IT7921202A0 - Apparecchio e procedimento per farfunzionare un impianto ditrasmissione di codice a piu'frequenze foniche per l'inizio di chiamate telefoniche. - Google Patents

Apparecchio e procedimento per farfunzionare un impianto ditrasmissione di codice a piu'frequenze foniche per l'inizio di chiamate telefoniche.

Info

Publication number
IT7921202A0
IT7921202A0 IT7921202A IT2120279A IT7921202A0 IT 7921202 A0 IT7921202 A0 IT 7921202A0 IT 7921202 A IT7921202 A IT 7921202A IT 2120279 A IT2120279 A IT 2120279A IT 7921202 A0 IT7921202 A0 IT 7921202A0
Authority
IT
Italy
Prior art keywords
frequensies
initiation
code
procedure
transmission
Prior art date
Application number
IT7921202A
Other languages
English (en)
Other versions
IT1112398B (it
Original Assignee
Gte Automatic Electric Lab Inc
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 Gte Automatic Electric Lab Inc filed Critical Gte Automatic Electric Lab Inc
Publication of IT7921202A0 publication Critical patent/IT7921202A0/it
Application granted granted Critical
Publication of IT1112398B publication Critical patent/IT1112398B/it

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
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • H04M1/505—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies signals generated in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Telephone Function (AREA)
IT21202/79A 1978-03-30 1979-03-22 Apparecchio e procedimento per far funzionare un impianto di trasmissione di codice a piu' frequenze foniche per l'inizio di chiamate telefoniche IT1112398B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/891,883 US4156115A (en) 1978-03-30 1978-03-30 Apparatus and method for a multiple tone code sender system for automatic call initiation

Publications (2)

Publication Number Publication Date
IT7921202A0 true IT7921202A0 (it) 1979-03-22
IT1112398B IT1112398B (it) 1986-01-13

Family

ID=25398988

Family Applications (1)

Application Number Title Priority Date Filing Date
IT21202/79A IT1112398B (it) 1978-03-30 1979-03-22 Apparecchio e procedimento per far funzionare un impianto di trasmissione di codice a piu' frequenze foniche per l'inizio di chiamate telefoniche

Country Status (4)

Country Link
US (1) US4156115A (it)
BE (1) BE872074A (it)
CA (1) CA1107420A (it)
IT (1) IT1112398B (it)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4336529A (en) * 1980-02-19 1982-06-22 Pitney Bowes Inc. Postage meter having shielded keyboard to protect against electromagnetic radiation
JPH01311745A (ja) * 1988-06-10 1989-12-15 Fujitsu Ltd ダイヤル信号送出装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3719897A (en) * 1971-11-26 1973-03-06 Gte Automatic Electric Lab Inc Digital tone generator

Also Published As

Publication number Publication date
BE872074A (fr) 1979-03-16
CA1107420A (en) 1981-08-18
IT1112398B (it) 1986-01-13
US4156115A (en) 1979-05-22

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