NL8301366A - Transmissieschakeling voor een dtmf-telefoontoestel. - Google Patents

Transmissieschakeling voor een dtmf-telefoontoestel. Download PDF

Info

Publication number
NL8301366A
NL8301366A NL8301366A NL8301366A NL8301366A NL 8301366 A NL8301366 A NL 8301366A NL 8301366 A NL8301366 A NL 8301366A NL 8301366 A NL8301366 A NL 8301366A NL 8301366 A NL8301366 A NL 8301366A
Authority
NL
Netherlands
Prior art keywords
tones
filter
group
transmission circuit
subgroup
Prior art date
Application number
NL8301366A
Other languages
English (en)
Dutch (nl)
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
Priority to NL8301366A priority Critical patent/NL8301366A/nl
Priority to US06/594,181 priority patent/US4585909A/en
Priority to CA000451792A priority patent/CA1210540A/en
Priority to DE8484200516T priority patent/DE3462209D1/de
Priority to EP84200516A priority patent/EP0122680B1/de
Priority to IT20561/84A priority patent/IT1176066B/it
Priority to BE0/212784A priority patent/BE899445A/fr
Priority to FR8406059A priority patent/FR2544938B1/fr
Priority to JP59075895A priority patent/JPS59202758A/ja
Publication of NL8301366A publication Critical patent/NL8301366A/nl

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)
NL8301366A 1983-04-19 1983-04-19 Transmissieschakeling voor een dtmf-telefoontoestel. NL8301366A (nl)

Priority Applications (9)

Application Number Priority Date Filing Date Title
NL8301366A NL8301366A (nl) 1983-04-19 1983-04-19 Transmissieschakeling voor een dtmf-telefoontoestel.
US06/594,181 US4585909A (en) 1983-04-19 1984-03-28 Transmission circuit for a DTMF-telephone set
CA000451792A CA1210540A (en) 1983-04-19 1984-04-11 Transmission circuit for a dtmf-telephone set
DE8484200516T DE3462209D1 (en) 1983-04-19 1984-04-12 Transmission circuit for a dtmf telephone set
EP84200516A EP0122680B1 (de) 1983-04-19 1984-04-12 Sendeschaltung für einen DTMF-Fernsprechapparat
IT20561/84A IT1176066B (it) 1983-04-19 1984-04-16 Circuito di trasmissione per un apparecchio telefonico a due toni multifrequenza
BE0/212784A BE899445A (fr) 1983-04-19 1984-04-17 Circuit de transmission pour appareil telephonique dtmf.
FR8406059A FR2544938B1 (fr) 1983-04-19 1984-04-17 Circuit de transmission pour appareil telephonique dtmf
JP59075895A JPS59202758A (ja) 1983-04-19 1984-04-17 送信回路

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8301366 1983-04-19
NL8301366A NL8301366A (nl) 1983-04-19 1983-04-19 Transmissieschakeling voor een dtmf-telefoontoestel.

Publications (1)

Publication Number Publication Date
NL8301366A true NL8301366A (nl) 1984-11-16

Family

ID=19841727

Family Applications (1)

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

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
FR2544938A1 (fr) 1984-10-26
IT8420561A0 (it) 1984-04-16
CA1210540A (en) 1986-08-26
US4585909A (en) 1986-04-29
IT8420561A1 (it) 1985-10-16
BE899445A (fr) 1984-10-17
JPH0351342B2 (de) 1991-08-06
FR2544938B1 (fr) 1986-01-24
EP0122680A1 (de) 1984-10-24
JPS59202758A (ja) 1984-11-16
EP0122680B1 (de) 1987-01-21
IT1176066B (it) 1987-08-12
DE3462209D1 (en) 1987-02-26

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Legal Events

Date Code Title Description
A1C A request for examination has been filed
A85 Still pending on 85-01-01
BV The patent application has lapsed