DK141979B - Kobling til telefonapparater med tone-trykknapvalg. - Google Patents

Kobling til telefonapparater med tone-trykknapvalg. Download PDF

Info

Publication number
DK141979B
DK141979B DK67775AA DK67775A DK141979B DK 141979 B DK141979 B DK 141979B DK 67775A A DK67775A A DK 67775AA DK 67775 A DK67775 A DK 67775A DK 141979 B DK141979 B DK 141979B
Authority
DK
Denmark
Prior art keywords
circuit
tone
current
signals
signal
Prior art date
Application number
DK67775AA
Other languages
Danish (da)
English (en)
Other versions
DK67775A (xx
DK141979C (xx
Inventor
Petrie Johan Van Der Plaats
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Publication of DK67775A publication Critical patent/DK67775A/da
Publication of DK141979B publication Critical patent/DK141979B/da
Application granted granted Critical
Publication of DK141979C publication Critical patent/DK141979C/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)
  • Telephonic Communication Services (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Amplifiers (AREA)
  • Interface Circuits In Exchanges (AREA)
DK67775AA 1974-02-26 1975-02-21 Kobling til telefonapparater med tone-trykknapvalg. DK141979B (da)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7402574A NL7402574A (nl) 1974-02-26 1974-02-26 Schakeling voor een toondruktoetskeuzetelefoon- toestel.
NL7402574 1974-02-26

Publications (3)

Publication Number Publication Date
DK67775A DK67775A (xx) 1975-10-27
DK141979B true DK141979B (da) 1980-07-28
DK141979C DK141979C (xx) 1980-12-08

Family

ID=19820838

Family Applications (1)

Application Number Title Priority Date Filing Date
DK67775AA DK141979B (da) 1974-02-26 1975-02-21 Kobling til telefonapparater med tone-trykknapvalg.

Country Status (10)

Country Link
US (1) US3978295A (xx)
JP (1) JPS547644B2 (xx)
BE (1) BE825893A (xx)
CA (1) CA1015079A (xx)
DE (1) DE2505955C3 (xx)
DK (1) DK141979B (xx)
FR (1) FR2262457B1 (xx)
GB (1) GB1452254A (xx)
NL (1) NL7402574A (xx)
SE (1) SE399169B (xx)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196318A (en) * 1978-09-29 1980-04-01 Bell Telephone Laboratories, Incorporated Electronically-switched multifrequency generator for providing tone signaling
US4352958A (en) * 1979-12-13 1982-10-05 Bell Telephone Laboratories, Incorporated Electronically-switched multifrequency generator with transducer control
US4472601A (en) * 1982-07-14 1984-09-18 Rca Corporation Control circuit for telephone receiver and transmitter
US6529450B1 (en) * 1998-08-03 2003-03-04 Dictaphone Corporation Hand microphone interfaced to game controller port of personal computer

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL257471A (xx) * 1959-12-16 1900-01-01
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
BE693127A (xx) * 1967-01-25 1967-07-25
CA861632A (en) * 1969-03-19 1971-01-19 Northern Electric Company Limited Pushbutton dial telephone set
US3665489A (en) * 1969-06-06 1972-05-23 Ericsson Telefon Ab L M Telephone instrument for voice frequency choice of number

Also Published As

Publication number Publication date
SE7501942L (xx) 1975-08-27
DK67775A (xx) 1975-10-27
JPS50120506A (xx) 1975-09-20
DE2505955C3 (de) 1981-06-04
JPS547644B2 (xx) 1979-04-09
FR2262457A1 (xx) 1975-09-19
US3978295A (en) 1976-08-31
DK141979C (xx) 1980-12-08
DE2505955A1 (de) 1975-08-28
BE825893A (fr) 1975-08-25
NL7402574A (nl) 1975-08-28
CA1015079A (en) 1977-08-02
SE399169B (sv) 1978-01-30
DE2505955B2 (de) 1980-08-14
FR2262457B1 (xx) 1978-02-03
GB1452254A (en) 1976-10-13

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