IT972553B - Generatore di frequenze per sele zione a tastiera particolarmente per apparecchi telefonici - Google Patents

Generatore di frequenze per sele zione a tastiera particolarmente per apparecchi telefonici

Info

Publication number
IT972553B
IT972553B IT33159/72A IT3315972A IT972553B IT 972553 B IT972553 B IT 972553B IT 33159/72 A IT33159/72 A IT 33159/72A IT 3315972 A IT3315972 A IT 3315972A IT 972553 B IT972553 B IT 972553B
Authority
IT
Italy
Prior art keywords
frequency generator
telephone devices
keypad selection
selection particularly
keypad
Prior art date
Application number
IT33159/72A
Other languages
English (en)
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
Application granted granted Critical
Publication of IT972553B publication Critical patent/IT972553B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Amplifiers (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
IT33159/72A 1972-02-11 1972-12-19 Generatore di frequenze per sele zione a tastiera particolarmente per apparecchi telefonici IT972553B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US22544072A 1972-02-11 1972-02-11

Publications (1)

Publication Number Publication Date
IT972553B true IT972553B (it) 1974-05-31

Family

ID=22844876

Family Applications (1)

Application Number Title Priority Date Filing Date
IT33159/72A IT972553B (it) 1972-02-11 1972-12-19 Generatore di frequenze per sele zione a tastiera particolarmente per apparecchi telefonici

Country Status (6)

Country Link
US (1) US3761642A (it)
BE (1) BE795179A (it)
CA (1) CA969688A (it)
DE (1) DE2301326A1 (it)
GB (1) GB1379333A (it)
IT (1) IT972553B (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2286564A1 (fr) * 1974-09-30 1976-04-23 Roche Bernard Dispositif synthetiseur de signaux a multifrequences

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3424870A (en) * 1965-09-14 1969-01-28 Bell Telephone Labor Inc Multifrequency signal generator for tone-dialed telephones
US3521005A (en) * 1966-09-01 1970-07-21 Bell Telephone Labor Inc Multifrequency signal generator
US3617646A (en) * 1969-07-22 1971-11-02 Bell Telephone Labor Inc Multifrequency oscillator employing solid-state device switching for frequency selection
US3612773A (en) * 1969-07-22 1971-10-12 Bell Telephone Labor Inc Electronic frequency switching circuit for multifrequency signal generator

Also Published As

Publication number Publication date
CA969688A (en) 1975-06-17
BE795179A (fr) 1973-08-09
US3761642A (en) 1973-09-25
GB1379333A (en) 1975-01-02
DE2301326A1 (de) 1973-09-20

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