IT986585B - Sistema di sicurezza di area com prendente almeno un microfono ac coppiato acusticamente con un tu bo interrato - Google Patents
Sistema di sicurezza di area com prendente almeno un microfono ac coppiato acusticamente con un tu bo interratoInfo
- 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
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)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7208873A NL7208873A (xx) | 1972-06-28 | 1972-06-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
IT986585B true IT986585B (it) | 1975-01-30 |
Family
ID=19816393
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT6889273A IT986585B (it) | 1972-06-28 | 1973-06-25 | Sistema di sicurezza di area com prendente almeno un microfono ac coppiato acusticamente con un tu bo interrato |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS4986036A (xx) |
DE (1) | DE2329593A1 (xx) |
FR (1) | FR2191180B1 (xx) |
IT (1) | IT986585B (xx) |
NL (1) | NL7208873A (xx) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2560701B1 (fr) * | 1984-03-05 | 1987-04-17 | Sogesec Sarl | Detecteur d'acces a pression differentielle |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1267874A (fr) * | 1960-06-14 | 1961-07-28 | Wattson Sa | Procédé et dispositif détecteur de franchissement localisant |
IL29843A (en) * | 1967-08-24 | 1971-07-28 | Westinghouse Electric Corp | Intruder detecting apparatus |
-
1972
- 1972-06-28 NL NL7208873A patent/NL7208873A/xx unknown
-
1973
- 1973-06-09 DE DE19732329593 patent/DE2329593A1/de active Pending
- 1973-06-25 IT IT6889273A patent/IT986585B/it active
- 1973-06-25 JP JP48070903A patent/JPS4986036A/ja active Pending
- 1973-06-26 FR FR7323346A patent/FR2191180B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS4986036A (xx) | 1974-08-17 |
FR2191180B1 (xx) | 1976-09-17 |
NL7208873A (xx) | 1974-01-02 |
DE2329593A1 (de) | 1974-01-10 |
FR2191180A1 (xx) | 1974-02-01 |
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IT986585B (it) | Sistema di sicurezza di area com prendente almeno un microfono ac coppiato acusticamente con un tu bo interrato |