DE3462209D1 - Transmission circuit for a dtmf telephone set - Google Patents

Transmission circuit for a dtmf telephone set

Info

Publication number
DE3462209D1
DE3462209D1 DE8484200516T DE3462209T DE3462209D1 DE 3462209 D1 DE3462209 D1 DE 3462209D1 DE 8484200516 T DE8484200516 T DE 8484200516T DE 3462209 T DE3462209 T DE 3462209T DE 3462209 D1 DE3462209 D1 DE 3462209D1
Authority
DE
Germany
Prior art keywords
transmission circuit
telephone set
dtmf telephone
dtmf
transmission
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
DE8484200516T
Other languages
English (en)
Inventor
Henricus Johannes Maria Otten
Dongen Frederik Van
Josephus Johannes Anto Geboers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken 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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of DE3462209D1 publication Critical patent/DE3462209D1/de
Expired legal-status Critical Current

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)
  • Interface Circuits In Exchanges (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Analogue/Digital Conversion (AREA)
  • Telephone Function (AREA)
DE8484200516T 1983-04-19 1984-04-12 Transmission circuit for a dtmf telephone set Expired DE3462209D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL8301366A NL8301366A (nl) 1983-04-19 1983-04-19 Transmissieschakeling voor een dtmf-telefoontoestel.

Publications (1)

Publication Number Publication Date
DE3462209D1 true DE3462209D1 (en) 1987-02-26

Family

ID=19841727

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8484200516T Expired DE3462209D1 (en) 1983-04-19 1984-04-12 Transmission circuit for a dtmf telephone set

Country Status (9)

Country Link
US (1) US4585909A (de)
EP (1) EP0122680B1 (de)
JP (1) JPS59202758A (de)
BE (1) BE899445A (de)
CA (1) CA1210540A (de)
DE (1) DE3462209D1 (de)
FR (1) FR2544938B1 (de)
IT (1) IT1176066B (de)
NL (1) NL8301366A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0644781B2 (ja) * 1985-07-19 1994-06-08 株式会社日立製作所 デイジタルト−ン発生回路
JPH0236652A (ja) * 1988-07-27 1990-02-06 Sankyo Seiki Mfg Co Ltd オートダイヤル装置
AU622744B2 (en) * 1989-02-02 1992-04-16 Alcatel Australia Limited Dialler chip mode signal
US5907597A (en) * 1994-08-05 1999-05-25 Smart Tone Authentication, Inc. Method and system for the secure communication of data

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL160687C (nl) * 1972-06-10 1979-11-15 Philips Nv Toongenerator voor het opwekken van gekozen frequenties.
US3838348A (en) * 1973-06-25 1974-09-24 Bell Telephone Labor Inc Digital multifrequency signal generator
FR2368843A1 (fr) * 1976-10-22 1978-05-19 Constr Telephoniques Emetteur de signaux multifrequences

Also Published As

Publication number Publication date
IT8420561A0 (it) 1984-04-16
US4585909A (en) 1986-04-29
EP0122680A1 (de) 1984-10-24
IT8420561A1 (it) 1985-10-16
CA1210540A (en) 1986-08-26
EP0122680B1 (de) 1987-01-21
IT1176066B (it) 1987-08-12
JPH0351342B2 (de) 1991-08-06
NL8301366A (nl) 1984-11-16
FR2544938A1 (fr) 1984-10-26
FR2544938B1 (fr) 1986-01-24
JPS59202758A (ja) 1984-11-16
BE899445A (fr) 1984-10-17

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: PHILIPS ELECTRONICS N.V., EINDHOVEN, NL

8339 Ceased/non-payment of the annual fee