FR2409645A2 - CIRCUIT ARRANGEMENT FOR AN INTERCOM TELEPHONE SYSTEM - Google Patents

CIRCUIT ARRANGEMENT FOR AN INTERCOM TELEPHONE SYSTEM

Info

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
Application number
FR7804396A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dasy Inter SA
Original Assignee
Dasy Inter SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE19772751248 external-priority patent/DE2751248C3/en
Priority claimed from DE19772751261 external-priority patent/DE2751261C3/en
Application filed by Dasy Inter SA filed Critical Dasy Inter SA
Publication of FR2409645A2 publication Critical patent/FR2409645A2/en
Pending legal-status Critical Current

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

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.INVENTION RELATING TO THE TELEPHONE. INTERCOM SYSTEM CONTAINING A TWO-WIRE CONNECTION LINE AND A SIGNAL TRANSMISSION SYSTEM OPERATING IN BOTH DIRECTIONS WITH A TRANSMISSION CHANNEL PILOT THROUGH THE INTERPHONE MICROPHONE AND A RECEPTION CHANNEL CONTROLLING THE SPEAKER OF THE INTERPHONE , EACH OF THE SAID CHANNELS INCLUDING PRE-AMPLIFIER STAGES AND TERMINAL AMPLIFIER STAGES AND A FIRST DAMPING ELEMENT BEING CONNECTED IN SERIES BEFORE THE PRE-AMPLIFIER STAGES AND A SECOND DAMPING ELEMENT, BEFORE THE AMPLIFIER STAGES, THESE TERMINAL CONTROLLERS AND SWITCHES. FROM THE CONTROL VOLTAGES DEDUCTED FROM THE CONVERSATION CURRENT OF EACH CHANNEL, THESE INTERCOM SYSTEM ALSO INCLUDES A DAMPING REDUCTION ELEMENT WHICH ACTS ON THE SECOND DAMPING ELEMENT OF THE SENDING CHANNEL. IN THE V1, V2, V3 EMISSION CHANNEL AT LEAST ONE DAMPING REDUCTION ELEMENT R3 IS ALSO ASSOCIATED WITH THE FIRST T0 DAMPING ELEMENT. APPLICATION TO AN INTERCOM OPERATING AS A PSEUDODUPLEX.

FR7804396A 1977-11-16 1978-02-16 CIRCUIT ARRANGEMENT FOR AN INTERCOM TELEPHONE SYSTEM Pending FR2409645A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19772751248 DE2751248C3 (en) 1977-11-16 1977-11-16 Circuit arrangement for a hands-free telephone
DE19772751261 DE2751261C3 (en) 1977-11-16 1977-11-16 Circuit arrangement for a hands-free telephone with automatic signal amplitude limitation

Publications (1)

Publication Number Publication Date
FR2409645A2 true FR2409645A2 (en) 1979-06-15

Family

ID=25773095

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7804396A Pending FR2409645A2 (en) 1977-11-16 1978-02-16 CIRCUIT ARRANGEMENT FOR AN INTERCOM TELEPHONE SYSTEM

Country Status (10)

Country Link
JP (1) JPS5472906A (en)
CH (1) CH626485A5 (en)
DK (1) DK74878A (en)
FI (1) FI780555A (en)
FR (1) FR2409645A2 (en)
GB (1) GB1568329A (en)
IT (1) IT1161440B (en)
LU (1) LU79026A1 (en)
NL (1) NL7801820A (en)
SE (1) SE7801902L (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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 (en) * 1993-05-25 1994-12-06 Exar Corp Speaker horn with phenomenon driving type control circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2508797A1 (en) * 1974-05-02 1975-11-06 Nippon Telegraph & Telephone VOICE SWITCH CIRCUIT FOR A SPEAKER TELEPHONE SWITCH
US4051325A (en) * 1975-01-31 1977-09-27 Matsushita Electric Industrial Co., Ltd. Speech intercommunication system
FR2363239A1 (en) * 1976-08-25 1978-03-24 Dasy Int Sa CIRCUIT ARRANGEMENT FOR AN INTERCOM TELEPHONE SYSTEM

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2508797A1 (en) * 1974-05-02 1975-11-06 Nippon Telegraph & Telephone VOICE SWITCH CIRCUIT FOR A SPEAKER TELEPHONE SWITCH
US4051325A (en) * 1975-01-31 1977-09-27 Matsushita Electric Industrial Co., Ltd. Speech intercommunication system
FR2363239A1 (en) * 1976-08-25 1978-03-24 Dasy Int Sa CIRCUIT ARRANGEMENT FOR AN INTERCOM TELEPHONE SYSTEM

Also Published As

Publication number Publication date
NL7801820A (en) 1979-05-18
IT7812485A0 (en) 1978-02-20
GB1568329A (en) 1980-05-29
LU79026A1 (en) 1978-06-21
FI780555A (en) 1979-05-17
DK74878A (en) 1979-05-17
SE7801902L (en) 1979-05-17
IT1161440B (en) 1987-03-18
JPS5472906A (en) 1979-06-11
CH626485A5 (en) 1981-11-13

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