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ES491359A0 - Perfeccionamientos en los circuitos interfase para teclados electronicos de aparatos telefonicos - Google Patents

Perfeccionamientos en los circuitos interfase para teclados electronicos de aparatos telefonicos

Info

Publication number
ES491359A0
ES491359A0 ES491359A ES491359A ES491359A0 ES 491359 A0 ES491359 A0 ES 491359A0 ES 491359 A ES491359 A ES 491359A ES 491359 A ES491359 A ES 491359A ES 491359 A0 ES491359 A0 ES 491359A0
Authority
ES
Spain
Prior art keywords
interface circuits
telephone devices
electronic keypads
keypads
electronic
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
ES491359A
Other languages
English (en)
Other versions
ES8103623A1 (es
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.)
Italtel SpA
Original Assignee
Societa Italiana Telecomunicazioni Siemens SpA
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 Societa Italiana Telecomunicazioni Siemens SpA filed Critical Societa Italiana Telecomunicazioni Siemens SpA
Publication of ES8103623A1 publication Critical patent/ES8103623A1/es
Publication of ES491359A0 publication Critical patent/ES491359A0/es
Granted 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
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
ES491359A 1979-06-05 1980-05-09 Perfeccionamientos en los circuitos interfase para teclados electronicos de aparatos telefonicos Granted ES491359A0 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT7923279A IT1202931B (it) 1979-06-05 1979-06-05 Circuito di interfaccia per tastiera elettronica con ripetizione della selezione

Publications (2)

Publication Number Publication Date
ES8103623A1 ES8103623A1 (es) 1981-03-16
ES491359A0 true ES491359A0 (es) 1981-03-16

Family

ID=11205590

Family Applications (1)

Application Number Title Priority Date Filing Date
ES491359A Granted ES491359A0 (es) 1979-06-05 1980-05-09 Perfeccionamientos en los circuitos interfase para teclados electronicos de aparatos telefonicos

Country Status (10)

Country Link
US (1) US4329546A (es)
JP (1) JPS55165057A (es)
AR (1) AR223876A1 (es)
BR (1) BR8003169A (es)
DE (1) DE3021456A1 (es)
ES (1) ES491359A0 (es)
FR (1) FR2458962A1 (es)
GB (1) GB2055022A (es)
IT (1) IT1202931B (es)
SE (1) SE8003907L (es)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8001136A (nl) * 1980-02-26 1981-09-16 Philips Nv Schakeling voor toepassing in een telefoontoestel.
US4413159A (en) * 1982-04-02 1983-11-01 Bell Telephone Laboratories, Incorporated Dial pulsing circuit
US4492822A (en) * 1982-09-30 1985-01-08 Alderman Robert J Telephone hold circuit with improved self-limiting amplifier for injecting an audio signal during hold conditions
DE3334988A1 (de) * 1983-09-24 1985-04-18 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Schaltungsanordnung zur speisung von fernsprecheinrichtungen aus der leitung
US4555597A (en) * 1983-12-05 1985-11-26 Gte Business Communication Systems Inc. Transient resistant key operated pulse generating calling device circuit
FR2558024B1 (fr) * 1984-01-11 1986-05-16 Horlogerie Photograph Fse Clavier de numerotation telephonique protege contre les surcharges
US4634814A (en) * 1985-02-04 1987-01-06 Gte Communication Systems Corp. Surge protected electronic switch for telephone voiceband circuits
DE3538088C2 (de) * 1985-10-25 1993-11-11 Siemens Ag Schaltungsanordnung für einen Überspannungsschutz in elektronischen Fernsprechstationen
EP0593115A3 (en) * 1992-10-14 1999-02-17 Koninklijke Philips Electronics N.V. Electronic hook switch for a subscriber set
WO2020132440A1 (en) * 2018-12-21 2020-06-25 G.W. Lisk Company, Inc. Intrinsically safe circuitry

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2453730A1 (de) * 1972-08-03 1976-05-20 Itt Ind Gmbh Deutsche Verfahren und schaltungsanordnung zum ueberspannungsschutz von transistoren von betriebsschaltungen eines telefonapparates
US3956596A (en) * 1973-04-10 1976-05-11 The General Electric Company Limited Circuit arrangements in telephone apparatus
GB1515503A (en) * 1974-01-15 1978-06-28 Gen Electric Co Ltd Electric impulse transmitters for telephone instruments
SE386341B (sv) * 1974-03-29 1976-08-02 Ericsson Telefon Ab L M Kopplingsanordning vid en telefonapparat innefattande en likspenningsomvandlare.
US4008379A (en) * 1975-02-14 1977-02-15 San/Bar Corporation Touch-pad to dial conversion unit

Also Published As

Publication number Publication date
ES8103623A1 (es) 1981-03-16
FR2458962A1 (fr) 1981-01-02
SE8003907L (sv) 1980-12-06
JPS55165057A (en) 1980-12-23
IT7923279A0 (it) 1979-06-05
IT1202931B (it) 1989-02-15
AR223876A1 (es) 1981-09-30
BR8003169A (pt) 1980-12-30
US4329546A (en) 1982-05-11
DE3021456A1 (de) 1980-12-18
GB2055022A (en) 1981-02-18

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