NL7212067A - - Google Patents

Info

Publication number
NL7212067A
NL7212067A NL7212067A NL7212067A NL7212067A NL 7212067 A NL7212067 A NL 7212067A NL 7212067 A NL7212067 A NL 7212067A NL 7212067 A NL7212067 A NL 7212067A NL 7212067 A NL7212067 A NL 7212067A
Authority
NL
Netherlands
Application number
NL7212067A
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 filed Critical
Publication of NL7212067A publication Critical patent/NL7212067A/xx

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)
  • Push-Button Switches (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Electronic Switches (AREA)
  • Telephonic Communication Services (AREA)
NL7212067A 1971-09-07 1972-09-05 NL7212067A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17812671A 1971-09-07 1971-09-07

Publications (1)

Publication Number Publication Date
NL7212067A true NL7212067A (fr) 1973-03-09

Family

ID=22651310

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7212067A NL7212067A (fr) 1971-09-07 1972-09-05

Country Status (10)

Country Link
US (1) US3699477A (fr)
JP (1) JPS5228522B2 (fr)
BE (1) BE788462A (fr)
CA (1) CA958083A (fr)
DE (1) DE2243625C3 (fr)
ES (1) ES406799A1 (fr)
FR (1) FR2152669B1 (fr)
GB (1) GB1411418A (fr)
IT (1) IT965227B (fr)
NL (1) NL7212067A (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7212510A (fr) * 1972-09-15 1974-03-19
CA988175A (en) * 1974-06-14 1976-04-27 Michael C.J. Cowpland Tone generator
US4110568A (en) * 1976-10-08 1978-08-29 Gte Atea, S.A. Dual tone multifrequency generator
JPS5461804A (en) * 1977-10-26 1979-05-18 Mitsubishi Electric Corp Information transmitter
US6326853B1 (en) * 1999-08-26 2001-12-04 Cypress Semiconductor Corp Circuitry, architecture and method(s) for phase matching and/or reducing load capacitance, current and/or power consumption in an oscillator
US8605889B2 (en) * 2011-11-18 2013-12-10 Edward D. REGAN Method and device for encoding characters and routing calls using expanded dual-tone multi-frequency (DTMF) encoding scheme

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3349350A (en) * 1964-12-04 1967-10-24 Otto E Rittenbach Frequency step filter
US3424870A (en) * 1965-09-14 1969-01-28 Bell Telephone Labor Inc Multifrequency signal generator for tone-dialed telephones

Also Published As

Publication number Publication date
CA958083A (en) 1974-11-19
DE2243625A1 (de) 1973-03-15
GB1411418A (en) 1975-10-22
ES406799A1 (es) 1975-10-16
JPS4837005A (fr) 1973-05-31
BE788462A (fr) 1973-01-02
DE2243625B2 (de) 1974-08-29
JPS5228522B2 (fr) 1977-07-27
US3699477A (en) 1972-10-17
DE2243625C3 (de) 1975-04-17
IT965227B (it) 1974-01-31
FR2152669A1 (fr) 1973-04-27
FR2152669B1 (fr) 1976-03-12

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Legal Events

Date Code Title Description
BC A request for examination has been filed
BV The patent application has lapsed