IT1150308B - Perfezionamenti per apparecchi telefonici muniti di trasduttori ausiliari per consentire le conversazioni a viva voce - Google Patents

Perfezionamenti per apparecchi telefonici muniti di trasduttori ausiliari per consentire le conversazioni a viva voce

Info

Publication number
IT1150308B
IT1150308B IT20160/82A IT2016082A IT1150308B IT 1150308 B IT1150308 B IT 1150308B IT 20160/82 A IT20160/82 A IT 20160/82A IT 2016082 A IT2016082 A IT 2016082A IT 1150308 B IT1150308 B IT 1150308B
Authority
IT
Italy
Prior art keywords
telephone equipment
equipment equipped
allow hands
auxiliary transducers
free conversations
Prior art date
Application number
IT20160/82A
Other languages
English (en)
Other versions
IT8220160A0 (it
Inventor
Hyuk Yun Jin
Original Assignee
Gold Star Tele Electric
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 KR1019810000893A external-priority patent/KR820001745B1/ko
Priority claimed from KR1019810000892A external-priority patent/KR820001673B1/ko
Application filed by Gold Star Tele Electric filed Critical Gold Star Tele Electric
Publication of IT8220160A0 publication Critical patent/IT8220160A0/it
Application granted granted Critical
Publication of IT1150308B publication Critical patent/IT1150308B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • 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
IT20160/82A 1981-03-18 1982-03-15 Perfezionamenti per apparecchi telefonici muniti di trasduttori ausiliari per consentire le conversazioni a viva voce IT1150308B (it)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1019810000893A KR820001745B1 (ko) 1981-03-18 1981-03-18 스피커폰의 하이브리드 회로
KR1019810000892A KR820001673B1 (ko) 1981-03-18 1981-03-18 음성 스위칭 회로
KR1019810000894 1981-03-18

Publications (2)

Publication Number Publication Date
IT8220160A0 IT8220160A0 (it) 1982-03-15
IT1150308B true IT1150308B (it) 1986-12-10

Family

ID=27348287

Family Applications (1)

Application Number Title Priority Date Filing Date
IT20160/82A IT1150308B (it) 1981-03-18 1982-03-15 Perfezionamenti per apparecchi telefonici muniti di trasduttori ausiliari per consentire le conversazioni a viva voce

Country Status (4)

Country Link
US (1) US4507524A (it)
CA (1) CA1186826A (it)
GB (1) GB2096434B (it)
IT (1) IT1150308B (it)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2537810A1 (fr) * 1982-12-14 1984-06-15 Thomson Csf Poste telephonique a ecoute amplifiee muni d'un dispositif antilarsen
US4490582A (en) * 1983-02-18 1984-12-25 At&T Information Systems Inc. Speakerphone control circuit
US4497980A (en) * 1983-06-16 1985-02-05 Itt Corporation Handsfree circuit for telephone instrument
US4588859A (en) * 1983-08-02 1986-05-13 Zvie Liberman Two channel audio communication system
US4706274A (en) * 1984-05-11 1987-11-10 Southwestern Bell Telecommunications, Inc. Cordless telephone system
FR2578127A1 (fr) * 1985-02-27 1986-08-29 Jeumont Schneider Procede et dispositif pour la commande d'un poste telephonique a main libre fonctionnant en alternat
FI73341C (fi) * 1985-08-06 1987-09-10 Outel Oy Mellanfoerstaerkare som anvaends i tvaoledningsfoerbindelser i ett valbart telefonnaet samt foerfarande foer reglering av dess foerstaerkning.
FR2586878B1 (fr) * 1985-09-03 1987-11-13 Radiotechnique Compelec Poste telephonique muni d'une ecoute amplifiee et d'un dispositif anti-larsen.
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
GB8621758D0 (en) * 1986-09-10 1986-10-15 Cass Group Plc Call devices
FR2611408B1 (fr) * 1987-02-27 1989-05-26 Radiotechnique Compelec Circuit de commande d e gain d'un amplificateur d'ecoute par haut-parleur pour la suppression de l'effet larsen
FR2619980B1 (fr) * 1987-09-01 1992-05-29 Motorola Inc Bloc microphone haut-parleur avec mode de temps mort rapide
US4879745A (en) * 1988-10-12 1989-11-07 Ibm Corporation Half-duplex speakerphone
EP0423537B1 (de) * 1989-10-18 1995-03-01 Siemens Aktiengesellschaft Verfahren zur automatischen Sprachrichtungsumschaltung und Schaltungsanordnung zur Durchführung des Verfahrens
JP2634946B2 (ja) * 1990-11-19 1997-07-30 日本電気株式会社 ハンズフリー補助回路
US5357567A (en) * 1992-08-14 1994-10-18 Motorola, Inc. Method and apparatus for volume switched gain control
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
EP0776114A3 (fr) * 1995-11-22 1997-06-04 Laboratoires D'electronique Philips S.A.S. Appareil téléphonique avec volume réglable en fonction de bruit ambiant
US6901143B1 (en) * 1999-01-11 2005-05-31 Nec Corporation Voice switching system capable of improving a quality of conversation
US7006625B2 (en) * 2003-07-02 2006-02-28 Nvg, Inc. Cordless telephone-to-sound card interface adapter with hybrid transformer and control circuit
US6910447B1 (en) * 2003-10-31 2005-06-28 David Lee Azarian Pet communication apparatus
DE102008017231A1 (de) * 2008-04-04 2009-11-19 S. Siedle & Söhne Telefon- und Telegrafenwerke OHG Verfahren zum Betreiben einer Sende- und Empfangsvorrichtung und entsprechend ausgelegte Vorrichtung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3751602A (en) * 1971-08-13 1973-08-07 Bell Telephone Labor Inc Loudspeaking telephone
GB1406663A (en) * 1972-08-22 1975-09-17 Standard Telephones Cables Ltd Telphone subset circuits
US3833766A (en) * 1972-10-18 1974-09-03 Global Syst Design Corp Voiced controlled gain switched loud-speaking telephone system
SE365375B (it) * 1972-12-18 1974-03-18 Ericsson Telefon Ab L M
JPS5242643B2 (it) * 1973-10-18 1977-10-26
US4025728A (en) * 1976-01-29 1977-05-24 Sava Jacobson Speaker telephone
JPS5469308A (en) * 1977-11-14 1979-06-04 Toa Electric Co Ltd Audio switch
DE2840250C2 (de) * 1978-09-15 1983-01-20 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung für eine leitungsgespeiste Lautfernsprechstation
GB2064268B (en) * 1979-09-17 1983-10-26 Philips Nv Electronic signalling device for connection to a signal transmission line

Also Published As

Publication number Publication date
CA1186826A (en) 1985-05-07
US4507524A (en) 1985-03-26
GB2096434A (en) 1982-10-13
GB2096434B (en) 1985-04-03
IT8220160A0 (it) 1982-03-15

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