IT982567B - Circuito per apparecchio telefoni co ad altoparlante - Google Patents

Circuito per apparecchio telefoni co ad altoparlante

Info

Publication number: IT982567B
Authority: IT; Italy
Prior art keywords: telephone; circuit; speaker device; speaker
Prior art date: 1972-03-21

Application number

IT21825/73A

Other languages

English (en)

Italian (it)

Original Assignee

Int Standard Electric Corp

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.)

1972-03-21

Filing date

1973-03-20

Publication date

1974-10-21

1973-03-20 Application filed by Int Standard Electric Corp filed Critical Int Standard Electric Corp

1974-10-21 Application granted granted Critical

1974-10-21 Publication of IT982567B publication Critical patent/IT982567B/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

Landscapes

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

IT21825/73A 1972-03-21 1973-03-20 Circuito per apparecchio telefoni co ad altoparlante IT982567B (it)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US23671472A	1972-03-21	1972-03-21

Publications (1)

Publication Number	Publication Date
IT982567B true IT982567B (it)	1974-10-21

Family

ID=22890637

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
IT21825/73A IT982567B (it)	1972-03-21	1973-03-20	Circuito per apparecchio telefoni co ad altoparlante

Country Status (12)

Country	Link
US (1)	US3725585A (2)
JP (1)	JPS5082907A (2)
AU (1)	AU5349573A (2)
BE (1)	BE797074A (2)
BR (1)	BR7301951D0 (2)
CA (1)	CA978480A (2)
DE (1)	DE2313247A1 (2)
ES (1)	ES412880A1 (2)
FR (1)	FR2177003A1 (2)
GB (1)	GB1423577A (2)
IT (1)	IT982567B (2)
NL (1)	NL7303906A (2)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB1406243A (en) *	1971-10-28	1975-09-17	Gen Electric Co Ltd	Loudspeaking telephone instruments
US3860756A (en) *	1973-03-23	1975-01-14	Nitsuko Ltd	Automatic voice-path switching circuit for a speaker phone telephone set
US3889059A (en) *	1973-03-26	1975-06-10	Northern Electric Co	Loudspeaking communication terminal apparatus and method of operation
JPS49123706A (2) *	1973-03-30	1974-11-27
US3909548A (en) *	1973-12-07	1975-09-30	Jacobson Sava	Speaker telephone
US4028506A (en) *	1973-12-12	1977-06-07	Nippon Electric Company, Ltd.	Maximum value tracing circuit for digitized voice signals
JPS5411203B2 (2) *	1974-05-02	1979-05-12
US3963868A (en) *	1974-06-27	1976-06-15	Stromberg-Carlson Corporation	Loudspeaking telephone hysteresis and ambient noise control
US3970786A (en) *	1974-06-27	1976-07-20	Stromberg-Carlson Corporation	Loudspeaking telephone with improved receive sensitivity
ZA755743B (en) *	1974-09-27	1976-08-25	Gen Electric	Improvements in or relating to loudspeaking telephone instruments
NO134477C (2) *	1974-10-29	1976-10-13	Manus Max
US3953676A (en) *	1974-12-12	1976-04-27	Northern Electric Company, Limited	Digital control of a loudspeaking telephone system
CA1058340A (en) *	1975-06-30	1979-07-10	International Standard Electric Corporation	Two-way loudspeaking device for telephone stations
US4115658A (en) *	1977-04-11	1978-09-19	Williams Richard W	Two way telephone amplifier
US4115659A (en) *	1977-06-16	1978-09-19	Abram N. Spanel	Electroacoustical telephone adapter
DE2842369A1 (de) *	1978-09-28	1980-04-10	Siemens Ag	Schaltungsanordnung fuer eine sprachgesteuerte lautfernsprechstation in fernmelde-, insbesondere fernsprechanlagen
IL63653A (en) *	1980-08-29	1984-05-31	Western Electric Co	Line powered transformer-less loudspeaking telephone
US4378603A (en) *	1980-12-23	1983-03-29	Motorola, Inc.	Radiotelephone with hands-free operation
US4536888A (en) *	1981-08-21	1985-08-20	Plantronics, Inc.	Voice communication instrument system with line-powered receiver conditioning circuit
US4763349A (en) *	1981-12-31	1988-08-09	Howard Siegel	Monitoring apparatus using telephone link
US4400584A (en) *	1982-04-05	1983-08-23	Motorola, Inc.	Speakerphone for radio and, landline telephones
US4490582A (en) *	1983-02-18	1984-12-25	At&T Information Systems Inc.	Speakerphone control circuit
JPS6412649A (en) *	1987-07-06	1989-01-17	Nec Corp	Variable gain circuit for loudspeaker telephone set
US4786329A (en) *	1987-09-09	1988-11-22	The Dow Chemical Company	Asphalt compositions containing anti-stripping additives prepared from amines or polyamines and phosphonates
US4879746A (en) *	1987-12-30	1989-11-07	Plantronics, Inc.	Voice communication link interface apparatus
US4959857A (en) *	1988-12-28	1990-09-25	At&T Bell Laboratories	Acoustic calibration arrangement for a voice switched speakerphone
US5187741A (en) *	1990-11-30	1993-02-16	At&T Bell Laboratories	Enhanced acoustic calibration procedure for a voice switched speakerphone
US5594784A (en) *	1993-04-27	1997-01-14	Southwestern Bell Technology Resources, Inc.	Apparatus and method for transparent telephony utilizing speech-based signaling for initiating and handling calls
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
US5649008A (en) *	1994-08-02	1997-07-15	Motorola, Inc.	Circuit and method of reducing sidetone in a receive signal path
US5692042A (en) *	1995-05-31	1997-11-25	Casio Phonemate, Inc.	Speakerphone controlled by a comparator with hysteresis
GB2301731B (en) *	1995-05-31	1998-09-02	Casio Phonemate Inc	Speakerphone, speakerphone system and method of operating a speakerphone

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
SE311031B (2) *	1965-12-16	1969-05-27	Ericsson Telefon Ab L M
US3562791A (en) *	1967-12-07	1971-02-09	Int Standard Electric Corp	Loudspeaker telephone circuit arrangement

1972
- 1972-03-21 US US00236714A patent/US3725585A/en not_active Expired - Lifetime
1973
- 1973-03-16 DE DE2313247A patent/DE2313247A1/de active Pending
- 1973-03-20 BR BR731951A patent/BR7301951D0/pt unknown
- 1973-03-20 AU AU53495/73A patent/AU5349573A/en not_active Expired
- 1973-03-20 GB GB1337073A patent/GB1423577A/en not_active Expired
- 1973-03-20 JP JP48031547A patent/JPS5082907A/ja active Pending
- 1973-03-20 IT IT21825/73A patent/IT982567B/it active
- 1973-03-20 NL NL7303906A patent/NL7303906A/xx unknown
- 1973-03-20 CA CA166,531A patent/CA978480A/en not_active Expired
- 1973-03-21 BE BE2052616A patent/BE797074A/xx unknown
- 1973-03-21 ES ES412880A patent/ES412880A1/es not_active Expired
- 1973-03-21 FR FR7310145A patent/FR2177003A1/fr not_active Withdrawn

Also Published As

Publication number	Publication date
US3725585A (en)	1973-04-03
JPS5082907A (2)	1975-07-04
FR2177003A1 (2)	1973-11-02
BE797074A (nl)	1973-09-21
GB1423577A (en)	1976-02-04
BR7301951D0 (pt)	1974-07-11
NL7303906A (2)	1973-09-25
CA978480A (en)	1975-11-25
DE2313247A1 (de)	1973-10-04
ES412880A1 (es)	1975-12-16
AU5349573A (en)	1974-09-26

Publication	Publication Date	Title
IT982567B (it)	1974-10-21	Circuito per apparecchio telefoni co ad altoparlante
NL186058C (nl)	1990-09-03	Microfooninrichting.
SE404645B (sv)	1978-10-16	Hogtalaranordning
NL7512558A (nl)	1976-05-04	Stereomicrofooninrichting.
BE801282A (fr)	1973-12-26	Casque telephonique
DK150779C (da)	1987-11-02	Retningsfoelsomt hoereapparat
AT339970B (de)	1977-11-25	Wiedergabegerat
IT987490B (it)	1975-02-20	Dispositivo auricolare d ascolto
NL7605997A (nl)	1976-12-08	Geluidsweergaveinrichting.
BR7304182D0 (pt)	1974-07-11	Circuito amplificador de transistor
IT1002335B (it)	1976-05-20	Apparecchio telefonico con rice zione amplificata
IT951745B (it)	1973-07-10	Dispositivo per videotelefono
NL7507209A (nl)	1976-02-25	Verrespreektoestel.
BR7305734D0 (pt)	1974-08-29	Aparelho de interrupcao de circuito
IT1015437B (it)	1977-05-10	Dispositivo riproduttore elettro fotografico
NL7512557A (nl)	1976-05-04	Microfooninrichting.
BR7308817D0 (pt)	1974-08-29	Circuito amplificador
IT1003169B (it)	1976-06-10	Circuito di amplificazione
IT979129B (it)	1974-09-30	Circuito di arresto di soneria
IT977696B (it)	1974-09-20	Circuito elettrico per apparecchi telefonici
NL7500811A (nl)	1975-08-04	Geluidsbeschermingsinrichting.
IT996380B (it)	1975-12-10	Circuito per un apparecchio con possibilita di riproduzione del suono
NL7502223A (nl)	1975-09-03	Luidsprekerinrichting.
AT317680B (de)	1974-09-10	Wiedergabeeinrichtung
BR7303046D0 (pt)	1974-07-11	Circuito amplificador simetrico