IT1003170B - Circuito di prevenzione della diafo nia negli impianti interfonici e si mili - Google Patents

Circuito di prevenzione della diafo nia negli impianti interfonici e si mili

Info

Publication number
IT1003170B
IT1003170B IT30944/73A IT3094473A IT1003170B IT 1003170 B IT1003170 B IT 1003170B IT 30944/73 A IT30944/73 A IT 30944/73A IT 3094473 A IT3094473 A IT 3094473A IT 1003170 B IT1003170 B IT 1003170B
Authority
IT
Italy
Prior art keywords
diapho
mili
nia
prevention circuit
intercom systems
Prior art date
Application number
IT30944/73A
Other languages
English (en)
Inventor
Ichikawa Shigemasa
Original Assignee
Aiphone 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 Aiphone Co Ltd filed Critical Aiphone Co Ltd
Application granted granted Critical
Publication of IT1003170B publication Critical patent/IT1003170B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
IT30944/73A 1973-03-30 1973-11-05 Circuito di prevenzione della diafo nia negli impianti interfonici e si mili IT1003170B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48037315A JPS49123706A (it) 1973-03-30 1973-03-30

Publications (1)

Publication Number Publication Date
IT1003170B true IT1003170B (it) 1976-06-10

Family

ID=12494237

Family Applications (1)

Application Number Title Priority Date Filing Date
IT30944/73A IT1003170B (it) 1973-03-30 1973-11-05 Circuito di prevenzione della diafo nia negli impianti interfonici e si mili

Country Status (4)

Country Link
US (1) US3919490A (it)
JP (1) JPS49123706A (it)
DE (1) DE2361721A1 (it)
IT (1) IT1003170B (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4256232A (en) * 1978-12-05 1981-03-17 Celanese Corporation Powder composition and method of preparation

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3189690A (en) * 1960-04-27 1965-06-15 Modern Telephones Great Britai Two-way telephone systems with talk-listen switching
US3286031A (en) * 1963-03-04 1966-11-15 Alto Scient Co Inc Voice actuated device
US3567868A (en) * 1968-08-27 1971-03-02 Tokyo Shibaura Electric Co Interphone device having presence indicator means
US3610835A (en) * 1970-03-17 1971-10-05 Bell Telephone Labor Inc Loudspeaking telephone
JPS5148006B1 (it) * 1970-09-03 1976-12-18
US3691311A (en) * 1970-12-10 1972-09-12 Pacific Plantronics Inc Telephone user set
US3743950A (en) * 1972-03-03 1973-07-03 Itt Threshold detector for a voice frequency receiver
US3725585A (en) * 1972-03-21 1973-04-03 Itt Loudspeaking telephone station circuit

Also Published As

Publication number Publication date
DE2361721A1 (de) 1974-10-17
US3919490A (en) 1975-11-11
JPS49123706A (it) 1974-11-27

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