ES457209A1 - Instalacion interfonica. - Google Patents

Instalacion interfonica.

Info

Publication number
ES457209A1
ES457209A1 ES457209A ES457209A ES457209A1 ES 457209 A1 ES457209 A1 ES 457209A1 ES 457209 A ES457209 A ES 457209A ES 457209 A ES457209 A ES 457209A ES 457209 A1 ES457209 A1 ES 457209A1
Authority
ES
Spain
Prior art keywords
cit
interphonic
translation
installation
machine
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
ES457209A
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.)
FREIBOGEN ANSTALT
Original Assignee
FREIBOGEN ANSTALT
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 FREIBOGEN ANSTALT filed Critical FREIBOGEN ANSTALT
Publication of ES457209A1 publication Critical patent/ES457209A1/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

Instalación interfónica, utilizable en particular como citófono, en la cual una pluralidad de aparatos derivados están conectados con el aparato principal por medio de sólo dos hilos en común, caracterizada porque la selección del aparato derivado llamado se realiza por superposición de las semiondas de una frecuencia de llamada y de mando con al menos una frecuencia asignada y porque a cada aparato derivado le corresponde al menos una frecuencia asignada.
ES457209A 1977-01-27 1977-03-25 Instalacion interfonica. Expired ES457209A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH104077A CH614578A5 (en) 1977-01-27 1977-01-27 Intercom system, in particular for use as a door intercom system

Publications (1)

Publication Number Publication Date
ES457209A1 true ES457209A1 (es) 1978-02-01

Family

ID=4201051

Family Applications (1)

Application Number Title Priority Date Filing Date
ES457209A Expired ES457209A1 (es) 1977-01-27 1977-03-25 Instalacion interfonica.

Country Status (5)

Country Link
CH (1) CH614578A5 (es)
DE (1) DE2729469C2 (es)
ES (1) ES457209A1 (es)
FR (1) FR2379205A1 (es)
IT (1) IT1077978B (es)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665116A (en) * 1969-12-19 1972-05-23 Fasco Industries Apartment house intercom system
ES396844A1 (es) * 1970-11-10 1974-06-16 Citovox Instalacion interfonica con cerradura electrica y conexio- nes obtenidas por solamente dos cables.
DE2409393B2 (de) * 1974-02-27 1976-07-29 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung fuer eine kleine bis mittlere torfernsprechanlage ohne zentrale steuereinrichtungen mit mehreren von einer torstation erreichbaren hausstationen
US3978468A (en) * 1974-11-11 1976-08-31 Robert F. Moore Intercom call signaling mechanism

Also Published As

Publication number Publication date
DE2729469A1 (de) 1978-08-03
DE2729469C2 (de) 1986-04-24
CH614578A5 (en) 1979-11-30
IT1077978B (it) 1985-05-08
FR2379205A1 (fr) 1978-08-25
FR2379205B1 (es) 1984-05-04

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