IT986585B - COM AREA SECURITY SYSTEM TAKING AT LEAST ONE AC MICROPHONE PAIRED ACOUSTICALLY WITH AN UNDERGROUND TU BO - Google Patents

COM AREA SECURITY SYSTEM TAKING AT LEAST ONE AC MICROPHONE PAIRED ACOUSTICALLY WITH AN UNDERGROUND TU BO

Info

Publication number
IT986585B
IT986585B IT6889273A IT6889273A IT986585B IT 986585 B IT986585 B IT 986585B IT 6889273 A IT6889273 A IT 6889273A IT 6889273 A IT6889273 A IT 6889273A IT 986585 B IT986585 B IT 986585B
Authority
IT
Italy
Prior art keywords
acoustically
underground
security system
system taking
area security
Prior art date
Application number
IT6889273A
Other languages
Italian (it)
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Application granted granted Critical
Publication of IT986585B publication Critical patent/IT986585B/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR 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
    • G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
    • G08B13/1681—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using infrasonic detecting means, e.g. a microphone operating below the audible frequency range

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)
IT6889273A 1972-06-28 1973-06-25 COM AREA SECURITY SYSTEM TAKING AT LEAST ONE AC MICROPHONE PAIRED ACOUSTICALLY WITH AN UNDERGROUND TU BO IT986585B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7208873A NL7208873A (en) 1972-06-28 1972-06-28

Publications (1)

Publication Number Publication Date
IT986585B true IT986585B (en) 1975-01-30

Family

ID=19816393

Family Applications (1)

Application Number Title Priority Date Filing Date
IT6889273A IT986585B (en) 1972-06-28 1973-06-25 COM AREA SECURITY SYSTEM TAKING AT LEAST ONE AC MICROPHONE PAIRED ACOUSTICALLY WITH AN UNDERGROUND TU BO

Country Status (5)

Country Link
JP (1) JPS4986036A (en)
DE (1) DE2329593A1 (en)
FR (1) FR2191180B1 (en)
IT (1) IT986585B (en)
NL (1) NL7208873A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2560701B1 (en) * 1984-03-05 1987-04-17 Sogesec Sarl DIFFERENTIAL PRESSURE ACCESS DETECTOR

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1267874A (en) * 1960-06-14 1961-07-28 Wattson Sa Method and device for detecting crossing locating
IL29843A (en) * 1967-08-24 1971-07-28 Westinghouse Electric Corp Intruder detecting apparatus

Also Published As

Publication number Publication date
NL7208873A (en) 1974-01-02
DE2329593A1 (en) 1974-01-10
FR2191180B1 (en) 1976-09-17
JPS4986036A (en) 1974-08-17
FR2191180A1 (en) 1974-02-01

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