CA978480A - Loudspeaking telephone station circuit - Google Patents

Loudspeaking telephone station circuit

Info

Publication number: CA978480A
Authority: CA; Canada
Prior art keywords: telephone station; station circuit; loudspeaking telephone; loudspeaking; circuit
Prior art date: 1972-03-21
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

CA166,531A

Other languages

English (en)

Other versions

CA166531S (en

Inventor

John Moniak

Ed Bridenbaugh

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.)

International Standard Electric Corp

Original Assignee

International 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

1975-11-25

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

1975-11-25 Application granted granted Critical

1975-11-25 Publication of CA978480A publication Critical patent/CA978480A/en

Status Expired legal-status Critical Current

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)

CA166,531A 1972-03-21 1973-03-20 Loudspeaking telephone station circuit Expired CA978480A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number	Publication Date
CA978480A true CA978480A (en)	1975-11-25

Family

ID=22890637

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA166,531A Expired CA978480A (en)	1972-03-21	1973-03-20	Loudspeaking telephone station circuit

Country Status (12)

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

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 (de) *	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 (de) *	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 (de) *	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
CN1141552A (zh) *	1995-05-31	1997-01-29	尾电话伴侣公司	软件扬声器电话系统与操作扬声器电话的方法
US5692042A (en) *	1995-05-31	1997-11-25	Casio Phonemate, Inc.	Speakerphone controlled by a comparator with hysteresis

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
SE311031B (de) *	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 IT IT21825/73A patent/IT982567B/it active
- 1973-03-20 JP JP48031547A patent/JPS5082907A/ja active Pending
- 1973-03-20 GB GB1337073A patent/GB1423577A/en not_active Expired
- 1973-03-20 NL NL7303906A patent/NL7303906A/xx unknown
- 1973-03-20 BR BR731951A patent/BR7301951D0/pt unknown
- 1973-03-20 AU AU53495/73A patent/AU5349573A/en not_active Expired
- 1973-03-20 CA CA166,531A patent/CA978480A/en not_active Expired
- 1973-03-21 FR FR7310145A patent/FR2177003A1/fr not_active Withdrawn
- 1973-03-21 BE BE2052616A patent/BE797074A/xx unknown
- 1973-03-21 ES ES412880A patent/ES412880A1/es not_active Expired

Also Published As

Publication number	Publication date
FR2177003A1 (de)	1973-11-02
GB1423577A (en)	1976-02-04
BR7301951D0 (pt)	1974-07-11
IT982567B (it)	1974-10-21
US3725585A (en)	1973-04-03
NL7303906A (de)	1973-09-25
AU5349573A (en)	1974-09-26
DE2313247A1 (de)	1973-10-04
ES412880A1 (es)	1975-12-16
BE797074A (nl)	1973-09-21
JPS5082907A (de)	1975-07-04

Publication	Publication Date	Title
CA978480A (en)	1975-11-25	Loudspeaking telephone station circuit
CA977479A (en)	1975-11-04	Telephone dialling arrangement
CA1026028A (en)	1978-02-07	Loudspeaking telephone circuit
CA971242A (en)	1975-07-15	Telephone type electrical connectors
CA1024279A (en)	1978-01-10	Electronic time-division-multiplexed pabx telephone system
CA982715A (en)	1976-01-27	Telephone subset circuit
AU5638273A (en)	1974-12-05	Line projector fora communication circuit
CA925233A (en)	1973-04-24	Subscriber telephone circuit
CA918322A (en)	1973-01-02	Communication call holding circuit
CA931648A (en)	1973-08-07	Telephone handset connector
CA970890A (en)	1975-07-08	Coin telephone circuit
CA949245A (en)	1974-06-11	Telephone subscriber line circuit
CA992228A (en)	1976-06-29	Key telephone line circuit
CA983185A (en)	1976-02-03	Automatic telephone answering apparatus
CA1000392A (en)	1976-11-23	Disconnect circuit for telephone systems
CA984983A (en)	1976-03-02	Telephone answering system
CA992679A (en)	1976-07-06	Electronic telephone trunk circuit
CA998150A (en)	1976-10-05	Telephone switching system
CA978289A (en)	1975-11-18	Call denial circuit
CA984041A (en)	1976-02-17	Mobile home telephone terminal system
CA984070A (en)	1976-02-17	Telephone switchhook with bi-directional operation
CA947444A (en)	1974-05-14	Telephone substation apparatus
AU470919B2 (en)	1976-04-01	Circuit arrangements for telephone charges indicators
CA938040A (en)	1973-12-04	Telephone subscriber line circuit
CA911580A (en)	1972-10-03	Telephone queuing circuit