NL7217676A - - Google Patents

Info

Publication number
NL7217676A
NL7217676A NL7217676A NL7217676A NL7217676A NL 7217676 A NL7217676 A NL 7217676A NL 7217676 A NL7217676 A NL 7217676A NL 7217676 A NL7217676 A NL 7217676A NL 7217676 A NL7217676 A NL 7217676A
Authority
NL
Netherlands
Application number
NL7217676A
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
Priority claimed from DE19722236431 external-priority patent/DE2236431A1/en
Application filed filed Critical
Publication of NL7217676A publication Critical patent/NL7217676A/xx

Links

Classifications

    • 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B1/00—Systems for signalling characterised solely by the form of transmission of the signal
    • G08B1/08—Systems for signalling characterised solely by the form of transmission of the signal using electric transmission ; transformation of alarm signals to electrical signals from a different medium, e.g. transmission of an electric alarm signal upon detection of an audible alarm signal
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G08B3/1008—Personal calling arrangements or devices, i.e. paging systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/44—Arrangements for feeding power to a repeater along the transmission line
    • 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
    • H04M11/022—Paging systems
    • 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
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Theoretical Computer Science (AREA)
  • Electromagnetism (AREA)
  • Multimedia (AREA)
  • Alarm Systems (AREA)
NL7217676A 1971-12-31 1972-12-27 NL7217676A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2165904 1971-12-31
DE19722236431 DE2236431A1 (en) 1972-07-25 1972-07-25 SYSTEM FOR MULTIPLE USE OF SIGNAL LINES IN BUILDINGS

Publications (1)

Publication Number Publication Date
NL7217676A true NL7217676A (en) 1973-07-03

Family

ID=25762266

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7217676A NL7217676A (en) 1971-12-31 1972-12-27

Country Status (4)

Country Link
FR (1) FR2167183A5 (en)
GB (1) GB1422130A (en)
IT (1) IT976190B (en)
NL (1) NL7217676A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123193B (en) * 1982-06-19 1985-12-11 James Ernest Gleave Public address system
FR2612671A1 (en) * 1987-03-18 1988-09-23 Lorenzelli Marcel Door phone video system using a single coaxial cable for transmitting information, a standard, unmodified television receiver, and wireless remote control
KR940000250B1 (en) * 1989-12-28 1994-01-12 주식회사 금성사 Signal transmitting device of door phone
ES2245192B1 (en) * 2003-08-08 2007-02-16 Raul Gonzalez Martinez AUTOMATIC PORTER INSTALLATION WITH BIDIRECTIONAL ACCESS TO TELEPHONE LINE.

Also Published As

Publication number Publication date
IT976190B (en) 1974-08-20
GB1422130A (en) 1976-01-21
FR2167183A5 (en) 1973-08-17

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