FR2544938B1 - Circuit de transmission pour appareil telephonique dtmf - Google Patents

Circuit de transmission pour appareil telephonique dtmf

Info

Publication number
FR2544938B1
FR2544938B1 FR8406059A FR8406059A FR2544938B1 FR 2544938 B1 FR2544938 B1 FR 2544938B1 FR 8406059 A FR8406059 A FR 8406059A FR 8406059 A FR8406059 A FR 8406059A FR 2544938 B1 FR2544938 B1 FR 2544938B1
Authority
FR
France
Prior art keywords
transmission circuit
telephone device
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
FR8406059A
Other languages
English (en)
Other versions
FR2544938A1 (fr
Inventor
Henricus Johannes Maria Otten
Frederik Van Dongen
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
Publication of FR2544938A1 publication Critical patent/FR2544938A1/fr
Application granted granted Critical
Publication of FR2544938B1 publication Critical patent/FR2544938B1/fr
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)
  • Telephone Function (AREA)
  • Analogue/Digital Conversion (AREA)
FR8406059A 1983-04-19 1984-04-17 Circuit de transmission pour appareil telephonique dtmf Expired FR2544938B1 (fr)

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 (2)

Publication Number Publication Date
FR2544938A1 FR2544938A1 (fr) 1984-10-26
FR2544938B1 true FR2544938B1 (fr) 1986-01-24

Family

ID=19841727

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8406059A Expired FR2544938B1 (fr) 1983-04-19 1984-04-17 Circuit de transmission pour appareil telephonique dtmf

Country Status (9)

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

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
JPH0351342B2 (fr) 1991-08-06
BE899445A (fr) 1984-10-17
IT1176066B (it) 1987-08-12
EP0122680B1 (fr) 1987-01-21
NL8301366A (nl) 1984-11-16
FR2544938A1 (fr) 1984-10-26
IT8420561A1 (it) 1985-10-16
IT8420561A0 (it) 1984-04-16
EP0122680A1 (fr) 1984-10-24
JPS59202758A (ja) 1984-11-16
DE3462209D1 (en) 1987-02-26
US4585909A (en) 1986-04-29
CA1210540A (fr) 1986-08-26

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Legal Events

Date Code Title Description
CD Change of name or company name
ST Notification of lapse