CH579335A5 - - Google Patents
Info
- Publication number
- CH579335A5 CH579335A5 CH145075A CH145075A CH579335A5 CH 579335 A5 CH579335 A5 CH 579335A5 CH 145075 A CH145075 A CH 145075A CH 145075 A CH145075 A CH 145075A CH 579335 A5 CH579335 A5 CH 579335A5
- Authority
- CH
- Switzerland
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
- H04M1/585—Anti-side-tone circuits implemented without inductive element
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Coils Or Transformers For Communication (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT67890/74A IT1024529B (it) | 1974-03-21 | 1974-03-21 | Forchetta telefonica simmetrica |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH579335A5 true CH579335A5 (it) | 1976-08-31 |
Family
ID=11306120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH145075A CH579335A5 (it) | 1974-03-21 | 1975-02-06 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3987253A (it) |
| CA (1) | CA1026477A (it) |
| CH (1) | CH579335A5 (it) |
| DE (1) | DE2512562B2 (it) |
| FR (1) | FR2265233B1 (it) |
| IT (1) | IT1024529B (it) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4048647A (en) * | 1976-09-10 | 1977-09-13 | Northern Telecom Limited | Solid state disconnect device |
| IT1110111B (it) * | 1979-01-12 | 1985-12-23 | Acet Srl | Impianto citofonico a portiere elettrico a due fili,suscettibile di utilizzare un pressistente impianto a campanello,senza necessita' di ulteriori linee di alimentazione |
| DE3309822C2 (de) * | 1983-03-18 | 1985-11-14 | Siemens AG, 1000 Berlin und 8000 München | Gabelschaltung für eine zentralgespeiste Teilnehmerstation |
| US4598396A (en) * | 1984-04-03 | 1986-07-01 | Itt Corporation | Duplex transmission mechanism for digital telephones |
| JPH03296359A (ja) * | 1990-04-16 | 1991-12-27 | Fujitsu Ltd | Ｉｓｄｎインタフェース回路 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3033940A (en) * | 1960-09-09 | 1962-05-08 | Itt | Operator telephone circuit |
| US3440367A (en) * | 1966-05-06 | 1969-04-22 | Bell Telephone Labor Inc | Nonreactive antisidetone network for a telephone set |
| DE1919111B1 (de) * | 1969-04-15 | 1970-10-29 | Siemens Ag | Schaltungsanordnung fuer einen Transistorhoerverstaerker mit Daempfungsausgleich in Fernsprechteilnehmerstellen |
| GB1257878A (it) * | 1970-04-10 | 1971-12-22 |
-
1974
- 1974-03-21 IT IT67890/74A patent/IT1024529B/it active
-
1975
- 1975-01-21 FR FR7501840A patent/FR2265233B1/fr not_active Expired
- 1975-02-06 CH CH145075A patent/CH579335A5/xx not_active IP Right Cessation
- 1975-03-20 US US05/560,517 patent/US3987253A/en not_active Expired - Lifetime
- 1975-03-21 DE DE2512562A patent/DE2512562B2/de not_active Ceased
- 1975-03-21 CA CA222,820A patent/CA1026477A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| IT1024529B (it) | 1978-07-20 |
| FR2265233B1 (it) | 1979-04-27 |
| DE2512562A1 (de) | 1975-10-02 |
| US3987253A (en) | 1976-10-19 |
| DE2512562B2 (de) | 1980-04-24 |
| CA1026477A (en) | 1978-02-14 |
| FR2265233A1 (it) | 1975-10-17 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PFA | Name/firm changed |
Owner name: ITALTEL S.P.A. |
|
| PL | Patent ceased |