BE475910A - - Google Patents

Info

Publication number
BE475910A
BE475910A BE475910DA BE475910A BE 475910 A BE475910 A BE 475910A BE 475910D A BE475910D A BE 475910DA BE 475910 A BE475910 A BE 475910A
Authority
BE
Belgium
Prior art keywords
current
rectifier
installation
relay
microphone
Prior art date
Application number
Other languages
English (en)
French (fr)
Publication of BE475910A publication Critical patent/BE475910A/fr

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
    • G08B13/1609—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems
    • G08B13/1618—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means
    • G08B13/1627—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means using Doppler shift detection circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
BE475910D BE475910A (2)

Publications (1)

Publication Number Publication Date
BE475910A true BE475910A (2)

Family

ID=124453

Family Applications (1)

Application Number Title Priority Date Filing Date
BE475910D BE475910A (2)

Country Status (1)

Country Link
BE (1) BE475910A (2)

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