DK124509B - Telefonapparat til tonefrekvent nummervalg. - Google Patents

Telefonapparat til tonefrekvent nummervalg.

Info

Publication number
DK124509B
DK124509B DK292170AA DK292170A DK124509B DK 124509 B DK124509 B DK 124509B DK 292170A A DK292170A A DK 292170AA DK 292170 A DK292170 A DK 292170A DK 124509 B DK124509 B DK 124509B
Authority
DK
Denmark
Prior art keywords
telephone set
tone frequency
frequency dialing
dialing
tone
Prior art date
Application number
DK292170AA
Other languages
English (en)
Inventor
H 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 DK124509B publication Critical patent/DK124509B/da

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)
DK292170AA 1969-06-06 1970-06-04 Telefonapparat til tonefrekvent nummervalg. DK124509B (da)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
DK124509B true DK124509B (da) 1972-10-23

Family

ID=20272951

Family Applications (1)

Application Number Title Priority Date Filing Date
DK292170AA DK124509B (da) 1969-06-06 1970-06-04 Telefonapparat til tonefrekvent nummervalg.

Country Status (8)

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

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 (da) * 1951-04-10
NL236432A (da) * 1958-03-10
NL242923A (da) * 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 (da) * 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
DE2027508A1 (da) 1970-12-10
US3665489A (en) 1972-05-23
NL7008132A (da) 1970-12-08
DE2027508B2 (de) 1972-03-30
CH503446A (de) 1971-02-15
FR2050060A5 (da) 1971-03-26
NO126762B (da) 1973-03-19
GB1277676A (en) 1972-06-14

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