ES384060A1 - Equipo de operadora a cuatro hilos. - Google Patents
Equipo de operadora a cuatro hilos.Info
- Publication number
- ES384060A1 ES384060A1 ES384060A ES384060A ES384060A1 ES 384060 A1 ES384060 A1 ES 384060A1 ES 384060 A ES384060 A ES 384060A ES 384060 A ES384060 A ES 384060A ES 384060 A1 ES384060 A1 ES 384060A1
- Authority
- ES
- Spain
- Prior art keywords
- coupling
- input
- amplifier
- transmission
- operator
- Prior art date
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Amplifiers (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR6933246A FR2058843A5 (es) | 1969-09-30 | 1969-09-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
ES384060A1 true ES384060A1 (es) | 1972-12-16 |
Family
ID=9040795
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES384060A Expired ES384060A1 (es) | 1969-09-30 | 1970-09-29 | Equipo de operadora a cuatro hilos. |
Country Status (3)
Country | Link |
---|---|
ES (1) | ES384060A1 (es) |
FR (1) | FR2058843A5 (es) |
GB (1) | GB1282190A (es) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH681409A5 (en) * | 1990-10-11 | 1993-03-15 | Siemens Ag Albis | Telephone connection speech monitoring circuit - combines extracted data words obtained from incoming and outgoing speech signals |
-
1969
- 1969-09-30 FR FR6933246A patent/FR2058843A5/fr not_active Expired
-
1970
- 1970-09-24 GB GB4550770A patent/GB1282190A/en not_active Expired
- 1970-09-29 ES ES384060A patent/ES384060A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB1282190A (en) | 1972-07-19 |
FR2058843A5 (es) | 1971-05-28 |
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