EP0726548B1 - Détecteur sonique pour la surveillance d'intrusions - Google Patents

Détecteur sonique pour la surveillance d'intrusions Download PDF

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Publication number
EP0726548B1
EP0726548B1 EP95101937A EP95101937A EP0726548B1 EP 0726548 B1 EP0726548 B1 EP 0726548B1 EP 95101937 A EP95101937 A EP 95101937A EP 95101937 A EP95101937 A EP 95101937A EP 0726548 B1 EP0726548 B1 EP 0726548B1
Authority
EP
European Patent Office
Prior art keywords
borne sound
comb
filter
sound detector
detector according
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.)
Expired - Lifetime
Application number
EP95101937A
Other languages
German (de)
English (en)
Other versions
EP0726548A1 (fr
Inventor
Cornel Studach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Building Technologies AG
Original Assignee
Siemens Building Technologies AG
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 Siemens Building Technologies AG filed Critical Siemens Building Technologies AG
Priority to EP95101937A priority Critical patent/EP0726548B1/fr
Priority to DE59510930T priority patent/DE59510930D1/de
Priority to ES95101937T priority patent/ES2224111T3/es
Priority to CA002167624A priority patent/CA2167624C/fr
Priority to AU42192/96A priority patent/AU693972B2/en
Priority to US08/600,365 priority patent/US5705985A/en
Publication of EP0726548A1 publication Critical patent/EP0726548A1/fr
Application granted granted Critical
Publication of EP0726548B1 publication Critical patent/EP0726548B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G08B13/1672—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using sonic detecting means, e.g. a microphone operating in the audio frequency range
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S367/00—Communications, electrical: acoustic wave systems and devices
    • Y10S367/901—Noise or unwanted signal reduction in nonseismic receiving system

Definitions

  • the invention relates to a structure-borne sound detector for monitoring cash cabinets, Armored safes, vault rooms and cash dispensers, with one with the object to be monitored connected to the sensor for recording structure-borne noise, and with a transmitter connected to the sensor, in which a mixture the amplified sensor signal with a carrier frequency and a filtering of the mixed Signals in a narrow frequency range takes place.
  • detectors also known as noise detectors, are used to detect attacks on protective objects made of steel or concrete and on safes with plastic reinforced Protective coatings.
  • the function of structure-borne sound or noise detectors Based on the fact that when machining hard materials, such as Concrete or metal, mass accelerations arise and thereby mechanical Vibrations are generated, which propagate in the material as structure-borne noise.
  • piezoelectric sensor absorbs these vibrations and converts them into electrical signals.
  • the detector electronics analyzes the signals and triggers them with the appropriate signal Result in an alarm.
  • the transmitter of this known structure-borne sound detector has the advantage that the evaluated frequency band is much sharper limited than in mere use of a bandpass filter, of course, one within the evaluated Frequency band lying interferers still trigger a false alarm.
  • the structure-borne sound vibrations generated in a break-in attempt in a characteristic Frequency domain preferably in the kHz range near the upper audible limit between about 12 and 20 kHz, while typical noise much lower frequency or higher frequency.
  • characteristic frequency range again and again long-lasting oscillations occur, making it to the Triggering false alarms comes.
  • the invention is now an evaluation for a structure-borne sound detector be given, with the lying within the frequency range mentioned Interference signals are suppressed and thus the reliability and false alarm safety appropriately equipped body sound detector is decisively improved.
  • the transmitter a comb filter circuit which consists of two parallel, mirrored constructed comb filters whose outputs to a minimum level are guided, of which only the respective smaller of the output signals of the two Comb filter is fed to the further processing.
  • each comb filter has a filter period of not more than 500 Hz.
  • the filter period is 200 Hz.
  • a normal attack or break-in signal is relatively broadband and is sent to the Outputs of both comb filters of the comb filter circuit an approximately equal signal so that it does not matter which of the two signals is processed.
  • the smaller signal will only be insignificantly smaller than the larger one and therefore will as quick and as sure as this alarm will trigger. If, however, in the considered Frequency band a relatively narrow-band interference occurs, then this, because of the low filter period, certainly from the one comb filter let through and from the other not, so the occurrence of a particular Difference between the output signals of the two comb filters an indication is a disturber. If now, as proposed according to the invention, only the respective smaller of the two signals is processed, then the spurious radiation automatically suppressed and need not be further analyzed.
  • the structure-borne sound detector M shown in FIG. 1 contains a structure-borne sound pickup acting microphone 1 and a transmitter E.
  • the microphone is used for Exception of the vibrations caused by machining of hard materials arising mass acceleration and to convert this Vibrations in electrical signals.
  • the transmitter E is for example off US-A-4,290,058 and the structure-borne sound detectors of the types GM31, GM35 and GM36 of Cerberus AG forth, and will be described here only briefly.
  • In terms of of the microphone 1 is to the C patent application no. 0 172/94 Cerberus AG directed.
  • the output signal of the microphone 1 is an impedance converter 2 a preamplifier 3 supplied.
  • the pre-amplified signal passes through another amplifier 4 to a mixer 5 where the amplified signal is mixed with the signal of an oscillator 7 becomes.
  • the signal mixing product is a sensitivity regulator 8 a Intermediate frequency amplifier 9 supplied, which also contains a low-pass filter.
  • the reinforced IF signal enters an A / D converter 10 and from this into a comb filter circuit 11, whose output signal is fed to an integrator 12, in which a numerical integration of the output signal of the comb filter circuit 11 takes place. As soon as the value at the integrator 12 exceeds the threshold of an alarm comparator 13, is triggered by the fall of an alarm relay 14 alarm
  • the alarm comparator is connected as a Schmitt trigger.
  • the switching thresholds selected so that when alarm by the integrator 12, the alarm self-hold time over a timer 15 is set to about 1 s.
  • a flip-flop 16 is triggered, which charges the integrator 12 in a very short time and causes an alarm. If the time interval between two consecutive Noise is greater than about 5 to 10 seconds, then the integrator 12 is through unload a level 17 quickly.
  • the functions of comb filter circuit 11, integrator 12, alarm comparator 13 and stage 17 are calculated in a microprocessor ⁇ P. .Fig. FIG. 2 shows a somewhat more detailed illustration of the comb filter circuit 11 of FIG. 1.
  • this consists of two parallel, mirror images constructed, comb filters 18 and 18 ', the outputs of which led to a minimum level 19 are, of which only the smaller of the output signals of the comb filter 18, 18 'are forwarded to the integrator 12 (FIG. 1) and the larger signal is suppressed becomes.
  • a comb filter is known to be a filter with a periodic frequency response, alternate at the passage and blocking areas.
  • comb filters are used in video signal processing in the color decoder of television receivers (see for example: H. Schönfelder "Bildkommunikation", p. 188f, Springer Verlag, Berlin, Heidelberg, New York, 1983).
  • the mirror image structure the two comb filter 18, 18 'means that where, where the one filter, the stop bands where the other are the passbands and vice versa. And the has the consequence that one within a frequency band with one half a filter period corresponding bandwidth occurring narrowband signal from one of both comb filters 18 or 18 'let through and not let through the other or at least strongly suppressed.
  • Fig. 3 shows the transfer characteristic of one of the two comb filters 18, 18 'via a frequency range of 800 Hz.
  • This frequency range is in the transmitter E down to a band between 0 and 4 kHz down, over which band also extends the transmission range of the two comb filters 18, 18 '.
  • the comb filters are each for a frequency band of 100 Hz width permeable and impermeable for a same wide frequency band.
  • the filter period P is 200 Hz and each of the two comb filters 18, 18 'has 20 each Blocking and passage areas, which in the two filters by half a filter period are shifted against each other.
  • the normal attack signal or break-in signal shown in FIG. 4 is thus broadband, the output signals of the two comb filters 18, 18 '(FIG. 2) are always approximately equal be big, making it for the decision, whether a burglary or attempted attack is present and alarm is to be triggered does not matter which the two output signals is further processed.
  • the interference signal of Fig. 5 the conditions are different:
  • two Components that make up the displayed signal On the one hand relatively small and quiet basic signal in which all frequencies from the considered Are represented approximately equal area, and on the other hand, a striking, very narrow interference signal at about 16 kHz.
  • This jamming signal is so narrow that it is highly probable only by the one of the two comb filter 18 or 18 'and from the other is locked. Since the filter blocking the noise, the smaller output signal supplies, so the interference signal is not taken into account during further processing.
  • the comb filters are dimensioned so that in the vast majority of cases the Noise signal from one of the two filters 18 or 18 'is suppressed. So that also interference signals, exactly in the transition area A (Fig. 2) between the passage and the Restricted area of the comb filter lie, are suppressed with certainty, are the two Comb filter 18, 18 'so designed that the stopband is always slightly wider than that Passband, so that in this transition area A lock both filters and thus a possible interference signal from both filters 18 and 18 'is suppressed.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Claims (8)

  1. Détecteur de bruit de corps pour la surveillance de coffres-forts, de coffres blindés, de chambres de coffres et de distributeurs automatiques de billets, comprenant un capteur d'enregistrement du bruit de corps qui est relié à l'objet à surveiller et une électronique qui est raccordée au capteur et dans laquelle s'effectue un mélange du signal amplifié du capteur à une fréquence porteuse et un filtrage des signaux mélangés dans un domaine de fréquence étroit, caractérisé en ce que l'électronique (E) d'exploitation comporte un circuit (11) de filtres en peigne, qui est constitué de deux filtres (18, 18') en peigne montés en parallèle et disposés symétriquement comme en un miroir, dont des sorties vont à un étage (19) de minimum, duquel seul le plus petit, respectivement, des signaux de sortie des deux filtres en peigne est envoyé à un traitement ultérieur.
  2. Détecteur de bruit de corps suivant la revendication 1, caractérisé en ce que chaque filtre (18, 18') en peigne a une période (P) de filtre, qui n'est pas supérieure à 500 Hz.
  3. Détecteur de bruit de corps suivant la revendication 2, caractérisé en ce que la période (P) de filtre est de 200 Hz.
  4. Détecteur de bruit de corps suivant la revendication 3, caractérisé en ce que les bandes d'arrêt et les bandes de transmission des deux filtres (18, 18') en peigne sont décalées les unes par rapport aux autres d'une demi-période (P).
  5. Détecteur de bruit de corps suivant l'une des revendications 1 à 4, caractérisé en ce que les bandes de transmission des deux filtres (18, 18') en peigne sont un peu plus étroites que les bandes d'arrêt, de sorte que dans les zones de transition entre la bande de transmission et la bande d'arrêt, les deux filtres bloquent simultanément.
  6. Détecteur de bruit de corps suivant l'une des revendications 1 à 5, caractérisé en ce que l'électronique (E) d'exploitation comporte un microprocesseur (µP) et en ce que les filtres (18, 18') en peigne sont calculés dans ce microprocesseur.
  7. Détecteur de bruit de corps suivant la revendication 6, caractérisé en ce que le circuit (11) de filtres en peigne est calculé dans le microprocesseur (µP) sous la forme d'un filtre FIR.
  8. Détecteur de bruit de corps suivant la revendication 6, caractérisé en ce que le circuit (11) de filtres en peigne est calculé dans le microprocesseur (µP) sous la forme d'un filtre IIR.
EP95101937A 1995-02-13 1995-02-13 Détecteur sonique pour la surveillance d'intrusions Expired - Lifetime EP0726548B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP95101937A EP0726548B1 (fr) 1995-02-13 1995-02-13 Détecteur sonique pour la surveillance d'intrusions
DE59510930T DE59510930D1 (de) 1995-02-13 1995-02-13 Körperschallmelder zur Einbruchüberwachung
ES95101937T ES2224111T3 (es) 1995-02-13 1995-02-13 Detector de sonido corporal para la supervision de intrusiones.
CA002167624A CA2167624C (fr) 1995-02-13 1996-01-19 Capteur de sons transmis par les structures pour detecteur de tentatives d'effraction
AU42192/96A AU693972B2 (en) 1995-02-13 1996-01-29 Structure-borne sound detector for break-in surveillance
US08/600,365 US5705985A (en) 1995-02-13 1996-02-13 Structure-borne sound detector for break-in surveillance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95101937A EP0726548B1 (fr) 1995-02-13 1995-02-13 Détecteur sonique pour la surveillance d'intrusions

Publications (2)

Publication Number Publication Date
EP0726548A1 EP0726548A1 (fr) 1996-08-14
EP0726548B1 true EP0726548B1 (fr) 2004-07-21

Family

ID=8218972

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95101937A Expired - Lifetime EP0726548B1 (fr) 1995-02-13 1995-02-13 Détecteur sonique pour la surveillance d'intrusions

Country Status (6)

Country Link
US (1) US5705985A (fr)
EP (1) EP0726548B1 (fr)
AU (1) AU693972B2 (fr)
CA (1) CA2167624C (fr)
DE (1) DE59510930D1 (fr)
ES (1) ES2224111T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9812842D0 (en) * 1998-06-16 1998-08-12 Ncr Int Inc Automatic teller machines
FR2809215B1 (fr) * 2000-05-18 2004-09-10 F And F Internat Dispositif d'alarme autoregule a tres faible consommation d'energie
US6720875B2 (en) 2000-05-18 2004-04-13 F And F International S.A.R.L. Self-adjusting alarm device with low energy consumption
US9191762B1 (en) 2012-02-23 2015-11-17 Joseph M. Matesa Alarm detection device and method
US20160380814A1 (en) * 2015-06-23 2016-12-29 Roost, Inc. Systems and methods for provisioning a battery-powered device to access a wireless communications network

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH643078A5 (de) * 1978-11-30 1984-05-15 Cerberus Ag Verfahren und anordnung zur einbruchmeldung.
DE2900444A1 (de) * 1979-01-08 1980-07-10 Licentia Gmbh Verfahren und schaltungsanordnung zur auswertung von ausgangssignalen von schallaufnehmern einer objektschutzueberwachungsanlage und zur erzeugung eines alarmsignals
FR2560701B1 (fr) * 1984-03-05 1987-04-17 Sogesec Sarl Detecteur d'acces a pression differentielle
FR2569027B1 (fr) * 1984-03-28 1986-12-05 Vg Electronique Electro Guglie Procede de detection perimetrique a infrasons, traitement des infrasons

Also Published As

Publication number Publication date
CA2167624A1 (fr) 1996-08-14
DE59510930D1 (de) 2004-08-26
US5705985A (en) 1998-01-06
AU4219296A (en) 1996-08-22
AU693972B2 (en) 1998-07-09
ES2224111T3 (es) 2005-03-01
EP0726548A1 (fr) 1996-08-14
CA2167624C (fr) 2007-05-15

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