ES488310A1 - Perfeccionamientos en los videofonos - Google Patents

Perfeccionamientos en los videofonos

Info

Publication number
ES488310A1
ES488310A1 ES488310A ES488310A ES488310A1 ES 488310 A1 ES488310 A1 ES 488310A1 ES 488310 A ES488310 A ES 488310A ES 488310 A ES488310 A ES 488310A ES 488310 A1 ES488310 A1 ES 488310A1
Authority
ES
Spain
Prior art keywords
switches
flats
communications system
capacitor
discharged
Prior art date
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
ES488310A
Other languages
English (en)
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.)
B P T SpA
BPT SpA
Original Assignee
B P T SpA
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 B P T SpA, BPT SpA filed Critical B P T SpA
Publication of ES488310A1 publication Critical patent/ES488310A1/es
Expired legal-status Critical Current

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)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Meter Arrangements (AREA)

Abstract

Perfeccionamientos en los videofonos, y más concretamente en los sistema para la vigilancia de un acceso a una zona reservada del tipo que comprenden un aparato exterior instalado en correspondencia con el citado acceso y por lo menos un aparato interior colocado en un correspondiente ambiente interior de la citada zona reservada.
ES488310A 1979-02-07 1980-02-06 Perfeccionamientos en los videofonos Expired ES488310A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT67269/79A IT1117616B (it) 1979-02-07 1979-02-07 Perfezionamenti nei videocitofani

Publications (1)

Publication Number Publication Date
ES488310A1 true ES488310A1 (es) 1980-10-01

Family

ID=11301004

Family Applications (1)

Application Number Title Priority Date Filing Date
ES488310A Expired ES488310A1 (es) 1979-02-07 1980-02-06 Perfeccionamientos en los videofonos

Country Status (3)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1165528B (it) * 1980-12-15 1987-04-22 Urmet Spa Impianto citofonico con trasmissione di immagine impiegantte quattro conduttori comuni ed un conduttore di selezione per ciascun posto interno

Also Published As

Publication number Publication date
IT1117616B (it) 1986-02-17
DE3002888A1 (de) 1980-08-14
IT7967269A0 (it) 1979-02-07

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