FR2363239A1 - Disposition de circuit pour un systeme telephonique d'interphone - Google Patents

Disposition de circuit pour un systeme telephonique d'interphone

Info

Publication number
FR2363239A1
FR2363239A1 FR7725805A FR7725805A FR2363239A1 FR 2363239 A1 FR2363239 A1 FR 2363239A1 FR 7725805 A FR7725805 A FR 7725805A FR 7725805 A FR7725805 A FR 7725805A FR 2363239 A1 FR2363239 A1 FR 2363239A1
Authority
FR
France
Prior art keywords
intercom
circuit arrangement
transmission
telephone system
transmission path
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.)
Withdrawn
Application number
FR7725805A
Other languages
English (en)
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
Application filed by Dasy Inter SA filed Critical Dasy Inter SA
Publication of FR2363239A1 publication Critical patent/FR2363239A1/fr
Withdrawn legal-status Critical Current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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/62—Constructional arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

Invention concernant le téléphone. Disposition de circuit pour système téléphonique d'interphone, dans lequel l'interphone proprement dit est constitué sous forme d'une installation de transmission de signaux fonctionnant dans les deux sens avec un canal d'émission commandé par le microphone de l'interphone et un canal de réception commandant le haut-parleur de l'interphone La tension de commande obtenue par le courant de conversation d'une direction de transmission est appliquée, conjointement avec la commande de l'élément d'amortissement de l'autre trajet de transmission, par l'intermédiaire d'un élément à retard et pour supprimer l'amortissement, à un élément d'amortissement supplémentaire situé avant l'amplificateur terminal du premier trajet de transmission. Application à un interphone fonctionnant en duplex.
FR7725805A 1976-08-25 1977-08-24 Disposition de circuit pour un systeme telephonique d'interphone Withdrawn FR2363239A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE762638286A DE2638286C3 (de) 1976-08-25 1976-08-25 Schaltungsanordnung für ein Freisprechertelefon

Publications (1)

Publication Number Publication Date
FR2363239A1 true FR2363239A1 (fr) 1978-03-24

Family

ID=5986356

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7725805A Withdrawn FR2363239A1 (fr) 1976-08-25 1977-08-24 Disposition de circuit pour un systeme telephonique d'interphone

Country Status (11)

Country Link
US (1) US4161624A (fr)
JP (1) JPS5327305A (fr)
AT (1) AT356717B (fr)
BE (1) BE858001A (fr)
CA (1) CA1083735A (fr)
CH (1) CH622917A5 (fr)
DE (1) DE2638286C3 (fr)
FR (1) FR2363239A1 (fr)
GB (1) GB1550721A (fr)
IT (1) IT1082614B (fr)
SE (1) SE415721B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2404355A1 (fr) * 1977-09-21 1979-04-20 Phoninter Sa Dispositif permettant d'amplifier ou de transmettre les signaux recus par un telephone et faisant office d'interphone
FR2409645A2 (fr) * 1977-11-16 1979-06-15 Dasy Int Sa Disposition de circuit pour un systeme telephonique d'interphone

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346261A (en) * 1980-03-17 1982-08-24 United Networks, Inc. Speaker phones
FR2481550B1 (fr) * 1980-04-25 1985-08-02 Trt Telecom Radio Electr Dispositif de protection contre l'effet larsen dans un poste telephonique a haut-parleur
US4378603A (en) * 1980-12-23 1983-03-29 Motorola, Inc. Radiotelephone with hands-free operation
DE3211184C2 (de) * 1981-03-31 1985-12-12 A. Grothe & Söhne KG, 5000 Köln Schaltungsanordnung für ein Freisprechtelefon
US4536888A (en) * 1981-08-21 1985-08-20 Plantronics, Inc. Voice communication instrument system with line-powered receiver conditioning circuit
GB2137049B (en) * 1983-03-15 1986-05-14 Standard Telephones Cables Ltd Handsfree telephone
DE3318742C2 (de) * 1983-05-21 1986-12-04 Krone Gmbh, 1000 Berlin Analoge automatische Sprachsteuerung, insbesondere für einen Fernsprechapparat mit einer Freisprecheinrichtung
CA1222293A (fr) * 1985-02-13 1987-05-26 David L. Lynch Circuit de compression lineaire automatique
JPH063950B2 (ja) * 1985-02-28 1994-01-12 株式会社東芝 拡声電話装置
US4715062A (en) * 1985-03-22 1987-12-22 Tie/Communications, Inc. Speakerphone control circuit having low gain states and method for controlling gain of speakerphone
GB2174578B (en) * 1985-05-04 1988-11-09 Stc Plc Loud speaking telephone
US4700382A (en) * 1986-03-03 1987-10-13 American Telephone And Telegraph Company, At&T Information Systems, Inc. Voice-switched telephone circuit with center idle state
US4724540A (en) * 1986-09-02 1988-02-09 Motorola, Inc. Speakerphone with fast idle mode
EP0264018A1 (fr) * 1986-09-30 1988-04-20 Siemens Aktiengesellschaft Procédé de réglage d'ampfification dans des appareils téléphoniques à circuit de parole électronique et dispositif pour sa mise en application
US4879746A (en) * 1987-12-30 1989-11-07 Plantronics, Inc. Voice communication link interface apparatus
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
US8077974B2 (en) 2006-07-28 2011-12-13 Hewlett-Packard Development Company, L.P. Compact stylus-based input technique for indic scripts

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1086753B (de) * 1958-04-28 1960-08-11 Ericsson Telefon Ab L M Sprachgesteuerte Wechselsprechanlage
DE2157709A1 (de) * 1970-11-27 1972-06-08 Ericsson Telefon Ab L M Steuerbares Dämpfungsglied
US3925618A (en) * 1974-05-02 1975-12-09 Nippon Telegraph & Telephone Voice switch circuits for use in loudspeaking telephone circuits

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850569A (en) * 1953-09-07 1958-09-02 Defensor A G Electric arrangement for speech transmission in two directions
JPS5337558Y2 (fr) * 1973-08-27 1978-09-12
NO134477C (fr) * 1974-10-29 1976-10-13 Manus Max

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1086753B (de) * 1958-04-28 1960-08-11 Ericsson Telefon Ab L M Sprachgesteuerte Wechselsprechanlage
DE2157709A1 (de) * 1970-11-27 1972-06-08 Ericsson Telefon Ab L M Steuerbares Dämpfungsglied
US3925618A (en) * 1974-05-02 1975-12-09 Nippon Telegraph & Telephone Voice switch circuits for use in loudspeaking telephone circuits

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2404355A1 (fr) * 1977-09-21 1979-04-20 Phoninter Sa Dispositif permettant d'amplifier ou de transmettre les signaux recus par un telephone et faisant office d'interphone
FR2409645A2 (fr) * 1977-11-16 1979-06-15 Dasy Int Sa Disposition de circuit pour un systeme telephonique d'interphone

Also Published As

Publication number Publication date
CA1083735A (fr) 1980-08-12
BE858001A (fr) 1977-12-16
DE2638286B2 (de) 1978-06-29
DE2638286C3 (de) 1979-03-01
AT356717B (de) 1980-05-27
SE7709497L (sv) 1978-02-26
DE2638286A1 (de) 1978-03-02
ATA605777A (de) 1979-10-15
IT1082614B (it) 1985-05-21
SE415721B (sv) 1980-10-20
JPS5327305A (en) 1978-03-14
GB1550721A (en) 1979-08-22
US4161624A (en) 1979-07-17
CH622917A5 (fr) 1981-04-30

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Legal Events

Date Code Title Description
ST Notification of lapse