FR2409645A2 - Disposition de circuit pour un systeme telephonique d'interphone - Google Patents
Disposition de circuit pour un systeme telephonique d'interphoneInfo
- Publication number
- FR2409645A2 FR2409645A2 FR7804396A FR7804396A FR2409645A2 FR 2409645 A2 FR2409645 A2 FR 2409645A2 FR 7804396 A FR7804396 A FR 7804396A FR 7804396 A FR7804396 A FR 7804396A FR 2409645 A2 FR2409645 A2 FR 2409645A2
- Authority
- FR
- France
- Prior art keywords
- channel
- amplifier stages
- damping
- damping element
- intercom
- 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.)
- Pending
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
- H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
INVENTION CONCERNANT LE TELEPHONE. SYSTEME D'INTERPHONE COMPORTANT UNE LIGNE DE RACCORDEMENT BIFILAIRE ET UNE INSTALLATION DE TRANSMISSION DES SIGNAUX FONCTIONNANT DANS LES DEUX SENS AVEC UN CANAL D'EMISSION PILOTE PAR LE MICROPHONE DE L'INTERPHONE ET UN CANAL DE RECEPTION PILOTANT LE HAUT-PARLEUR DE L'INTERPHONE, CHACUN DESDITS CANAUX COMPORTANT DES ETAGES PREAMPLIFICATEURS ET DES ETAGES AMPLIFICATEURS TERMINAUX ET UN PREMIER ELEMENT D'AMORTISSEMENT ETANT BRANCHE EN SERIE AVANT LES ETAGES PREAMPLIFICATEURS ET UN DEUXIEME ELEMENT D'AMORTISSEMENT, AVANT LES ETAGES AMPLIFICATEURS TERMINAUX, CES ELEMENTS D'AMORTISSEMENT ETANT COMMANDES PAR DES TENSIONS DE COMMANDE DEDUITES DU COURANT DE CONVERSATION DE CHAQUE CANAL, LEDIT SYSTEME D'INTERPHONE COMPORTANT EGALEMENT UN ELEMENT DE REDUCTION D'AMORTISSEMENT QUI AGIT SUR LE DEUXIEME ELEMENT D'AMORTISSEMENT DU CANAL D'EMISSION. DANS LE CANAL D'EMISSION V1, V2, V3 AU MOINS UN ELEMENT DE REDUCTION D'AMORTISSEMENT R3 EST ASSOCIE EN OUTRE AU PREMIER ELEMENT D'AMORTISSEMENT T0. APPLICATION A UN INTERPHONE FONCTIONNANT EN PSEUDODUPLEX.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19772751248 DE2751248C3 (de) | 1977-11-16 | 1977-11-16 | Schaltungsanordnung für ein Freisprechertelefon |
DE19772751261 DE2751261C3 (de) | 1977-11-16 | 1977-11-16 | Schaltungsanordnung für ein Freisprechertelefon mit selbsttätiger Signalamplitudenbegrenzung |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2409645A2 true FR2409645A2 (fr) | 1979-06-15 |
Family
ID=25773095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7804396A Pending FR2409645A2 (fr) | 1977-11-16 | 1978-02-16 | Disposition de circuit pour un systeme telephonique d'interphone |
Country Status (10)
Country | Link |
---|---|
JP (1) | JPS5472906A (fr) |
CH (1) | CH626485A5 (fr) |
DK (1) | DK74878A (fr) |
FI (1) | FI780555A (fr) |
FR (1) | FR2409645A2 (fr) |
GB (1) | GB1568329A (fr) |
IT (1) | IT1161440B (fr) |
LU (1) | LU79026A1 (fr) |
NL (1) | NL7801820A (fr) |
SE (1) | SE7801902L (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8317706D0 (en) * | 1983-06-29 | 1983-08-03 | Standard Telephones Cables Ltd | Telephone subsets |
US4724540A (en) * | 1986-09-02 | 1988-02-09 | Motorola, Inc. | Speakerphone with fast idle mode |
JPH06338934A (ja) * | 1993-05-25 | 1994-12-06 | Exar Corp | 事象駆動型制御回路を有するスピーカーホーン |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2508797A1 (de) * | 1974-05-02 | 1975-11-06 | Nippon Telegraph & Telephone | Sprachschalterkreis fuer eine lautsprecher-fernsprechschaltung |
US4051325A (en) * | 1975-01-31 | 1977-09-27 | Matsushita Electric Industrial Co., Ltd. | Speech intercommunication system |
FR2363239A1 (fr) * | 1976-08-25 | 1978-03-24 | Dasy Int Sa | Disposition de circuit pour un systeme telephonique d'interphone |
-
1978
- 1978-02-08 LU LU79026A patent/LU79026A1/de unknown
- 1978-02-16 FR FR7804396A patent/FR2409645A2/fr active Pending
- 1978-02-16 GB GB6251/78A patent/GB1568329A/en not_active Expired
- 1978-02-17 NL NL7801820A patent/NL7801820A/xx not_active Application Discontinuation
- 1978-02-20 JP JP1840878A patent/JPS5472906A/ja active Pending
- 1978-02-20 SE SE7801902A patent/SE7801902L/xx unknown
- 1978-02-20 IT IT12485/78A patent/IT1161440B/it active
- 1978-02-20 DK DK74878A patent/DK74878A/da not_active Application Discontinuation
- 1978-02-20 CH CH182478A patent/CH626485A5/de not_active IP Right Cessation
- 1978-02-20 FI FI780555A patent/FI780555A/fi unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2508797A1 (de) * | 1974-05-02 | 1975-11-06 | Nippon Telegraph & Telephone | Sprachschalterkreis fuer eine lautsprecher-fernsprechschaltung |
US4051325A (en) * | 1975-01-31 | 1977-09-27 | Matsushita Electric Industrial Co., Ltd. | Speech intercommunication system |
FR2363239A1 (fr) * | 1976-08-25 | 1978-03-24 | Dasy Int Sa | Disposition de circuit pour un systeme telephonique d'interphone |
Also Published As
Publication number | Publication date |
---|---|
IT1161440B (it) | 1987-03-18 |
IT7812485A0 (it) | 1978-02-20 |
CH626485A5 (en) | 1981-11-13 |
JPS5472906A (en) | 1979-06-11 |
NL7801820A (nl) | 1979-05-18 |
SE7801902L (sv) | 1979-05-17 |
GB1568329A (en) | 1980-05-29 |
LU79026A1 (de) | 1978-06-21 |
DK74878A (da) | 1979-05-17 |
FI780555A (fi) | 1979-05-17 |
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