GB1444828A - - Google Patents

Info

Publication number: GB1444828A
Authority: GB; United Kingdom
Prior art keywords: signal; transmit; receive; channel; comparator
Prior art date: 1973-03-12
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

GB1100174A

Other languages

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.)

1973-03-12

Filing date

1974-03-12

Publication date

1976-08-04

1974-03-12 Application filed by Northern Electric Co Ltd filed Critical Northern Electric Co Ltd

1976-08-04 Publication of GB1444828A publication Critical patent/GB1444828A/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
- 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

Landscapes

Engineering & Computer Science (AREA)
Signal Processing (AREA)
Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Amplifiers (AREA)
Circuit For Audible Band Transducer (AREA)
Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

GB1100174A 1973-03-12 1974-03-12 Expired GB1444828A (it)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
CA165,801A CA976677A (en)	1973-03-12	1973-03-12	Loudspeaking communication terminal apparatus and method of operation

Publications (1)

Publication Number	Publication Date
GB1444828A true GB1444828A (it)	1976-08-04

Family

ID=4096059

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
GB1100174A Expired GB1444828A (it)	1973-03-12	1974-03-12

Country Status (11)

Country	Link
AU (1)	AU476504B2 (it)
BE (1)	BE812212A (it)
BR (1)	BR7401879D0 (it)
CA (1)	CA976677A (it)
FR (1)	FR2221885B1 (it)
GB (1)	GB1444828A (it)
IE (1)	IE40708B1 (it)
IT (1)	IT1025013B (it)
NL (1)	NL169809C (it)
SE (1)	SE400148B (it)
ZA (1)	ZA741555B (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4178548A (en) *	1976-10-04	1979-12-11	Geraldine E. Thompson	Voice actuated mobile radio
GB2174578A (en) *	1985-05-04	1986-11-05	Stc Plc	Loudspeaking telephone
WO1987000995A1 (en) *	1985-08-06	1987-02-12	Outel Oy	An intermediate amplifier for use in two-wire connections of a dial telephone network and a method for the gain control of said amplifier

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE2842369A1 (de) *	1978-09-28	1980-04-10	Siemens Ag	Schaltungsanordnung fuer eine sprachgesteuerte lautfernsprechstation in fernmelde-, insbesondere fernsprechanlagen
CA1291837C (en) *	1987-07-15	1991-11-05	Juro Ohga	Electronic telephone terminal having noise suppression function

1973
- 1973-03-12 CA CA165,801A patent/CA976677A/en not_active Expired
1974
- 1974-03-08 SE SE7403134A patent/SE400148B/xx not_active IP Right Cessation
- 1974-03-12 GB GB1100174A patent/GB1444828A/en not_active Expired
- 1974-03-12 AU AU66579/74A patent/AU476504B2/en not_active Expired
- 1974-03-12 NL NLAANVRAGE7403286,A patent/NL169809C/xx not_active IP Right Cessation
- 1974-03-12 IE IE528/74A patent/IE40708B1/xx unknown
- 1974-03-12 FR FR7408283A patent/FR2221885B1/fr not_active Expired
- 1974-03-12 BE BE141936A patent/BE812212A/xx unknown
- 1974-03-12 BR BR741879A patent/BR7401879D0/pt unknown
- 1974-04-08 IT IT20494/74A patent/IT1025013B/it active
- 1974-04-09 ZA ZA00741555*[A patent/ZA741555B/xx unknown

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4178548A (en) *	1976-10-04	1979-12-11	Geraldine E. Thompson	Voice actuated mobile radio
GB2174578A (en) *	1985-05-04	1986-11-05	Stc Plc	Loudspeaking telephone
WO1987000995A1 (en) *	1985-08-06	1987-02-12	Outel Oy	An intermediate amplifier for use in two-wire connections of a dial telephone network and a method for the gain control of said amplifier
GB2199217A (en) *	1985-08-06	1988-06-29	Outel Oy	An intermediate amplifier for use in two-wire connections of a dial telephone network and a method for the gain control of said amplifier
US4831651A (en) *	1985-08-06	1989-05-16	Outel Oy	Intermediate amplifier for use in two-wire connections of a dial telephone network and method for the gain control of said amplifier
GB2199217B (en) *	1985-08-06	1989-07-26	Outel Oy	An intermediate amplifier for use in two-wire connections of a dial telephone network and a method for the gain control of said amplifier

Also Published As

Publication number	Publication date
IE40708B1 (en)	1979-08-01
DE2411501A1 (de)	1974-10-10
IT1025013B (it)	1978-08-10
ZA741555B (en)	1975-02-26
BE812212A (fr)	1974-07-31
AU6657974A (en)	1975-09-18
AU476504B2 (en)	1976-09-23
BR7401879D0 (pt)	1974-11-19
FR2221885B1 (it)	1982-04-23
NL7403286A (it)	1974-09-16
NL169809C (nl)	1982-08-16
NL169809B (nl)	1982-03-16
CA976677A (en)	1975-10-21
FR2221885A1 (it)	1974-10-11
SE400148B (sv)	1978-03-13
DE2411501B2 (de)	1975-08-21

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Legal Events

Date	Code	Title
1976-12-15	PS	Patent sealed
1984-03-14	732	Registration of transactions, instruments or events in the register (sect. 32/1977)
1989-11-08	PCNP	Patent ceased through non-payment of renewal fee