JPS56501185A - - Google Patents
Info
- Publication number
- JPS56501185A JPS56501185A JP50180880A JP50180880A JPS56501185A JP S56501185 A JPS56501185 A JP S56501185A JP 50180880 A JP50180880 A JP 50180880A JP 50180880 A JP50180880 A JP 50180880A JP S56501185 A JPS56501185 A JP S56501185A
- Authority
- JP
- Japan
- 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.)
- Pending
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)
- Electrotherapy Devices (AREA)
- Telephone Function (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 (1)
| Publication Number | Publication Date |
|---|---|
| JPS56501185A true JPS56501185A (en) | 1981-08-20 |
Family
ID=26748187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50180880A Pending JPS56501185A (en) | 1979-08-20 | 1980-08-01 |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS56501185A (en) |
| DE (1) | DE3049811C2 (en) |
| GB (1) | GB2071963B (en) |
| SE (2) | SE428986B (en) |
| WO (1) | WO1981000657A1 (en) |
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 (en) * | 1985-04-15 | 1986-10-22 | Ricoh Co Ltd | Call signal detection circuit |
| FR2693335B1 (en) * | 1992-07-02 | 1994-08-05 | Matra Communication | RINGER CIRCUIT, PARTICULARLY FOR TELEPHONE SET. |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3740490A (en) * | 1971-01-18 | 1973-06-19 | Bell Telephone Labor Inc | Tone ringer |
| CA952634A (en) * | 1971-01-18 | 1974-08-06 | Robert F. Mcalonie | Tone ringer |
| DE2205559C3 (en) * | 1972-02-07 | 1980-08-14 | Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt | Circuitry for AC call receiving lines to prevent the effects of DC pulses |
| 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 (en) * | 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 JP JP50180880A patent/JPS56501185A/ja active Pending
- 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/en not_active Expired
-
1981
- 1981-04-14 SE SE8102406A patent/SE428986B/en not_active IP Right Cessation
-
1982
- 1982-07-23 SE SE8204441A patent/SE429707B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| SE8204441L (en) | 1982-07-23 |
| DE3049811C2 (en) | 1987-04-16 |
| GB2071963A (en) | 1981-09-23 |
| SE8204441D0 (en) | 1982-07-23 |
| GB2071963B (en) | 1983-07-27 |
| SE429707B (en) | 1983-09-19 |
| WO1981000657A1 (en) | 1981-03-05 |
| SE428986B (en) | 1983-08-01 |
| SE8102406L (en) | 1981-04-14 |
| DE3049811T1 (en) | 1982-02-25 |