IT7967269A0 - IMPROVEMENTS IN VIDEO INTERPHONES - Google Patents

IMPROVEMENTS IN VIDEO INTERPHONES

Info

Publication number
IT7967269A0
IT7967269A0 IT7967269A IT6726979A IT7967269A0 IT 7967269 A0 IT7967269 A0 IT 7967269A0 IT 7967269 A IT7967269 A IT 7967269A IT 6726979 A IT6726979 A IT 6726979A IT 7967269 A0 IT7967269 A0 IT 7967269A0
Authority
IT
Italy
Prior art keywords
video interphones
interphones
video
Prior art date
Application number
IT7967269A
Other languages
Italian (it)
Other versions
IT1117616B (en
Original Assignee
Bpt Spa
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 Bpt Spa filed Critical Bpt Spa
Priority to IT67269/79A priority Critical patent/IT1117616B/en
Publication of IT7967269A0 publication Critical patent/IT7967269A0/en
Priority to DE19803002888 priority patent/DE3002888A1/en
Priority to ES488310A priority patent/ES488310A1/en
Application granted granted Critical
Publication of IT1117616B publication Critical patent/IT1117616B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
    • H04M11/025—Door telephones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/183—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source
    • H04N7/186—Video door telephones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
    • H04Q5/02—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange with direct connection for all subscribers, i.e. party-line systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Meter Arrangements (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
IT67269/79A 1979-02-07 1979-02-07 REFINEMENTS IN VIDEO DOOR PHONES IT1117616B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
IT67269/79A IT1117616B (en) 1979-02-07 1979-02-07 REFINEMENTS IN VIDEO DOOR PHONES
DE19803002888 DE3002888A1 (en) 1979-02-07 1980-01-28 Video communications system for main entrance and flats - has simple semiconductor switches replacing electromechanical switches
ES488310A ES488310A1 (en) 1979-02-07 1980-02-06 Video communications system for main entrance and flats - has simple semiconductor switches replacing electromechanical switches

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT67269/79A IT1117616B (en) 1979-02-07 1979-02-07 REFINEMENTS IN VIDEO DOOR PHONES

Publications (2)

Publication Number Publication Date
IT7967269A0 true IT7967269A0 (en) 1979-02-07
IT1117616B IT1117616B (en) 1986-02-17

Family

ID=11301004

Family Applications (1)

Application Number Title Priority Date Filing Date
IT67269/79A IT1117616B (en) 1979-02-07 1979-02-07 REFINEMENTS IN VIDEO DOOR PHONES

Country Status (3)

Country Link
DE (1) DE3002888A1 (en)
ES (1) ES488310A1 (en)
IT (1) IT1117616B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1165528B (en) * 1980-12-15 1987-04-22 Urmet Spa DOOR PHONE SYSTEM WITH IMAGE TRANSMISSION USING FOUR COMMON CONDUCTORS AND A SELECTION CONDUCTOR FOR EACH INTERNAL STATION

Also Published As

Publication number Publication date
DE3002888A1 (en) 1980-08-14
IT1117616B (en) 1986-02-17
ES488310A1 (en) 1980-10-01

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