IT1082614B - Circuito per un telefono a dialogo libero - Google Patents

Circuito per un telefono a dialogo libero

Info

Publication number
IT1082614B
IT1082614B IT12744/77A IT1274477A IT1082614B IT 1082614 B IT1082614 B IT 1082614B IT 12744/77 A IT12744/77 A IT 12744/77A IT 1274477 A IT1274477 A IT 1274477A IT 1082614 B IT1082614 B IT 1082614B
Authority
IT
Italy
Prior art keywords
phone
circuit
dialog
free
free dialog
Prior art date
Application number
IT12744/77A
Other languages
English (en)
Original Assignee
Dasy Int 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 Int Sa filed Critical Dasy Int Sa
Application granted granted Critical
Publication of IT1082614B publication Critical patent/IT1082614B/it

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)
IT12744/77A 1976-08-25 1977-08-23 Circuito per un telefono a dialogo libero IT1082614B (it)

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
IT1082614B true IT1082614B (it) 1985-05-21

Family

ID=5986356

Family Applications (1)

Application Number Title Priority Date Filing Date
IT12744/77A IT1082614B (it) 1976-08-25 1977-08-23 Circuito per un telefono a dialogo libero

Country Status (11)

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

Families Citing this family (19)

* 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
LU79026A1 (de) * 1977-11-16 1978-06-21 Dasy Int Sa Schaltungsanordnung fuer ein freisprechertelefon
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 (en) * 1985-02-13 1987-05-26 David L. Lynch Automatic linear compression circuit
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 (de) * 1986-09-30 1988-04-20 Siemens Aktiengesellschaft Verfahren zur Verstärkungsregelung in Fernsprechapparaten mit elektronischer Sprechschaltung und Vorrichtung zur Durchführung des Verfahrens
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

Family Cites Families (6)

* 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
DE1086753B (de) * 1958-04-28 1960-08-11 Ericsson Telefon Ab L M Sprachgesteuerte Wechselsprechanlage
GB1350142A (en) * 1970-11-27 1974-04-18 Ericsson Telefon Ab L M Controllable attenuator
JPS5337558Y2 (it) * 1973-08-27 1978-09-12
JPS5411203B2 (it) * 1974-05-02 1979-05-12
NO134477C (it) * 1974-10-29 1976-10-13 Manus Max

Also Published As

Publication number Publication date
DE2638286B2 (de) 1978-06-29
BE858001A (fr) 1977-12-16
FR2363239A1 (fr) 1978-03-24
GB1550721A (en) 1979-08-22
SE7709497L (sv) 1978-02-26
SE415721B (sv) 1980-10-20
CH622917A5 (it) 1981-04-30
JPS5327305A (en) 1978-03-14
ATA605777A (de) 1979-10-15
CA1083735A (en) 1980-08-12
DE2638286C3 (de) 1979-03-01
AT356717B (de) 1980-05-27
US4161624A (en) 1979-07-17
DE2638286A1 (de) 1978-03-02

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