IT1024529B - Forchetta telefonica simmetrica - Google Patents
Forchetta telefonica simmetricaInfo
- Publication number
- IT1024529B IT1024529B IT67890/74A IT6789074A IT1024529B IT 1024529 B IT1024529 B IT 1024529B IT 67890/74 A IT67890/74 A IT 67890/74A IT 6789074 A IT6789074 A IT 6789074A IT 1024529 B IT1024529 B IT 1024529B
- Authority
- IT
- Italy
- Prior art keywords
- symmetric
- fork
- telephone
- telephone fork
- symmetric telephone
- Prior art date
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)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Coils Or Transformers For Communication (AREA)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT67890/74A IT1024529B (it) | 1974-03-21 | 1974-03-21 | Forchetta telefonica simmetrica |
FR7501840A FR2265233B1 (it) | 1974-03-21 | 1975-01-21 | |
CH145075A CH579335A5 (it) | 1974-03-21 | 1975-02-06 | |
US05/560,517 US3987253A (en) | 1974-03-21 | 1975-03-20 | Hybrid coupling for telecommunication system |
DE2512562A DE2512562B2 (de) | 1974-03-21 | 1975-03-21 | Symmetrische Gabelschaltung für einen Fernsprechapparat |
CA222,820A CA1026477A (en) | 1974-03-21 | 1975-03-21 | Symmetric resistive hybrid telephone circuit |
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 |
---|---|
IT1024529B true IT1024529B (it) | 1978-07-20 |
Family
ID=11306120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT67890/74A IT1024529B (it) | 1974-03-21 | 1974-03-21 | Forchetta telefonica simmetrica |
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 |
---|---|
FR2265233A1 (it) | 1975-10-17 |
DE2512562B2 (de) | 1980-04-24 |
FR2265233B1 (it) | 1979-04-27 |
US3987253A (en) | 1976-10-19 |
DE2512562A1 (de) | 1975-10-02 |
CA1026477A (en) | 1978-02-14 |
CH579335A5 (it) | 1976-08-31 |
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