BR7410882D0 - Circuito para prevenir a geracao de pulsos provocada pela operacao de um interruptor de gancho em um conjunto de telefone - Google Patents

Circuito para prevenir a geracao de pulsos provocada pela operacao de um interruptor de gancho em um conjunto de telefone

Info

Publication number
BR7410882D0
BR7410882D0 BR10882/74A BR1088274A BR7410882D0 BR 7410882 D0 BR7410882 D0 BR 7410882D0 BR 10882/74 A BR10882/74 A BR 10882/74A BR 1088274 A BR1088274 A BR 1088274A BR 7410882 D0 BR7410882 D0 BR 7410882D0
Authority
BR
Brazil
Prior art keywords
operating
circuit
pulse generation
telephone set
hook switch
Prior art date
Application number
BR10882/74A
Other languages
English (en)
Portuguese (pt)
Inventor
K Sekiguchi
Original Assignee
Iwatsu 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Publication of BR7410882D0 publication Critical patent/BR7410882D0/pt

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)
BR10882/74A 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 BR7410882D0 (pt)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
BR7410882D0 true BR7410882D0 (pt) 1975-09-02

Family

ID=11502879

Family Applications (1)

Application Number Title Priority Date Filing Date
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

Country Status (3)

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

Families Citing this family (6)

* 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
JPS548904A (en) * 1977-06-22 1979-01-23 Nec Corp Hooking control circuit
WO1997023984A1 (en) * 1995-12-22 1997-07-03 Thomson Consumer Electronics, Inc. A telephone switch hook interface circuit
US5859906A (en) * 1996-11-19 1999-01-12 Thomson Consumer Electronics, Inc. Telephone switch hook interface circuit
DE60030836D1 (de) * 2000-02-22 2006-11-02 St Microelectronics Srl Telephon

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

Also Published As

Publication number Publication date
JPS531123B2 (enExample) 1978-01-14
US3969591A (en) 1976-07-13
JPS5099203A (enExample) 1975-08-06

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