FR2544938B1 - Circuit de transmission pour appareil telephonique dtmf - Google Patents
Circuit de transmission pour appareil telephonique dtmfInfo
- 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
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)
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)
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)
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 |
-
1983
- 1983-04-19 NL NL8301366A patent/NL8301366A/nl not_active Application Discontinuation
-
1984
- 1984-03-28 US US06/594,181 patent/US4585909A/en not_active Expired - Fee Related
- 1984-04-11 CA CA000451792A patent/CA1210540A/fr not_active Expired
- 1984-04-12 EP EP84200516A patent/EP0122680B1/fr not_active Expired
- 1984-04-12 DE DE8484200516T patent/DE3462209D1/de not_active Expired
- 1984-04-16 IT IT20561/84A patent/IT1176066B/it active
- 1984-04-17 FR FR8406059A patent/FR2544938B1/fr not_active Expired
- 1984-04-17 JP JP59075895A patent/JPS59202758A/ja active Granted
- 1984-04-17 BE BE0/212784A patent/BE899445A/fr not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
FR2544938A1 (fr) | 1984-10-26 |
IT8420561A1 (it) | 1985-10-16 |
EP0122680A1 (fr) | 1984-10-24 |
BE899445A (fr) | 1984-10-17 |
CA1210540A (fr) | 1986-08-26 |
JPS59202758A (ja) | 1984-11-16 |
EP0122680B1 (fr) | 1987-01-21 |
IT8420561A0 (it) | 1984-04-16 |
JPH0351342B2 (fr) | 1991-08-06 |
DE3462209D1 (en) | 1987-02-26 |
NL8301366A (nl) | 1984-11-16 |
IT1176066B (it) | 1987-08-12 |
US4585909A (en) | 1986-04-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
CD | Change of name or company name | ||
ST | Notification of lapse |