ES409421A1 - Mejoras en los circuitos electronicos de aparato de abona- do. - Google Patents
Mejoras en los circuitos electronicos de aparato de abona- do.Info
- Publication number
- ES409421A1 ES409421A1 ES409421A ES409421A ES409421A1 ES 409421 A1 ES409421 A1 ES 409421A1 ES 409421 A ES409421 A ES 409421A ES 409421 A ES409421 A ES 409421A ES 409421 A1 ES409421 A1 ES 409421A1
- Authority
- ES
- Spain
- Prior art keywords
- subscriber apparatus
- transmission circuit
- electronic telephone
- transmission
- telephone transmission
- 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
- 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)
- Amplifiers (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Mejoras en los circuitos electrónicos de aparatos de abonado caracterizadas por un circuito electrónico de transmisión telefónica (aparato de abonado) que comprenden un micrófono electrodinámico, un amplificador transistorizado para dicho micrófono, un receptor telefónico, un amplificador transistorizado por dicho receptor, medios para la compensación de las pérdidas variables en la línea, con independencia para cada sentido de transmisión, desde dicho aparato de abonado, por una línea bifilar conectada al mismo y una red activa de configuración R-C adaptada para proporcionar, dentro de dicho aparato de abonado, la separación de los sentidos de transmisión a la distancia que se desee sin la utilización de un transformador híbrido.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5719671 | 1971-12-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
ES409421A1 true ES409421A1 (es) | 1975-12-16 |
Family
ID=10478595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES409421A Expired ES409421A1 (es) | 1971-12-09 | 1972-12-07 | Mejoras en los circuitos electronicos de aparato de abona- do. |
Country Status (11)
Country | Link |
---|---|
US (1) | US3823272A (es) |
AU (1) | AU473401B2 (es) |
BE (1) | BE792329A (es) |
CA (1) | CA972887A (es) |
CH (1) | CH557626A (es) |
DE (1) | DE2259993A1 (es) |
ES (1) | ES409421A1 (es) |
FR (1) | FR2164377A5 (es) |
GB (1) | GB1328917A (es) |
IE (1) | IE37045B1 (es) |
ZA (1) | ZA727502B (es) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1406663A (en) * | 1972-08-22 | 1975-09-17 | Standard Telephones Cables Ltd | Telphone subset circuits |
NL7307296A (es) * | 1973-05-25 | 1974-11-27 | ||
US4031331A (en) * | 1976-01-15 | 1977-06-21 | Northern Electric Company Limited | Telephone speech network |
BE841105A (nl) * | 1976-04-26 | 1976-10-26 | Telekommunikatie toestel | |
JPS5356903A (en) * | 1976-11-02 | 1978-05-23 | Nippon Telegr & Teleph Corp <Ntt> | Automatic level control circuit for telephone set |
GB1546046A (en) * | 1976-12-03 | 1979-05-16 | Cselt Centro Studi Lab Telecom | Transmitting and receiving circuit for subscriber telephone sets |
US4071713A (en) * | 1976-12-27 | 1978-01-31 | Northern Telecom Limited | Telephone speech network |
JPS53105105A (en) * | 1977-02-24 | 1978-09-13 | San Terehon Kk | Semiconductor telephone set |
US4303805A (en) * | 1979-05-21 | 1981-12-01 | United Networks, Inc. | Subscriber station network |
US4400589A (en) * | 1979-05-21 | 1983-08-23 | United Networks, Inc. | Subscriber station network |
US4326109A (en) * | 1980-04-11 | 1982-04-20 | Northern Telecom Limited | Apparatus for coupling a two-way transmission path to a one-way transmitting path and a one-way receiving path |
DE3014187C2 (de) * | 1980-04-14 | 1983-11-17 | Nixdorf Computer Ag, 4790 Paderborn | Schaltungsanordnung zum zweidrähtigen Anschluß eines Fernsprechteilnehmers an je eine Leitung für angehende und ankommende Signale |
DE3019835C2 (de) * | 1980-05-23 | 1983-12-01 | Siemens AG, 1000 Berlin und 8000 München | Übertragerfreie Gabelschaltung |
GB8317706D0 (en) * | 1983-06-29 | 1983-08-03 | Standard Telephones Cables Ltd | Telephone subsets |
-
0
- BE BE792329D patent/BE792329A/xx not_active IP Right Cessation
-
1971
- 1971-12-09 GB GB5719671A patent/GB1328917A/en not_active Expired
-
1972
- 1972-10-19 IE IE1420/72A patent/IE37045B1/xx unknown
- 1972-10-23 ZA ZA727502A patent/ZA727502B/xx unknown
- 1972-11-21 US US00308799A patent/US3823272A/en not_active Expired - Lifetime
- 1972-11-23 AU AU49190/72A patent/AU473401B2/en not_active Expired
- 1972-12-01 CA CA158,410A patent/CA972887A/en not_active Expired
- 1972-12-07 DE DE2259993A patent/DE2259993A1/de active Pending
- 1972-12-07 ES ES409421A patent/ES409421A1/es not_active Expired
- 1972-12-08 FR FR7243689A patent/FR2164377A5/fr not_active Expired
- 1972-12-08 CH CH1787872A patent/CH557626A/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
US3823272A (en) | 1974-07-09 |
CA972887A (en) | 1975-08-12 |
GB1328917A (en) | 1973-09-05 |
FR2164377A5 (es) | 1973-07-27 |
CH557626A (de) | 1974-12-31 |
BE792329A (fr) | 1973-06-06 |
IE37045B1 (en) | 1977-04-27 |
DE2259993A1 (de) | 1973-06-14 |
ZA727502B (en) | 1973-07-25 |
AU4919072A (en) | 1974-05-23 |
IE37045L (en) | 1973-06-09 |
AU473401B2 (en) | 1976-06-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ES409421A1 (es) | Mejoras en los circuitos electronicos de aparato de abona- do. | |
GB1516751A (en) | Speech and data networks including circuits arranged to automatically control transmission continuity testing of connections | |
ES263736A1 (es) | Sistema telefënico | |
US3226492A (en) | Circuit arrangement for telephone instruments | |
CA944878A (en) | Supervisory circuit arrangement for telephone subscriber lines | |
ES450594A1 (es) | Un montaje para la seleccion directa de estaciones telefoni-cas. | |
GB787824A (en) | Improvements in or relating to circuits including electric signal transmission linesin communication systems | |
ES439298A1 (es) | Perfeccionamientos introducidos en las conexiones de insta- laciones de interfono, de intercomunicacion en duplex o de instalaciones de altavoces mandadas por pulsadores. | |
US1654645A (en) | Recording system | |
ES261154A1 (es) | Sistema de circuito telefënico de llamada de conferencia | |
FR1114855A (fr) | Termineur pour liaisons radiotéléphoniques, muni d'un circuit d'écoute | |
JPS5545299A (en) | Loudspeaker telephone circuit device controlled by voice for communication facility such as telephone facility | |
ES448685A1 (es) | Procedimiento y dispositivo para la eliminacion del efecto local de un puesto telefonico. | |
ES396581A1 (es) | Sistema intercomunicador telefonico. | |
FR2452215A1 (fr) | Appareil telephonique a haut-parleur | |
ES292377A3 (es) | Equipo automatico para grabaciën de comunicaciones telefënicas | |
ES300902A1 (es) | Un aparato intercomunicador transistorizado | |
JPS522309A (en) | Operator's communication system | |
ES449605A1 (es) | Un circuito para eliminar e efecto local en telefonos de abonado. | |
AU406551B2 (en) | Circuit arrangement for releasing audio frequency call signals in subscriber stations in communications, particularly telephone installations | |
ES279732A1 (es) | Un sistema de comunicaciones vocales interiores | |
JPS5373901A (en) | Voice trasmission system for date exchange | |
AU909166A (en) | Circuit arrangement for releasing audio frequency call signals in subscriber stations in communications, particularly telephone installations | |
JPS5329605A (en) | Hand-free telephone set | |
ES353727A1 (es) | Sistema de telefonia interior. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
FD1A | Patent lapsed |
Effective date: 19910207 |