FR2357122A1 - Dispositif electrique de numerotation decimale a clavier - Google Patents
Dispositif electrique de numerotation decimale a clavierInfo
- Publication number
- FR2357122A1 FR2357122A1 FR7620354A FR7620354A FR2357122A1 FR 2357122 A1 FR2357122 A1 FR 2357122A1 FR 7620354 A FR7620354 A FR 7620354A FR 7620354 A FR7620354 A FR 7620354A FR 2357122 A1 FR2357122 A1 FR 2357122A1
- Authority
- FR
- France
- Prior art keywords
- keyboard
- dialling
- integrated circuits
- telephone
- circuit
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
- H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits
Abstract
a. Dispositif électronique de numérotation décimale à clavier à touches pour poste téléphonique. b. Il comprend au moins un circuit intégré commandé par les touches et produisant des trains d'impulsions de munérotation, le nombre d'impulsions dans le train dépendant de la touche enfoncée, un transistor de numérotation en série sur l'un des fils de ligne, un chemin de conversation comprenant un transistor de commutation et un chemin d'alimentation comprenant un condensateur d'alimentation du circuit intégré et des moyens de bloquer le transistor de commutation du chemin de conversation pendant un court délai suivant le décrochage et pendant des signaux d'enveloppe des impulsions de numérotation et les débordant d'une durée déterminée, produits par le circuit intégré. c. Téléphonie automatique.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7620354A FR2357122A1 (fr) | 1976-07-02 | 1976-07-02 | Dispositif electrique de numerotation decimale a clavier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7620354A FR2357122A1 (fr) | 1976-07-02 | 1976-07-02 | Dispositif electrique de numerotation decimale a clavier |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2357122A1 true FR2357122A1 (fr) | 1978-01-27 |
FR2357122B1 FR2357122B1 (fr) | 1981-07-31 |
Family
ID=9175205
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7620354A Granted FR2357122A1 (fr) | 1976-07-02 | 1976-07-02 | Dispositif electrique de numerotation decimale a clavier |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2357122A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0023695A1 (fr) * | 1979-08-02 | 1981-02-11 | Siemens Aktiengesellschaft | Circuit de surveillance d'une tension d'entrée |
FR2471704A1 (fr) * | 1979-12-13 | 1981-06-19 | Thomson Csf Mat Tel | Dispositif d'envoi de signalisation pour postes et terminaux telephoniques |
-
1976
- 1976-07-02 FR FR7620354A patent/FR2357122A1/fr active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0023695A1 (fr) * | 1979-08-02 | 1981-02-11 | Siemens Aktiengesellschaft | Circuit de surveillance d'une tension d'entrée |
FR2471704A1 (fr) * | 1979-12-13 | 1981-06-19 | Thomson Csf Mat Tel | Dispositif d'envoi de signalisation pour postes et terminaux telephoniques |
Also Published As
Publication number | Publication date |
---|---|
FR2357122B1 (fr) | 1981-07-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |