SG50790G - Dtmf-telephone set with multiple use of the logic of the digital tone generator - Google Patents
Dtmf-telephone set with multiple use of the logic of the digital tone generatorInfo
- Publication number
- SG50790G SG50790G SG50790A SG50790A SG50790G SG 50790 G SG50790 G SG 50790G SG 50790 A SG50790 A SG 50790A SG 50790 A SG50790 A SG 50790A SG 50790 G SG50790 G SG 50790G
- Authority
- SG
- Singapore
- Prior art keywords
- dtmf
- logic
- telephone set
- tone generator
- multiple use
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
-
- 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
-
- 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
- H04M1/53—Generation of additional signals, e.g. additional pulses
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8303701A NL8303701A (nl) | 1983-10-27 | 1983-10-27 | Dtmf-telefoontoestel met meervoudig gebruik van de logica van de digitale toongenerator. |
Publications (1)
Publication Number | Publication Date |
---|---|
SG50790G true SG50790G (en) | 1990-08-31 |
Family
ID=19842625
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SG50790A SG50790G (en) | 1983-10-27 | 1990-07-04 | Dtmf-telephone set with multiple use of the logic of the digital tone generator |
Country Status (7)
Country | Link |
---|---|
US (1) | US4571462A (ja) |
EP (1) | EP0143481B1 (ja) |
JP (1) | JPS60111558A (ja) |
CA (1) | CA1224293A (ja) |
DE (1) | DE3475862D1 (ja) |
NL (1) | NL8303701A (ja) |
SG (1) | SG50790G (ja) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3504243A1 (de) * | 1985-02-08 | 1986-08-14 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Verfahren und schaltungsanordnung zur erzeugung eines akustischen rufsignals in teilnehmerendstellen von fernmeldeanlagen |
US4669110A (en) * | 1985-10-25 | 1987-05-26 | Itt Corporation | Call progress tone system |
US4914694A (en) * | 1988-04-11 | 1990-04-03 | Eidak Corporation | Modifying a television signal to inhibit recording/reproduction |
JPH0226167A (ja) * | 1988-07-15 | 1990-01-29 | Mitsubishi Electric Corp | 小型電子機器 |
US5208852A (en) * | 1988-09-27 | 1993-05-04 | Seiko Epson Corporation | Sound generation circuit |
US4879743A (en) * | 1988-10-03 | 1989-11-07 | American Telephone And Telegraph Company | PBX and adjunct using multi-frequency tones for communication therebetween |
JP2560660Y2 (ja) * | 1991-03-29 | 1998-01-26 | 村田機械株式会社 | ワイヤレス電話機 |
NL9200320A (nl) * | 1992-02-20 | 1993-09-16 | Ericsson Radio Systems Bv | Keten voor het koppelen van een telefooncentrale en een oproepcentrale van een personenoproepstelsel. |
US5459784A (en) * | 1992-09-28 | 1995-10-17 | Comsat Corporation | Dual-tone multifrequency (DTMF) signalling transparency for low-data-rate vocoders |
US5583933A (en) * | 1994-08-05 | 1996-12-10 | Mark; Andrew R. | Method and apparatus for the secure communication of data |
US5907597A (en) * | 1994-08-05 | 1999-05-25 | Smart Tone Authentication, Inc. | Method and system for the secure communication of data |
US5848149A (en) * | 1995-05-26 | 1998-12-08 | Lucent Technologies Inc. | Subscriber line interface and power circuit |
JP2004516709A (ja) * | 2000-12-13 | 2004-06-03 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 主観的な低音を知覚させることができる呼出信号発生手段を有する電気音響装置 |
JP2003169128A (ja) * | 2001-12-03 | 2003-06-13 | Matsushita Electric Ind Co Ltd | 電話機及び構内交換機 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4061886A (en) * | 1975-09-29 | 1977-12-06 | Mostek Corporation | Dual tone multiple frequency generator |
GB1521127A (en) * | 1975-10-02 | 1978-08-16 | Standard Telephones Cables Ltd | Telecommunication systems |
DE2924752C2 (de) * | 1979-06-20 | 1984-02-02 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Tongenerator zur Erzeugung von Signalisierungsfrequenzen in einem MFV-Fernsprechapparat |
FR2513051B1 (fr) * | 1981-06-03 | 1985-06-07 | Constr Telephoniques | Circuit de generation d'ouvertures de boucle calibrees pour poste telephonique a numerotation multifrequence |
US4503288A (en) * | 1981-08-31 | 1985-03-05 | Novation, Inc. | Intelligent telephone |
-
1983
- 1983-10-27 NL NL8303701A patent/NL8303701A/nl not_active Application Discontinuation
-
1984
- 1984-10-18 EP EP84201509A patent/EP0143481B1/en not_active Expired
- 1984-10-18 DE DE8484201509T patent/DE3475862D1/de not_active Expired
- 1984-10-22 US US06/663,603 patent/US4571462A/en not_active Expired - Fee Related
- 1984-10-24 CA CA000466175A patent/CA1224293A/en not_active Expired
- 1984-10-24 JP JP59222299A patent/JPS60111558A/ja active Granted
-
1990
- 1990-07-04 SG SG50790A patent/SG50790G/en unknown
Also Published As
Publication number | Publication date |
---|---|
NL8303701A (nl) | 1985-05-17 |
DE3475862D1 (en) | 1989-02-02 |
JPS60111558A (ja) | 1985-06-18 |
EP0143481B1 (en) | 1988-12-28 |
CA1224293A (en) | 1987-07-14 |
JPH0453140B2 (ja) | 1992-08-25 |
US4571462A (en) | 1986-02-18 |
EP0143481A1 (en) | 1985-06-05 |
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