SE372679B - - Google Patents
Info
- Publication number
- SE372679B SE372679B SE7114894A SE1489471A SE372679B SE 372679 B SE372679 B SE 372679B SE 7114894 A SE7114894 A SE 7114894A SE 1489471 A SE1489471 A SE 1489471A SE 372679 B SE372679 B SE 372679B
- Authority
- SE
- Sweden
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
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
- H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Circuit For Audible Band Transducer (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7017136A NL7017136A (da) | 1970-11-24 | 1970-11-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE372679B true SE372679B (da) | 1974-12-23 |
Family
ID=19811633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE7114894A SE372679B (da) | 1970-11-24 | 1971-11-22 |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3864532A (da) |
| AU (1) | AU462020B2 (da) |
| BE (1) | BE775780A (da) |
| CA (1) | CA953042A (da) |
| DE (1) | DE2154315B2 (da) |
| DK (1) | DK129017B (da) |
| FR (1) | FR2115332B1 (da) |
| GB (1) | GB1367157A (da) |
| NL (1) | NL7017136A (da) |
| SE (1) | SE372679B (da) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5652320B2 (da) * | 1974-04-10 | 1981-12-11 | ||
| DE2647439C2 (de) * | 1976-10-21 | 1982-10-21 | Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt | Schallsignalgeber, insbesondere für Kraftfahrzeuge |
| US4163873A (en) * | 1977-08-09 | 1979-08-07 | Telephonic Equipment Corporation | Telephone solid state ringer |
| US4251694A (en) * | 1979-08-16 | 1981-02-17 | Western Electric Company, Inc. | Tone-ringing circuits and methods for telephone sets |
| US4728933A (en) * | 1986-03-24 | 1988-03-01 | U.S. Holding Company, Inc. | Miniature dual cavity ringer |
| JP2605321B2 (ja) * | 1987-12-28 | 1997-04-30 | ヤマハ株式会社 | 音響装置 |
| JP2701279B2 (ja) * | 1987-12-28 | 1998-01-21 | ヤマハ株式会社 | 音響装置 |
| US5218634A (en) * | 1990-05-29 | 1993-06-08 | American Phone Products, Inc. | Ringer assembly |
| US6748060B2 (en) | 2002-04-08 | 2004-06-08 | Plantronics, Inc. | Apparatus and method for providing voice telephone instructions |
| JP2013026911A (ja) * | 2011-07-22 | 2013-02-04 | Nec Access Technica Ltd | 電圧生成装置および電圧生成方法 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2759179A (en) * | 1952-12-05 | 1956-08-14 | Bell Telephone Labor Inc | Ringing circuit |
| BE637296A (da) * | 1962-09-17 | |||
| GB1039668A (en) * | 1964-07-28 | 1966-08-17 | Ass Elect Ind | Improvements relating to telephone system substation circuits |
| GB1086702A (en) * | 1964-10-15 | 1967-10-11 | Post Office | Electrical calling circuits |
| GB1128053A (en) * | 1965-07-26 | 1968-09-25 | Standard Telephones Cables Ltd | Acoustic signalling means particularly for telephone sets |
-
1970
- 1970-11-24 NL NL7017136A patent/NL7017136A/xx unknown
-
1971
- 1971-11-02 DE DE19712154315 patent/DE2154315B2/de not_active Ceased
- 1971-11-11 US US197855A patent/US3864532A/en not_active Expired - Lifetime
- 1971-11-19 GB GB5386271A patent/GB1367157A/en not_active Expired
- 1971-11-19 DK DK569071AA patent/DK129017B/da not_active IP Right Cessation
- 1971-11-22 CA CA128,201A patent/CA953042A/en not_active Expired
- 1971-11-22 SE SE7114894A patent/SE372679B/xx unknown
- 1971-11-22 AU AU35985/71A patent/AU462020B2/en not_active Expired
- 1971-11-23 FR FR7141787A patent/FR2115332B1/fr not_active Expired
- 1971-11-24 BE BE775780A patent/BE775780A/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| NL7017136A (da) | 1972-05-26 |
| GB1367157A (en) | 1974-09-18 |
| US3864532A (en) | 1975-02-04 |
| AU3598571A (en) | 1973-05-31 |
| FR2115332A1 (da) | 1972-07-07 |
| CA953042A (en) | 1974-08-13 |
| BE775780A (fr) | 1972-05-24 |
| FR2115332B1 (da) | 1977-01-21 |
| AU462020B2 (en) | 1975-05-27 |
| DK129017B (da) | 1974-08-05 |
| DE2154315A1 (de) | 1972-05-25 |
| DE2154315B2 (de) | 1976-05-20 |