SE7607775L - Knappsatstelefon - Google Patents

Knappsatstelefon

Info

Publication number
SE7607775L
SE7607775L SE7607775A SE7607775A SE7607775L SE 7607775 L SE7607775 L SE 7607775L SE 7607775 A SE7607775 A SE 7607775A SE 7607775 A SE7607775 A SE 7607775A SE 7607775 L SE7607775 L SE 7607775L
Authority
SE
Sweden
Prior art keywords
signals
fixedly mounted
array
pushbutton
phase
Prior art date
Application number
SE7607775A
Other languages
Unknown language ( )
English (en)
Other versions
SE409272B (sv
Inventor
D W Hagelbarger
Original Assignee
Western Electric Co
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 Western Electric Co filed Critical Western Electric Co
Publication of SE7607775L publication Critical patent/SE7607775L/sv
Publication of SE409272B publication Critical patent/SE409272B/sv

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
    • H04M1/505—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 signals generated in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Telephone Set Structure (AREA)
  • Electronic Switches (AREA)
SE7607775A 1975-07-10 1976-07-07 Kretsanordning for avsokning av ett flertal switchar i och for identifiering av en aktiverad switch i ett matrisarrangemang av switchar SE409272B (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/594,819 US4007459A (en) 1975-07-10 1975-07-10 Multitone pushbutton dial phase shift scanning circuitry

Publications (2)

Publication Number Publication Date
SE7607775L true SE7607775L (sv) 1977-01-11
SE409272B SE409272B (sv) 1979-08-06

Family

ID=24380535

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7607775A SE409272B (sv) 1975-07-10 1976-07-07 Kretsanordning for avsokning av ett flertal switchar i och for identifiering av en aktiverad switch i ett matrisarrangemang av switchar

Country Status (11)

Country Link
US (1) US4007459A (sv)
JP (1) JPS5289403A (sv)
BE (1) BE843837A (sv)
CA (1) CA1049670A (sv)
DE (1) DE2630729C3 (sv)
ES (1) ES449725A1 (sv)
FR (1) FR2317844A1 (sv)
GB (1) GB1526463A (sv)
IT (1) IT1067420B (sv)
NL (1) NL174419C (sv)
SE (1) SE409272B (sv)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4087638A (en) * 1976-10-01 1978-05-02 Telaris Telecommunications Inc. DTMF Communication system
US4132871A (en) * 1977-06-22 1979-01-02 Fairchild Camera And Instrument Corporation Digitally synthesized multi-frequency signal generator
FR2470497A1 (fr) * 1979-11-23 1981-05-29 Cit Alcatel Clavier d'appel de poste telephonique automatique utilisant des techniques analogiques
JPS60136461A (ja) * 1983-12-26 1985-07-19 Toshiba Corp Ｄｔｍｆ信号発生装置
JPS60136459A (ja) * 1983-12-26 1985-07-19 Toshiba Corp Ｄｔｍｆ信号発生装置
JPS60136460A (ja) * 1983-12-26 1985-07-19 Toshiba Corp Ｄｔｍｆ信号発生装置
US4633183A (en) * 1985-02-28 1986-12-30 Hayes Microcomputer Products, Inc. Constant resolution frequency synthesizer
US5036321A (en) * 1989-08-31 1991-07-30 Otis Elevator Company Capacitive sensing, solid state touch button system
US6104320A (en) * 1998-01-23 2000-08-15 Holtek Semiconductor Inc. Input detection circuit for a matrix keyboard
US6259435B1 (en) * 1998-08-25 2001-07-10 Compaq Computer Corp. Obfuscated keyboard scan
RU2220449C1 (ru) 2002-12-19 2003-12-27 Акционерное общество закрытого типа "ЛИТЭКС" Способ маркирования изделий с помощью набора меток и метка для маркирования

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293450A (en) * 1963-09-16 1966-12-20 Beckman Instruments Inc Transfer circuit having wide range antilogarithm response
US3483553A (en) * 1967-06-08 1969-12-09 Scantlin Electronics Inc Keyboard input system
US3721976A (en) * 1971-02-01 1973-03-20 Omron Syst Inc Keyboard coding and interlock system
US3820028A (en) * 1971-08-27 1974-06-25 J Thomas Digital tone signal generator
US3904887A (en) * 1974-03-25 1975-09-09 Bell Telephone Labor Inc Snap-action pushbutton switch

Also Published As

Publication number Publication date
NL174419C (nl) 1984-06-01
FR2317844A1 (fr) 1977-02-04
IT1067420B (it) 1985-03-16
NL174419B (nl) 1984-01-02
SE409272B (sv) 1979-08-06
GB1526463A (en) 1978-09-27
DE2630729C3 (de) 1980-03-20
US4007459A (en) 1977-02-08
JPS5289403A (en) 1977-07-27
NL7607569A (nl) 1977-01-12
ES449725A1 (es) 1977-09-16
DE2630729B2 (de) 1979-07-12
FR2317844B1 (sv) 1980-11-07
BE843837A (fr) 1976-11-03
DE2630729A1 (de) 1977-01-20
CA1049670A (en) 1979-02-27

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