B2/ja
Priority to US05/533,801 priority patent/US3969591A/en
Priority to BR10882/74A priority patent/BR7410882D0/pt
Publication of JPS5099203A publication Critical patent/JPS5099203A/ja
Publication of JPS531123B2 publication Critical patent/JPS531123B2/ja
Expired 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
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/667—Preventing unauthorised calls from a telephone set
    • H04M1/67—Preventing unauthorised calls from a telephone set by electronic means

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephone Set Structure (AREA)
JP741490A 1973-12-28 1973-12-28 Expired JPS531123B2 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP741490A JPS531123B2 (ja) 1973-12-28 1973-12-28
US05/533,801 US3969591A (en) 1973-12-28 1974-12-18 Circuit for preventing impulse generation by operating a hook switch in a telephone set
BR10882/74A BR7410882D0 (pt) 1973-12-28 1974-12-27 Circuito para prevenir a geracao de pulsos provocada pela operacao de um interruptor de gancho em um conjunto de telefone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP741490A JPS531123B2 (ja) 1973-12-28 1973-12-28

Publications (2)

Publication Number Publication Date
JPS5099203A true JPS5099203A (ja) 1975-08-06
JPS531123B2 JPS531123B2 (ja) 1978-01-14

Family

ID=11502879

Family Applications (1)

Application Number Title Priority Date Filing Date
JP741490A Expired JPS531123B2 (ja) 1973-12-28 1973-12-28

Country Status (3)

Country Link
US (1) US3969591A (ja)
JP (1) JPS531123B2 (ja)
BR (1) BR7410882D0 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS548904A (en) * 1977-06-22 1979-01-23 Nec Corp Hooking control circuit

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL174420C (nl) * 1975-06-30 1984-06-01 Philips Nv Beveiligingsinrichting voor een telefoontoestel.
FR2373927A1 (fr) * 1976-12-10 1978-07-07 Trt Telecom Radio Electr Reseau electrique destine a etre insere par une paire de bornes dans une boucle d'abonne telephonique
US5859906A (en) * 1996-11-19 1999-01-12 Thomson Consumer Electronics, Inc. Telephone switch hook interface circuit
EP0876724B1 (en) * 1995-12-22 2003-06-11 Thomson Consumer Electronics, Inc. A telephone switch hook interface circuit
EP1128654B1 (en) * 2000-02-22 2006-09-20 STMicroelectronics S.r.l. A telephone

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3471650A (en) * 1966-02-07 1969-10-07 Superior Continental Corp Telephone signaling system for rejecting spurious ringing signals
US3525819A (en) * 1968-04-09 1970-08-25 Bell Telephone Labor Inc Electronic common switch for a telephone set

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS548904A (en) * 1977-06-22 1979-01-23 Nec Corp Hooking control circuit

Also Published As

Publication number Publication date
BR7410882D0 (pt) 1975-09-02
US3969591A (en) 1976-07-13
JPS531123B2 (ja) 1978-01-14

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