IT1254795B - Dispositivo di soppressione di retroazione acustica particolarmente per suonerie ausiliarie in impianti telefonici a spina. - Google Patents
Dispositivo di soppressione di retroazione acustica particolarmente per suonerie ausiliarie in impianti telefonici a spina.Info
- Publication number
- IT1254795B IT1254795B ITMI920336A ITMI920336A IT1254795B IT 1254795 B IT1254795 B IT 1254795B IT MI920336 A ITMI920336 A IT MI920336A IT MI920336 A ITMI920336 A IT MI920336A IT 1254795 B IT1254795 B IT 1254795B
- Authority
- IT
- Italy
- Prior art keywords
- auxiliary
- ringtones
- suppression device
- acoustic feedback
- feedback suppression
- 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
- H04M1/738—Interface circuits for coupling substations to external telephone lines
- H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Telephone Function (AREA)
Abstract
Dispositivo di soppressione di retroazione acustica particolarmente per suonerie ausiliarie in impianti telefonici a spina caratterizzato dal fatto di comprendere dei diodi addizionali al ponte raddrizzatore della suoneria. Con tale accorgimento si realizza un disaccoppiamento in continua ed è possibile limitare la tensione alternata presente ai capi della suoneria ausiliaria.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI920336A IT1254795B (it) | 1992-02-17 | 1992-02-17 | Dispositivo di soppressione di retroazione acustica particolarmente per suonerie ausiliarie in impianti telefonici a spina. |
EP93102238A EP0556742B1 (en) | 1992-02-17 | 1993-02-12 | Acoustic feedback suppression device particularly for auxiliary ringers in plug-in telephone systems |
DE69319942T DE69319942T2 (de) | 1992-02-17 | 1993-02-12 | Unterdrückungsvorrichtung für akustische Rückkopplung, insbesondere für Zusatzwecker in Stecktelephonsystemen |
JP5025502A JPH066439A (ja) | 1992-02-17 | 1993-02-15 | プラグ−イン電話システムの補助リンガのための音響的フィードバックの抑制装置 |
US08/017,790 US5459783A (en) | 1992-02-17 | 1993-02-16 | Acoustic feedback suppression device particulary for auxiliary ringers in plug-in telephone systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI920336A IT1254795B (it) | 1992-02-17 | 1992-02-17 | Dispositivo di soppressione di retroazione acustica particolarmente per suonerie ausiliarie in impianti telefonici a spina. |
Publications (3)
Publication Number | Publication Date |
---|---|
ITMI920336A0 ITMI920336A0 (it) | 1992-02-17 |
ITMI920336A1 ITMI920336A1 (it) | 1993-08-17 |
IT1254795B true IT1254795B (it) | 1995-10-11 |
Family
ID=11362003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ITMI920336A IT1254795B (it) | 1992-02-17 | 1992-02-17 | Dispositivo di soppressione di retroazione acustica particolarmente per suonerie ausiliarie in impianti telefonici a spina. |
Country Status (5)
Country | Link |
---|---|
US (1) | US5459783A (it) |
EP (1) | EP0556742B1 (it) |
JP (1) | JPH066439A (it) |
DE (1) | DE69319942T2 (it) |
IT (1) | IT1254795B (it) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0756409B1 (en) * | 1995-07-28 | 2004-04-14 | STMicroelectronics S.r.l. | Spurious ting suppression device particularly for auxiliary ringers in socket telephone systems |
EP3955035B1 (en) | 2020-08-10 | 2024-09-25 | Österreichische Akademie der Wissenschaften | Photonic integrated circuit |
KR20230133420A (ko) | 2022-03-11 | 2023-09-19 | 주식회사 한화 | 대면적 단일 챔버를 갖는 기판 처리 장치 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2539415A1 (de) * | 1975-09-04 | 1977-03-10 | Siemens Ag | Schaltungsanordnung fuer eine zweiwege-fernsprechstation mit rueckfragemoeglichkeit |
IT1071838B (it) * | 1976-11-12 | 1985-04-10 | Cselt Centro Studi Lab Telecom | Soppressore di impulsi di suoneria indesiderati per apparecchi telefonici |
US4107476A (en) * | 1977-10-03 | 1978-08-15 | Northern Telecom Limited | Electronic tone ringer control circuit for a telephone set |
US4213012A (en) * | 1978-11-03 | 1980-07-15 | General Signal Corporation | Discriminating means for telephone circuits |
US4991051A (en) * | 1986-09-12 | 1991-02-05 | Northern Telecom Limited | Protection arrangements for communications lines |
US4941063A (en) * | 1988-03-04 | 1990-07-10 | Oneac Corporation | Telephone lines overvoltage protection apparatus |
-
1992
- 1992-02-17 IT ITMI920336A patent/IT1254795B/it active IP Right Grant
-
1993
- 1993-02-12 DE DE69319942T patent/DE69319942T2/de not_active Expired - Fee Related
- 1993-02-12 EP EP93102238A patent/EP0556742B1/en not_active Expired - Lifetime
- 1993-02-15 JP JP5025502A patent/JPH066439A/ja not_active Withdrawn
- 1993-02-16 US US08/017,790 patent/US5459783A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69319942T2 (de) | 1998-12-17 |
DE69319942D1 (de) | 1998-09-03 |
ITMI920336A1 (it) | 1993-08-17 |
EP0556742B1 (en) | 1998-07-29 |
JPH066439A (ja) | 1994-01-14 |
US5459783A (en) | 1995-10-17 |
EP0556742A1 (en) | 1993-08-25 |
ITMI920336A0 (it) | 1992-02-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
0001 | Granted | ||
TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19970227 |