DE2638286C3 - Schaltungsanordnung für ein Freisprechertelefon - Google Patents

Schaltungsanordnung für ein Freisprechertelefon

Info

Publication number
DE2638286C3
DE2638286C3 DE762638286A DE2638286A DE2638286C3 DE 2638286 C3 DE2638286 C3 DE 2638286C3 DE 762638286 A DE762638286 A DE 762638286A DE 2638286 A DE2638286 A DE 2638286A DE 2638286 C3 DE2638286 C3 DE 2638286C3
Authority
DE
Germany
Prior art keywords
attenuator
channel
circuit arrangement
arrangement according
amplifier
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.)
Expired
Application number
DE762638286A
Other languages
German (de)
English (en)
Other versions
DE2638286B2 (de
DE2638286A1 (de
Inventor
Joergen Hof Brosow (Oesterreich)
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 Genf (schweiz)
Original Assignee
Dasy Inter Sa Genf (schweiz)
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 Genf (schweiz) filed Critical Dasy Inter Sa Genf (schweiz)
Priority to DE762638286A priority Critical patent/DE2638286C3/de
Priority to CA285,023A priority patent/CA1083735A/en
Priority to AT605777A priority patent/AT356717B/de
Priority to BE180343A priority patent/BE858001A/xx
Priority to GB35322/77A priority patent/GB1550721A/en
Priority to IT12744/77A priority patent/IT1082614B/it
Priority to FR7725805A priority patent/FR2363239A1/fr
Priority to JP10066277A priority patent/JPS5327305A/ja
Priority to SE7709497A priority patent/SE415721B/xx
Priority to CH1041777A priority patent/CH622917A5/de
Priority to US05/827,752 priority patent/US4161624A/en
Publication of DE2638286A1 publication Critical patent/DE2638286A1/de
Publication of DE2638286B2 publication Critical patent/DE2638286B2/de
Application granted granted Critical
Publication of DE2638286C3 publication Critical patent/DE2638286C3/de
Expired 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)
DE762638286A 1976-08-25 1976-08-25 Schaltungsanordnung für ein Freisprechertelefon Expired DE2638286C3 (de)

Priority Applications (11)

Application Number Priority Date Filing Date Title
DE762638286A DE2638286C3 (de) 1976-08-25 1976-08-25 Schaltungsanordnung für ein Freisprechertelefon
CA285,023A CA1083735A (en) 1976-08-25 1977-08-19 Control circuit for hands-free telephone
AT605777A AT356717B (de) 1976-08-25 1977-08-22 Schaltungsanordnung fuer ein freisprechertelefon
BE180343A BE858001A (fr) 1976-08-25 1977-08-22 Disposition de circuit pour un systeme telephonique d'interphone
IT12744/77A IT1082614B (it) 1976-08-25 1977-08-23 Circuito per un telefono a dialogo libero
GB35322/77A GB1550721A (en) 1976-08-25 1977-08-23 Circuit arrangement for a loudspeaking telephone
FR7725805A FR2363239A1 (fr) 1976-08-25 1977-08-24 Disposition de circuit pour un systeme telephonique d'interphone
JP10066277A JPS5327305A (en) 1976-08-25 1977-08-24 Circuit configuration for open telephone
SE7709497A SE415721B (sv) 1976-08-25 1977-08-24 Kopplingsanordning for en hogtalartelefon
CH1041777A CH622917A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1976-08-25 1977-08-25
US05/827,752 US4161624A (en) 1976-08-25 1977-08-25 Hands-free telephone with cascaded attenuators

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 (3)

Publication Number Publication Date
DE2638286A1 DE2638286A1 (de) 1978-03-02
DE2638286B2 DE2638286B2 (de) 1978-06-29
DE2638286C3 true DE2638286C3 (de) 1979-03-01

Family

ID=5986356

Family Applications (1)

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

Country Status (11)

Country Link
US (1) US4161624A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS5327305A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AT (1) AT356717B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE858001A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA1083735A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CH (1) CH622917A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2638286C3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2363239A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1550721A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT1082614B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE415721B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

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
JPS6390951A (ja) * 1986-09-30 1988-04-21 シーメンス、アクチエンゲゼルシヤフト 電話装置用の利得制御方法および装置
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 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1973-08-27 1978-09-12
JPS5411203B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1974-05-02 1979-05-12
NO134477C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1974-10-29 1976-10-13 Manus Max

Also Published As

Publication number Publication date
CA1083735A (en) 1980-08-12
SE7709497L (sv) 1978-02-26
FR2363239A1 (fr) 1978-03-24
IT1082614B (it) 1985-05-21
AT356717B (de) 1980-05-27
DE2638286B2 (de) 1978-06-29
US4161624A (en) 1979-07-17
CH622917A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1981-04-30
SE415721B (sv) 1980-10-20
BE858001A (fr) 1977-12-16
GB1550721A (en) 1979-08-22
DE2638286A1 (de) 1978-03-02
JPS5327305A (en) 1978-03-14
ATA605777A (de) 1979-10-15

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Legal Events

Date Code Title Description
OAP Request for examination filed
OD Request for examination
C3 Grant after two publication steps (3rd publication)
8339 Ceased/non-payment of the annual fee