NO126762B - - Google Patents

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Publication number
NO126762B
NO126762B NO02184/70A NO218470A NO126762B NO 126762 B NO126762 B NO 126762B NO 02184/70 A NO02184/70 A NO 02184/70A NO 218470 A NO218470 A NO 218470A NO 126762 B NO126762 B NO 126762B
Authority
NO
Norway
Prior art keywords
tone
frequency
circuit
oscillator
telephone
Prior art date
Application number
NO02184/70A
Other languages
English (en)
Norwegian (no)
Inventor
Herman Josef Burghardt Vollmer
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of NO126762B publication Critical patent/NO126762B/no

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Telephonic Communication Services (AREA)
NO02184/70A 1969-06-06 1970-06-04 NO126762B (xx)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE803369 1969-06-06

Publications (1)

Publication Number Publication Date
NO126762B true NO126762B (xx) 1973-03-19

Family

ID=20272951

Family Applications (1)

Application Number Title Priority Date Filing Date
NO02184/70A NO126762B (xx) 1969-06-06 1970-06-04

Country Status (8)

Country Link
US (1) US3665489A (xx)
CH (1) CH503446A (xx)
DE (1) DE2027508B2 (xx)
DK (1) DK124509B (xx)
FR (1) FR2050060A5 (xx)
GB (1) GB1277676A (xx)
NL (1) NL7008132A (xx)
NO (1) NO126762B (xx)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911223A (en) * 1971-12-02 1975-10-07 Siemens Ag Circuit arrangement for subscriber stations in telecommunications installations, especially telephone installations with auxiliary data traffic
NL7402574A (nl) * 1974-02-26 1975-08-28 Philips Nv Schakeling voor een toondruktoetskeuzetelefoon- toestel.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE510536A (xx) * 1951-04-10
NL236432A (xx) * 1958-03-10
NL242923A (xx) * 1958-09-08
DE1201417B (de) * 1964-07-10 1965-09-23 Standard Elektrik Lorenz Ag Tonfrequentes Tastwahlverfahren ohne Gleichstrom-Wahlbegleitzeichen in Fernmelde-, insbesondere Fernsprechanlagen und Schaltungsanordnung zur Durchfuehrung des Verfahrens
US3424870A (en) * 1965-09-14 1969-01-28 Bell Telephone Labor Inc Multifrequency signal generator for tone-dialed telephones
NL6604015A (xx) * 1966-03-26 1967-09-27
FR1525030A (fr) * 1966-07-29 1968-05-17 Cit Alcatel Disposition de clavier pour numérotation par variations d'impédance

Also Published As

Publication number Publication date
NL7008132A (xx) 1970-12-08
FR2050060A5 (xx) 1971-03-26
DE2027508A1 (xx) 1970-12-10
DK124509B (da) 1972-10-23
DE2027508B2 (de) 1972-03-30
US3665489A (en) 1972-05-23
GB1277676A (en) 1972-06-14
CH503446A (de) 1971-02-15

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