FR2221885A1 - - Google Patents

Info

Publication number
FR2221885A1
FR2221885A1 FR7408283A FR7408283A FR2221885A1 FR 2221885 A1 FR2221885 A1 FR 2221885A1 FR 7408283 A FR7408283 A FR 7408283A FR 7408283 A FR7408283 A FR 7408283A FR 2221885 A1 FR2221885 A1 FR 2221885A1
Authority
FR
France
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.)
Granted
Application number
FR7408283A
Other languages
French (fr)
Other versions
FR2221885B1 (pt
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.)
Filing date
Publication date
Application filed by Northern Electric Co Ltd filed Critical Northern Electric Co Ltd
Publication of FR2221885A1 publication Critical patent/FR2221885A1/fr
Application granted granted Critical
Publication of FR2221885B1 publication Critical patent/FR2221885B1/fr
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
    • H04M9/10—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)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Amplifiers (AREA)
FR7408283A 1973-03-12 1974-03-12 Expired FR2221885B1 (pt)

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 (2)

Publication Number Publication Date
FR2221885A1 true FR2221885A1 (pt) 1974-10-11
FR2221885B1 FR2221885B1 (pt) 1982-04-23

Family

ID=4096059

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7408283A Expired FR2221885B1 (pt) 1973-03-12 1974-03-12

Country Status (11)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009591A1 (de) * 1978-09-28 1980-04-16 Siemens Aktiengesellschaft Schaltungsanordnung für eine sprachgesteuerte Lautfernsprechstation in Fernmelde-, insbesondere Fernsprechanlagen
EP0299507A2 (en) * 1987-07-15 1989-01-18 Fujitsu Limited Electronic telephone terminal having noise suppression function

Families Citing this family (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
GB2174578B (en) * 1985-05-04 1988-11-09 Stc Plc Loud speaking telephone
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.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009591A1 (de) * 1978-09-28 1980-04-16 Siemens Aktiengesellschaft Schaltungsanordnung für eine sprachgesteuerte Lautfernsprechstation in Fernmelde-, insbesondere Fernsprechanlagen
EP0299507A2 (en) * 1987-07-15 1989-01-18 Fujitsu Limited Electronic telephone terminal having noise suppression function
EP0299507A3 (en) * 1987-07-15 1989-06-07 Fujitsu Limited Electronic telephone terminal having noise suppression function
US4908855A (en) * 1987-07-15 1990-03-13 Fujitsu Limited Electronic telephone terminal having noise suppression function

Also Published As

Publication number Publication date
CA976677A (en) 1975-10-21
NL169809B (nl) 1982-03-16
BR7401879D0 (pt) 1974-11-19
GB1444828A (pt) 1976-08-04
NL7403286A (pt) 1974-09-16
DE2411501A1 (de) 1974-10-10
DE2411501B2 (de) 1975-08-21
NL169809C (nl) 1982-08-16
ZA741555B (en) 1975-02-26
SE400148B (sv) 1978-03-13
AU476504B2 (en) 1976-09-23
BE812212A (fr) 1974-07-31
IE40708B1 (en) 1979-08-01
FR2221885B1 (pt) 1982-04-23
AU6657974A (en) 1975-09-18
IT1025013B (it) 1978-08-10

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Legal Events

Date Code Title Description
CD Change of name or company name
ST Notification of lapse