JPS55165057A - Electronic keyboard interface circuit for telephone - Google Patents

Electronic keyboard interface circuit for telephone

Info

Publication number
JPS55165057A
JPS55165057A JP7442180A JP7442180A JPS55165057A JP S55165057 A JPS55165057 A JP S55165057A JP 7442180 A JP7442180 A JP 7442180A JP 7442180 A JP7442180 A JP 7442180A JP S55165057 A JPS55165057 A JP S55165057A
Authority
JP
Japan
Prior art keywords
telephone
interface circuit
keyboard interface
electronic keyboard
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.)
Pending
Application number
JP7442180A
Other languages
English (en)
Inventor
Monteshi Buitsutorio
Beshi Mario
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 JPS55165057A publication Critical patent/JPS55165057A/ja
Pending 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)
JP7442180A 1979-06-05 1980-06-04 Electronic keyboard interface circuit for telephone Pending JPS55165057A (en)

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 (1)

Publication Number Publication Date
JPS55165057A true JPS55165057A (en) 1980-12-23

Family

ID=11205590

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7442180A Pending JPS55165057A (en) 1979-06-05 1980-06-04 Electronic keyboard interface circuit for telephone

Country Status (10)

Country Link
US (1) US4329546A (ja)
JP (1) JPS55165057A (ja)
AR (1) AR223876A1 (ja)
BR (1) BR8003169A (ja)
DE (1) DE3021456A1 (ja)
ES (1) ES8103623A1 (ja)
FR (1) FR2458962A1 (ja)
GB (1) GB2055022A (ja)
IT (1) IT1202931B (ja)
SE (1) SE8003907L (ja)

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
DK3853959T3 (da) * 2018-12-21 2024-04-22 Lisk Co G W Kredsløb, der er sikkert i sig selv

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
US4329546A (en) 1982-05-11
IT7923279A0 (it) 1979-06-05
IT1202931B (it) 1989-02-15
GB2055022A (en) 1981-02-18
SE8003907L (sv) 1980-12-06
ES491359A0 (es) 1981-03-16
AR223876A1 (es) 1981-09-30
FR2458962A1 (fr) 1981-01-02
ES8103623A1 (es) 1981-03-16
DE3021456A1 (de) 1980-12-18
BR8003169A (pt) 1980-12-30

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