IT1138521B - Telefono ad altoparlante senza trasformatore alimentato dalla linea - Google Patents

Telefono ad altoparlante senza trasformatore alimentato dalla linea

Info

Publication number
IT1138521B
IT1138521B IT23673/81A IT2367381A IT1138521B IT 1138521 B IT1138521 B IT 1138521B IT 23673/81 A IT23673/81 A IT 23673/81A IT 2367381 A IT2367381 A IT 2367381A IT 1138521 B IT1138521 B IT 1138521B
Authority
IT
Italy
Prior art keywords
line
speaker telephone
powered transformer
transformer
powered
Prior art date
Application number
IT23673/81A
Other languages
English (en)
Other versions
IT8123673A0 (it
Inventor
Edwin Munson Verne
Original Assignee
Western Electric Co
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 Western Electric Co filed Critical Western Electric Co
Publication of IT8123673A0 publication Critical patent/IT8123673A0/it
Application granted granted Critical
Publication of IT1138521B publication Critical patent/IT1138521B/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)
  • Amplifiers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
IT23673/81A 1980-08-29 1981-08-28 Telefono ad altoparlante senza trasformatore alimentato dalla linea IT1138521B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/182,439 US4385207A (en) 1980-08-29 1980-08-29 Line powered transformerless loudspeaking telephone

Publications (2)

Publication Number Publication Date
IT8123673A0 IT8123673A0 (it) 1981-08-28
IT1138521B true IT1138521B (it) 1986-09-17

Family

ID=22668498

Family Applications (1)

Application Number Title Priority Date Filing Date
IT23673/81A IT1138521B (it) 1980-08-29 1981-08-28 Telefono ad altoparlante senza trasformatore alimentato dalla linea

Country Status (16)

Country Link
US (1) US4385207A (it)
JP (1) JPS5776936A (it)
AU (1) AU546508B2 (it)
BE (1) BE890109A (it)
CA (1) CA1167988A (it)
CH (1) CH654156A5 (it)
DE (1) DE3133424A1 (it)
ES (1) ES8302985A1 (it)
FR (1) FR2489632B1 (it)
GB (1) GB2083976B (it)
HK (1) HK6586A (it)
IE (1) IE52201B1 (it)
IL (2) IL63653A (it)
IT (1) IT1138521B (it)
NL (1) NL8104016A (it)
SE (1) SE447776B (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4492824A (en) * 1983-08-11 1985-01-08 At&T Bell Laboratories Speakerphone linear comparator
US4831650A (en) * 1988-05-16 1989-05-16 Palco Telecom, Inc. Adaptive telephone receive control
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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS495645B1 (it) * 1970-02-07 1974-02-08
US3725585A (en) * 1972-03-21 1973-04-03 Itt Loudspeaking telephone station circuit
IT1024530B (it) * 1974-03-21 1978-07-20 Sits Soc It Telecom Siemens Circuito telefonico amplificato senza trasformatore
CA1056970A (en) * 1977-01-10 1979-06-19 Northern Telecom Limited Electronic network for telephone set
DE2807304C2 (de) * 1978-02-21 1982-07-01 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltungsanordnung zum Verstärken eines in einer aus einer Teilnehmeranschlußleitung gespeisten Endstelle einer Fernmeldeanlage erzeugten Signals
US4303805A (en) * 1979-05-21 1981-12-01 United Networks, Inc. Subscriber station network

Also Published As

Publication number Publication date
FR2489632A1 (fr) 1982-03-05
IE52201B1 (en) 1987-08-05
DE3133424C2 (it) 1987-10-01
SE447776B (sv) 1986-12-08
BE890109A (fr) 1981-12-16
HK6586A (en) 1986-02-07
AU7471081A (en) 1982-03-04
SE8104971L (sv) 1982-03-01
IT8123673A0 (it) 1981-08-28
CH654156A5 (de) 1986-01-31
US4385207A (en) 1983-05-24
IL63653A0 (en) 1981-11-30
DE3133424A1 (de) 1982-06-16
GB2083976B (en) 1984-05-02
FR2489632B1 (fr) 1985-10-25
IL63653A (en) 1984-05-31
ES504949A0 (es) 1983-02-01
ES8302985A1 (es) 1983-02-01
IE811969L (en) 1982-02-28
AU546508B2 (en) 1985-09-05
JPS5776936A (en) 1982-05-14
GB2083976A (en) 1982-03-31
NL8104016A (nl) 1982-03-16
CA1167988A (en) 1984-05-22

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