FR2423097A1 - Dispositif de transmission electro-acoustique a postes multiples - Google Patents
Dispositif de transmission electro-acoustique a postes multiplesInfo
- Publication number
- FR2423097A1 FR2423097A1 FR7811104A FR7811104A FR2423097A1 FR 2423097 A1 FR2423097 A1 FR 2423097A1 FR 7811104 A FR7811104 A FR 7811104A FR 7811104 A FR7811104 A FR 7811104A FR 2423097 A1 FR2423097 A1 FR 2423097A1
- Authority
- FR
- France
- Prior art keywords
- principal
- secondary units
- units
- power amplifiers
- preamplifiers
- 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
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
Transmission électrique des sons. Le dispositif comprend un poste principal I et un nombre quelconque de postes secondaires III reliés au poste principal par une carte de sélection II. Tous les postes comportent un micro, un pré-amplificateur, un amplificateur de puissance et un haut-parleur identiques. Une ligne L1a relie la sortie des préamplificateurs par la carte II qui comporte des moyens de commutation pour la mise en état d'émission ou de réception de l'un ou de tous les postes secondaires. Transmission électro-acoustiques, interphones.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7811104A FR2423097A1 (fr) | 1978-04-14 | 1978-04-14 | Dispositif de transmission electro-acoustique a postes multiples |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7811104A FR2423097A1 (fr) | 1978-04-14 | 1978-04-14 | Dispositif de transmission electro-acoustique a postes multiples |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2423097A1 true FR2423097A1 (fr) | 1979-11-09 |
FR2423097B1 FR2423097B1 (fr) | 1980-10-10 |
Family
ID=9207168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7811104A Granted FR2423097A1 (fr) | 1978-04-14 | 1978-04-14 | Dispositif de transmission electro-acoustique a postes multiples |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2423097A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0175375A2 (fr) * | 1984-09-21 | 1986-03-26 | Kabushiki Kaisha Toshiba | Appareil téléphonique |
EP0271948A2 (fr) * | 1986-12-16 | 1988-06-22 | Alcatel N.V. | Circuit pour télécommunications |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2008000B1 (de) * | 1970-02-20 | 1971-05-06 | Philips Pat | Schaltungsanordnung für eine Wechsel- oder Gegensprechstelle |
-
1978
- 1978-04-14 FR FR7811104A patent/FR2423097A1/fr active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2008000B1 (de) * | 1970-02-20 | 1971-05-06 | Philips Pat | Schaltungsanordnung für eine Wechsel- oder Gegensprechstelle |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0175375A2 (fr) * | 1984-09-21 | 1986-03-26 | Kabushiki Kaisha Toshiba | Appareil téléphonique |
EP0175375A3 (fr) * | 1984-09-21 | 1987-12-02 | Kabushiki Kaisha Toshiba | Appareil téléphonique |
EP0271948A2 (fr) * | 1986-12-16 | 1988-06-22 | Alcatel N.V. | Circuit pour télécommunications |
EP0271948A3 (fr) * | 1986-12-16 | 1989-05-03 | Alcatel N.V. | Circuit pour télécommunications |
Also Published As
Publication number | Publication date |
---|---|
FR2423097B1 (fr) | 1980-10-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |