CA996692A - Digital control of a loudspeaking telephone system - Google Patents

Digital control of a loudspeaking telephone system

Info

Publication number: CA996692A
Authority: CA; Canada
Prior art keywords: digital control; telephone system; loudspeaking telephone; loudspeaking; digital
Prior art date: 1974-12-12
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

CA215,876A

Other versions

CA215876S (en

Inventor

Russell W. Brown

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.)

Nortel Networks Ltd

Original Assignee

Northern Electric Co Ltd

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.)

1974-12-12

Filing date

1974-12-12

Publication date

1976-09-07

1974-12-12 Application filed by Northern Electric Co Ltd filed Critical Northern Electric Co Ltd

1974-12-12 Priority to CA215,876A priority Critical patent/CA996692A/en

1975-12-04 Priority to NL7514138A priority patent/NL7514138A/en

1975-12-05 Priority to GB50016/75A priority patent/GB1519607A/en

1975-12-09 Priority to IT30127/75A priority patent/IT1050035B/en

1975-12-10 Priority to JP50146495A priority patent/JPS5183709A/ja

1975-12-10 Priority to DE19752555552 priority patent/DE2555552A1/en

1975-12-11 Priority to NO754207A priority patent/NO754207L/no

1975-12-11 Priority to SE7514036A priority patent/SE414856B/en

1975-12-12 Priority to FR7538184A priority patent/FR2294595A1/en

1976-09-07 Application granted granted Critical

1976-09-07 Publication of CA996692A publication Critical patent/CA996692A/en

Status 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
- H04M9/085—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using digital techniques

Landscapes

Engineering & Computer Science (AREA)
Signal Processing (AREA)
Control Of Amplification And Gain Control (AREA)
Analogue/Digital Conversion (AREA)
Transceivers (AREA)
Interconnected Communication Systems, Intercoms, And Interphones (AREA)

CA215,876A 1974-12-12 1974-12-12 Digital control of a loudspeaking telephone system Expired CA996692A (en)

Priority Applications (9)

Application Number	Priority Date	Filing Date	Title
CA215,876A CA996692A (en)	1974-12-12	1974-12-12	Digital control of a loudspeaking telephone system
NL7514138A NL7514138A (en)	1974-12-12	1975-12-04	SPEAKING TELEPHONE SYSTEM.
GB50016/75A GB1519607A (en)	1974-12-12	1975-12-05	Digital control of a loudspeaking telephone system
IT30127/75A IT1050035B (en)	1974-12-12	1975-12-09	DIGITAL CONTROL SPEAKER TELEPHONE SYSTEM
JP50146495A JPS5183709A (en)	1974-12-12	1975-12-10
DE19752555552 DE2555552A1 (en)	1974-12-12	1975-12-10	DIGITAL CONTROL FOR A LOUDSPEAKER SYSTEM
NO754207A NO754207L (en)	1974-12-12	1975-12-11
SE7514036A SE414856B (en)	1974-12-12	1975-12-11	SPEAKING PHONE SYSTEM
FR7538184A FR2294595A1 (en)	1974-12-12	1975-12-12	HANDS-FREE TELEPHONE SYSTEM WITH DIGITAL CONTROL

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
CA215,876A CA996692A (en)	1974-12-12	1974-12-12	Digital control of a loudspeaking telephone system

Publications (1)

Publication Number	Publication Date
CA996692A true CA996692A (en)	1976-09-07

Family

ID=4101835

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA215,876A Expired CA996692A (en)	1974-12-12	1974-12-12	Digital control of a loudspeaking telephone system

Country Status (9)

Country	Link
JP (1)	JPS5183709A (en)
CA (1)	CA996692A (en)
DE (1)	DE2555552A1 (en)
FR (1)	FR2294595A1 (en)
GB (1)	GB1519607A (en)
IT (1)	IT1050035B (en)
NL (1)	NL7514138A (en)
NO (1)	NO754207L (en)
SE (1)	SE414856B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE2659028C3 (en) *	1976-12-27	1979-05-31	Dasy Inter S.A., Genf (Schweiz)	Circuit arrangement for preventing feedback
DE2952122A1 (en) *	1979-12-22	1981-06-25	Deutsche Itt Industries Gmbh, 7800 Freiburg	Speech controlled telephonic communication channel - employing digital filters and comparators to set reception and transmission channel damping
JPS5797262A (en) *	1980-12-09	1982-06-16	Nippon Telegr & Teleph Corp <Ntt>	Loud speaker telephone set system
GB2137458B (en) *	1983-03-01	1986-11-19	Standard Telephones Cables Ltd	Digital handsfree telephone
GB2161047B (en) *	1984-06-28	1987-09-16	Stc Plc	Improvements in telephone instruments
GB2174578B (en) *	1985-05-04	1988-11-09	Stc Plc	Loud speaking telephone
GB2197166A (en) *	1986-11-07	1988-05-11	Storno As	Controlling gain in speech-controlled telephones
EP0271948A3 (en) *	1986-12-16	1989-05-03	Alcatel N.V.	Telecommunication circuit
DE4130045A1 (en) *	1991-09-10	1993-03-18	Standard Elektrik Lorenz Ag	CIRCUIT ARRANGEMENT FOR THE DYNAMIC CONTROL OF A VOICE TERMINAL

1974
- 1974-12-12 CA CA215,876A patent/CA996692A/en not_active Expired
1975
- 1975-12-04 NL NL7514138A patent/NL7514138A/en not_active Application Discontinuation
- 1975-12-05 GB GB50016/75A patent/GB1519607A/en not_active Expired
- 1975-12-09 IT IT30127/75A patent/IT1050035B/en active
- 1975-12-10 JP JP50146495A patent/JPS5183709A/ja active Pending
- 1975-12-10 DE DE19752555552 patent/DE2555552A1/en not_active Withdrawn
- 1975-12-11 SE SE7514036A patent/SE414856B/en unknown
- 1975-12-11 NO NO754207A patent/NO754207L/no unknown
- 1975-12-12 FR FR7538184A patent/FR2294595A1/en not_active Withdrawn

Also Published As

Publication number	Publication date
NO754207L (en)	1976-06-15
NL7514138A (en)	1976-06-15
GB1519607A (en)	1978-08-02
JPS5183709A (en)	1976-07-22
DE2555552A1 (en)	1976-06-16
SE7514036L (en)	1976-06-14
FR2294595A1 (en)	1976-07-09
IT1050035B (en)	1981-03-10
SE414856B (en)	1980-08-18

Similar Documents

Publication	Publication Date	Title
AU489807B2 (en)	1976-01-08	Auxiliary telephone network
AU500733B2 (en)	1979-05-31	Multistation telephone switching system
CA1027271A (en)	1978-02-28	Automatic telephone caller
CA996692A (en)	1976-09-07	Digital control of a loudspeaking telephone system
CA1017087A (en)	1977-09-06	Electronic telephone subscriber set
CA1033484A (en)	1978-06-20	Key telephone system for subscribers
CA1004787A (en)	1977-02-01	Telephone ringer isolator-ringing extender
AU500043B2 (en)	1979-05-10	Telephone ringer arrangement
CA1019484A (en)	1977-10-18	Telephone calling signal translating circuitry
CA1029140A (en)	1978-04-04	Transient controlled telephone line circuit
CA1010166A (en)	1977-05-10	Key telephone system
AU497191B2 (en)	1978-12-07	Spc telecommunication system
CA1026025A (en)	1978-02-07	Telephone intercommunication system incorporating improved dialing arrangement
CA1027272A (en)	1978-02-28	Modem-exchange interface for telecommunications systems
AU494622B2 (en)	1974-05-19	Telephone line control system
AU8647875A (en)	1977-05-19	Telephone line control system
AU494905B2 (en)	1977-03-31	Akey TELEPHONE SYSTEM FOR SUBSCRIBERS
AU490055B2 (en)	1976-10-21	Telephone system comprising a satellite
CA1031445A (en)	1978-05-16	Vehicle-emergency call system
CA1004786A (en)	1977-02-01	Push-button calling circuits for telephone sets
AU494363B2 (en)	1976-11-11	Telecommunication system
AU494820B2 (en)	1977-07-07	Telephone connector
CA987806A (en)	1976-04-20	Attachment for telephones
AU8015275A (en)	1976-10-21	Telephone system comprising a satellite
AU8015375A (en)	1976-10-21	Telephone system comprising a satellite