CA2157894A1 - Intrusion detection apparatus - Google Patents
Intrusion detection apparatusInfo
- Publication number
- CA2157894A1 CA2157894A1 CA002157894A CA2157894A CA2157894A1 CA 2157894 A1 CA2157894 A1 CA 2157894A1 CA 002157894 A CA002157894 A CA 002157894A CA 2157894 A CA2157894 A CA 2157894A CA 2157894 A1 CA2157894 A1 CA 2157894A1
- Authority
- CA
- Canada
- Prior art keywords
- signal
- logic circuit
- threshold
- affirmative
- amplitude
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
- G08B29/20—Calibration, including self-calibrating arrangements
- G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Burglar Alarm Systems (AREA)
Abstract
Intrusion detection apparatus for use in perimeter security systems and the like is provided with multiple channel signal processing.
Each signal processor includes a bandpass filter whose passband is selectable. Each is respectively responsive to sensed movement including vibrations within the associated selected passband. An output affirmative signal is generated if the amplitude of the input signal constituent within the associated frequency range exceeds a threshold level for a predetermined period of time. A logic circuit receives the outputs of all of the signal processors and provides an output alarm signal when a predetermined combination of affirmative signals is received from the signal processors. Such logic circuit preferably works with digital signals obtained by analog-to-digital conversion. A threshold bias adjustment may be provided for adjusting the threshold amplitude of at least one input signal so that ambient noise may be taken into consideration by the logic circuit.
Each signal processor includes a bandpass filter whose passband is selectable. Each is respectively responsive to sensed movement including vibrations within the associated selected passband. An output affirmative signal is generated if the amplitude of the input signal constituent within the associated frequency range exceeds a threshold level for a predetermined period of time. A logic circuit receives the outputs of all of the signal processors and provides an output alarm signal when a predetermined combination of affirmative signals is received from the signal processors. Such logic circuit preferably works with digital signals obtained by analog-to-digital conversion. A threshold bias adjustment may be provided for adjusting the threshold amplitude of at least one input signal so that ambient noise may be taken into consideration by the logic circuit.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CA1993/000092 WO1994020937A1 (en) | 1991-09-09 | 1993-03-10 | Intrusion detection apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2157894A1 true CA2157894A1 (en) | 1994-09-15 |
CA2157894C CA2157894C (en) | 2001-05-22 |
Family
ID=4172966
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002157894A Expired - Lifetime CA2157894C (en) | 1993-03-10 | 1993-03-10 | Intrusion detection apparatus |
Country Status (2)
Country | Link |
---|---|
CA (1) | CA2157894C (en) |
GB (1) | GB2290614B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1883910A1 (en) * | 2005-05-18 | 2008-02-06 | Idteq As | System and method for intrusion detection |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2756401B1 (en) * | 1996-11-28 | 1999-02-19 | Valeo Electronique | METHOD AND DEVICE FOR DETECTING INTRUSION IN A MOTOR VEHICLE |
RU2570230C1 (en) * | 2014-09-24 | 2015-12-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Пензенский государственный университет" (ФГБОУ ВПО ПГУ) | Device for detecting moving ground objects from seismic signal with standard false triggering probability |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2900444A1 (en) * | 1979-01-08 | 1980-07-10 | Licentia Gmbh | METHOD AND CIRCUIT ARRANGEMENT FOR EVALUATING OUTPUT SIGNALS FROM SOUND RECEIVERS OF AN OBJECT PROTECTION MONITORING SYSTEM AND FOR GENERATING AN ALARM SIGNAL |
US4307387A (en) * | 1979-02-23 | 1981-12-22 | Elliott Brothers (London) Limited | Vibration-responsive intruder alarm system |
FR2569027B1 (en) * | 1984-03-28 | 1986-12-05 | Vg Electronique Electro Guglie | PERIMETRIC INFRASON DETECTION METHOD, INFRASON TREATMENT |
US4853677A (en) * | 1988-07-20 | 1989-08-01 | Yarbrough Alfred E | Portable intrusion alarm |
GB9005751D0 (en) * | 1990-03-14 | 1990-05-09 | Geoquip Ltd | Intrusion detection system and signal processing circuitry therefor |
-
1993
- 1993-03-10 GB GB9518644A patent/GB2290614B/en not_active Expired - Fee Related
- 1993-03-10 CA CA002157894A patent/CA2157894C/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1883910A1 (en) * | 2005-05-18 | 2008-02-06 | Idteq As | System and method for intrusion detection |
EP1883910A4 (en) * | 2005-05-18 | 2010-05-12 | Idteq As | System and method for intrusion detection |
Also Published As
Publication number | Publication date |
---|---|
CA2157894C (en) | 2001-05-22 |
GB2290614A (en) | 1996-01-03 |
GB2290614B (en) | 1997-01-22 |
GB9518644D0 (en) | 1995-11-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request |