SE8204441L - Elektronisk tonalstrarkrets - Google Patents
Elektronisk tonalstrarkretsInfo
- Publication number
- SE8204441L SE8204441L SE8204441A SE8204441A SE8204441L SE 8204441 L SE8204441 L SE 8204441L SE 8204441 A SE8204441 A SE 8204441A SE 8204441 A SE8204441 A SE 8204441A SE 8204441 L SE8204441 L SE 8204441L
- Authority
- SE
- Sweden
- Prior art keywords
- ringer
- line
- current
- current sources
- insensitivity
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Amplifiers (AREA)
- Dc-Dc Converters (AREA)
- Telephone Function (AREA)
- Electrotherapy Devices (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/067,717 US4292604A (en) | 1979-08-20 | 1979-08-20 | Relaxation oscillator with plural constant current sources |
US06/067,718 US4276448A (en) | 1979-08-20 | 1979-08-20 | Electronic tone ringer |
Publications (3)
Publication Number | Publication Date |
---|---|
SE8204441D0 SE8204441D0 (sv) | 1982-07-23 |
SE8204441L true SE8204441L (sv) | 1982-07-23 |
SE429707B SE429707B (sv) | 1983-09-19 |
Family
ID=26748187
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE8102406A SE428986B (sv) | 1979-08-20 | 1981-04-14 | Tonalstrarkrets |
SE8204441A SE429707B (sv) | 1979-08-20 | 1982-07-23 | Tonalstrar krets |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE8102406A SE428986B (sv) | 1979-08-20 | 1981-04-14 | Tonalstrarkrets |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS56501185A (sv) |
DE (1) | DE3049811C2 (sv) |
GB (1) | GB2071963B (sv) |
SE (2) | SE428986B (sv) |
WO (1) | WO1981000657A1 (sv) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4508937A (en) * | 1983-02-28 | 1985-04-02 | At&T Information Systems Inc. | Method and circuitry for encoding telephone ringing signals |
JPS61237559A (ja) * | 1985-04-15 | 1986-10-22 | Ricoh Co Ltd | 呼出信号検出回路 |
FR2693335B1 (fr) * | 1992-07-02 | 1994-08-05 | Matra Communication | Circuit de sonnerie notamment pour poste telephonique. |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA952634A (en) * | 1971-01-18 | 1974-08-06 | Robert F. Mcalonie | Tone ringer |
US3740490A (en) * | 1971-01-18 | 1973-06-19 | Bell Telephone Labor Inc | Tone ringer |
DE2205559C3 (de) * | 1972-02-07 | 1980-08-14 | Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt | Schaltungsanordnung für Wechselstrom-Anrufempfangsstrecken zur Verhinderung der Einwirkung von Gleichstromimpulsen |
US3808379A (en) * | 1972-05-30 | 1974-04-30 | Gte Automatic Electric Lab Inc | Telephone tone ringer |
US3860764A (en) * | 1973-01-12 | 1975-01-14 | Itt | Electronic tone generator |
FR2235556B1 (sv) * | 1973-06-28 | 1978-09-08 | Person Jean Michel | |
US3867585A (en) * | 1973-08-02 | 1975-02-18 | Gte Automatic Electric Lab Inc | Electronic tone ringer |
US3965307A (en) * | 1974-05-28 | 1976-06-22 | Gte Automatic Electric Laboratories Incorporated | Electronic tone ringer |
US4046970A (en) * | 1976-04-12 | 1977-09-06 | Magnetic Controls Company | Ringing detector for telephone circuits |
US4081617A (en) * | 1976-10-29 | 1978-03-28 | Technex International Ltd. | Electronic ringing circuit for telephone systems |
-
1980
- 1980-08-01 WO PCT/US1980/000975 patent/WO1981000657A1/en active Application Filing
- 1980-08-01 GB GB8112103A patent/GB2071963B/en not_active Expired
- 1980-08-01 DE DE3049811T patent/DE3049811C2/de not_active Expired
- 1980-08-01 JP JP50180880A patent/JPS56501185A/ja active Pending
-
1981
- 1981-04-14 SE SE8102406A patent/SE428986B/sv not_active IP Right Cessation
-
1982
- 1982-07-23 SE SE8204441A patent/SE429707B/sv not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
SE8204441D0 (sv) | 1982-07-23 |
SE8102406L (sv) | 1981-04-14 |
DE3049811T1 (de) | 1982-02-25 |
GB2071963B (en) | 1983-07-27 |
WO1981000657A1 (en) | 1981-03-05 |
DE3049811C2 (de) | 1987-04-16 |
SE428986B (sv) | 1983-08-01 |
JPS56501185A (sv) | 1981-08-20 |
SE429707B (sv) | 1983-09-19 |
GB2071963A (en) | 1981-09-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |
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