SE7501942L - - Google Patents

Info

Publication number
SE7501942L
SE7501942L SE7501942A SE7501942A SE7501942L SE 7501942 L SE7501942 L SE 7501942L SE 7501942 A SE7501942 A SE 7501942A SE 7501942 A SE7501942 A SE 7501942A SE 7501942 L SE7501942 L SE 7501942L
Authority
SE
Sweden
Prior art keywords
networks
constant
output network
current
resistors
Prior art date
Application number
SE7501942A
Other languages
Unknown language ( )
English (en)
Other versions
SE399169B (sv
Inventor
Der Plaats P J Van
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 SE7501942L publication Critical patent/SE7501942L/
Publication of SE399169B publication Critical patent/SE399169B/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)
  • Amplifiers (AREA)
  • Telephonic Communication Services (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
SE7501942A 1974-02-26 1975-02-21 Kopplingsanordning for en telefonapparat med tonknappsval eller tonknappsinstellning SE399169B (sv)

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
SE7501942L true SE7501942L (en, 2012) 1975-08-27
SE399169B SE399169B (sv) 1978-01-30

Family

ID=19820838

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7501942A SE399169B (sv) 1974-02-26 1975-02-21 Kopplingsanordning for en telefonapparat med tonknappsval eller tonknappsinstellning

Country Status (10)

Country Link
US (1) US3978295A (en, 2012)
JP (1) JPS547644B2 (en, 2012)
BE (1) BE825893A (en, 2012)
CA (1) CA1015079A (en, 2012)
DE (1) DE2505955C3 (en, 2012)
DK (1) DK141979B (en, 2012)
FR (1) FR2262457B1 (en, 2012)
GB (1) GB1452254A (en, 2012)
NL (1) NL7402574A (en, 2012)
SE (1) SE399169B (en, 2012)

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
USRE25507E (en) * 1959-12-16 1964-01-07 Frequency - cps
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 (en, 2012) * 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
DK141979B (da) 1980-07-28
GB1452254A (en) 1976-10-13
DK67775A (en, 2012) 1975-10-27
JPS547644B2 (en, 2012) 1979-04-09
FR2262457B1 (en, 2012) 1978-02-03
DE2505955C3 (de) 1981-06-04
BE825893A (fr) 1975-08-25
FR2262457A1 (en, 2012) 1975-09-19
JPS50120506A (en, 2012) 1975-09-20
DE2505955B2 (de) 1980-08-14
DK141979C (en, 2012) 1980-12-08
SE399169B (sv) 1978-01-30
US3978295A (en) 1976-08-31
DE2505955A1 (de) 1975-08-28
NL7402574A (nl) 1975-08-28
CA1015079A (en) 1977-08-02

Similar Documents

Publication Publication Date Title
GB1280388A (en) Telephone instrument
GB1534459A (en) Key telephone circuit
GB2122851A (en) Loudspeaking telephones
DE3167719D1 (en) Telephone circuit
US4327255A (en) Keypad caller for a telephone set
SE7501942L (en, 2012)
US3898392A (en) Answer-back assembly for a key telephone system
US4669110A (en) Call progress tone system
US3218395A (en) Electronic signaling arrangement
GB918275A (en) Improvements in or relating to signalling arrangements in standing micro-telephone instruments
ES465856A1 (es) Perfeccionamientos en redes telefonicas electronicas.
JPS55138955A (en) Time sharing channel interruption system
KR950000963B1 (ko) 키폰 전화기에서 온훅시 내선 통화 선택회로
SU1589423A1 (ru) Разговорно-вызывное устройство коммутатора диспетчерской св зи
SU882020A2 (ru) Абонентское переговорное устройство
KR790001631B1 (ko) 송화기형 터치톤 다이얼(Touch Tone Dial) 발생장치
JPS57109450A (en) Howling preventing circuit for telephone set callable by loudspeaker
JPS5787269A (en) Telephone set circuit
GB954211A (en) Circuit arrangement for subscribers' stations
KR940001695B1 (ko) 다기능 전화기의 통화로 제어장치
JPS5689159A (en) Speaker switching telephone system
SU634482A1 (ru) Телефонный аппарат,управл емый голосом
GB1277676A (en) Voice frequency signalling arrangement
JPS56112194A (en) Omnibus circuit device
GB1494136A (en) Telephone exchanges

Legal Events

Date Code Title Description
NUG Patent has lapsed

Ref document number: 7501942-2

Effective date: 19920904

Format of ref document f/p: F