GB1412806A - Electronic door announcer - Google Patents

Electronic door announcer

Info

Publication number
GB1412806A
GB1412806A GB3295373A GB3295373A GB1412806A GB 1412806 A GB1412806 A GB 1412806A GB 3295373 A GB3295373 A GB 3295373A GB 3295373 A GB3295373 A GB 3295373A GB 1412806 A GB1412806 A GB 1412806A
Authority
GB
United Kingdom
Prior art keywords
door
announcer
flats
television
ctv
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
GB3295373A
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.)
DESANTI E
Original Assignee
DESANTI E
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 DESANTI E filed Critical DESANTI E
Publication of GB1412806A publication Critical patent/GB1412806A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/106—Adaptations for transmission by electrical cable for domestic distribution
    • 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
    • H04N7/10—Adaptations for transmission by electrical cable
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
GB3295373A 1972-09-08 1973-07-11 Electronic door announcer Expired GB1412806A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7231853A FR2199149B1 (enrdf_load_stackoverflow) 1972-09-08 1972-09-08

Publications (1)

Publication Number Publication Date
GB1412806A true GB1412806A (en) 1975-11-05

Family

ID=9104010

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3295373A Expired GB1412806A (en) 1972-09-08 1973-07-11 Electronic door announcer

Country Status (4)

Country Link
DE (1) DE2341304A1 (enrdf_load_stackoverflow)
FR (1) FR2199149B1 (enrdf_load_stackoverflow)
GB (1) GB1412806A (enrdf_load_stackoverflow)
IT (1) IT996665B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2263844A (en) * 1992-01-30 1993-08-04 Millicom Satellite Tv Services Communication systems

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2593339A1 (fr) * 1986-01-23 1987-07-24 Darbonne Herve Installation pour la commande a distance par ondes hertziennes d'une porte d'immeuble
FR2610434A1 (fr) * 1987-01-29 1988-08-05 Mirica Gheorghe Portail electronique dissimulateur
FR2612671A1 (fr) * 1987-03-18 1988-09-23 Lorenzelli Marcel Systeme video portier phonique utilisant un seul cable coaxial pour la transmission des informations, et un recepteur de television standard sans modification, et une telecommande sans fil
DE19529039C2 (de) * 1995-08-08 1999-06-10 Juergen Blask Haustür-Sicherheits- und Öffnungssystem im Türschild

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3423521A (en) * 1966-01-24 1969-01-21 Gordon A Friesen Associates In Television system having common transmission line for power,video signals,and command signals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2263844A (en) * 1992-01-30 1993-08-04 Millicom Satellite Tv Services Communication systems

Also Published As

Publication number Publication date
FR2199149A1 (enrdf_load_stackoverflow) 1974-04-05
DE2341304A1 (de) 1974-03-21
IT996665B (it) 1975-12-10
FR2199149B1 (enrdf_load_stackoverflow) 1976-05-21

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee