EP0612047A1 - Procédé pour analyser des signaux électroacoustiques - Google Patents

Procédé pour analyser des signaux électroacoustiques Download PDF

Info

Publication number
EP0612047A1
EP0612047A1 EP93102693A EP93102693A EP0612047A1 EP 0612047 A1 EP0612047 A1 EP 0612047A1 EP 93102693 A EP93102693 A EP 93102693A EP 93102693 A EP93102693 A EP 93102693A EP 0612047 A1 EP0612047 A1 EP 0612047A1
Authority
EP
European Patent Office
Prior art keywords
value
level
pass filter
threshold value
low
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.)
Withdrawn
Application number
EP93102693A
Other languages
German (de)
English (en)
Inventor
Uwe. Dipl.-Ing. Beis
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.)
Geutebrueck GmbH
Original Assignee
Geutebrueck GmbH
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 Geutebrueck GmbH filed Critical Geutebrueck GmbH
Priority to EP93102693A priority Critical patent/EP0612047A1/fr
Publication of EP0612047A1 publication Critical patent/EP0612047A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • G08B29/26—Self-calibration, e.g. compensating for environmental drift or ageing of components by updating and storing reference thresholds
    • 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
    • G08B13/169—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using cable transducer means

Definitions

  • the invention relates to a method for evaluating the signals from electro-acoustic transducers by means of an electronic circuit, in particular for alarm systems with microphones attached to limiting devices (fences) for recording and evaluating signals which are caused by structure-borne noise caused by climbing over a fence.
  • microphone cables Individual structure-borne sound microphones or sound-converting cables, known as microphone cables, which are attached to fences are known. Your signal voltage is fed to an evaluator. Frequency ranges are filtered out in the evaluator, if necessary, so that only a certain remaining range is used for evaluation. The evaluation triggers an alarm if the sound intensity or the signal voltage exceeds a certain value, possibly for a certain minimum time.
  • the disadvantage of this method is that with some fence constructions the sound levels caused by strong wind or rain are already so high that they can no longer be distinguished from climbing over in the manner described.
  • the invention is based on the object of creating a method, the type mentioned at the outset and a device for carrying it out, in order to be able to ascertain with certainty that a fence has been climbed over with all fence constructions and regardless of the weather conditions.
  • the solution according to the invention is characterized by the features of the characterizing part of claim 1.
  • Two pieces of information are extracted from the incoming signal.
  • One corresponds to the level, the other to the change in level, i. H. of modulation.
  • Wind and rain have the property that they cause relatively slow level changes.
  • the modulation values remain below those which arise when climbing over a fence, since the individual touches lead to rather isolated sound events and thus to a relatively stronger modulation.
  • the invention takes advantage of these circumstances and leads to the desired, precise differentiation of the individual sound causes.
  • a suitable device for carrying out the method according to the invention is characterized by the use of a microphone connected to an amplifier, a high-pass, a low-pass and a rectifier, which is used to determine the level value of an acoustic signal or a sound emission, the output of the rectifier being both direct and also by a branch via a further low-pass filter, a high-pass filter for separating the DC voltage component of the low-pass filter and a further rectifier for forming the modulation with a comparison module for subtracting the level value from that of the modulation. Its output is connected to a low-pass filter for the formation of a mean difference measured value over a predetermined time, followed by a threshold value comparator for comparing the mean measured value with the threshold value of a threshold value transmitter and with a subsequent alarm transmitter.
  • the signal coming from the microphone 1 is pre-amplified in the adjustable amplifier 2 and according to the most interesting frequency ranges, e.g. B. with a high-pass filter 3 and a low-pass filter 4, filtered.
  • the high-pass filter essentially filters out the higher-frequency interference signals.
  • the low-pass filter can be advantageous in order to filter out low frequencies which remain in the fence longer than high frequencies, which leads to a lower degree of modulation.
  • the low-pass filter 4 is also advantageous for filtering out any low-frequency interference signals, such as hum, that may be present.
  • the level of the signal is determined in the following rectifier 5. This is the first of the two aforementioned information.
  • this filter In order to obtain the change in level, this must first be determined in a low pass 6.
  • the time constant of this filter is adapted to the expected sound events, for example that when climbing over a fence, so that the output value of this filter can just follow the sound level change when climbing over.
  • An empirical value for this time constant is 0.3 seconds.
  • the direct voltage component (DC) of the low-pass filter is separated from a high-pass filter 7. This signal is zero as long as the input signal is constant and positive when the input level rises, but negative when the input level falls.
  • the second of the above information is created, namely the modulation.
  • the value for the level is subtracted from the value of the modulation with the aid of a comparison module 10, it being advisable to make one of these two values adjustable, which can be done by an amplifier 9 for the modulation value in the present example.
  • the difference formation is followed by a low-pass filter 11, which forms the average measured value over a prolonged time, for example 10 seconds.
  • This value is then compared using a threshold value comparator 13 with the adjustable threshold value of a potentiometer as a threshold value transmitter 12.
  • the threshold value transmitter 13 is in the example with a Alarm transmitter 14 connected so that an alarm can be triggered when the threshold value is exceeded.
  • the measured average level drives the measured value into the negative and the measured modulation drives the measured value into the positive.
  • the measured value can only become positive if the depth of modulation (i.e. the ratio of modulation / level) has a certain minimum value, and only if the modulation itself is large enough can the measured value also exceed the positive threshold.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Emergency Alarm Devices (AREA)
EP93102693A 1993-02-19 1993-02-19 Procédé pour analyser des signaux électroacoustiques Withdrawn EP0612047A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93102693A EP0612047A1 (fr) 1993-02-19 1993-02-19 Procédé pour analyser des signaux électroacoustiques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP93102693A EP0612047A1 (fr) 1993-02-19 1993-02-19 Procédé pour analyser des signaux électroacoustiques

Publications (1)

Publication Number Publication Date
EP0612047A1 true EP0612047A1 (fr) 1994-08-24

Family

ID=8212621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93102693A Withdrawn EP0612047A1 (fr) 1993-02-19 1993-02-19 Procédé pour analyser des signaux électroacoustiques

Country Status (1)

Country Link
EP (1) EP0612047A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2710834A1 (de) * 1976-03-16 1977-09-22 Elliott Brothers London Ltd Einbruch-alarmsystem
DE2710877A1 (de) * 1976-03-16 1977-11-24 Elliott Brothers London Ltd Einbruch-alarmsystem
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
DE3504552A1 (de) * 1985-02-11 1986-08-14 Wurm, Fritz, 4600 Dortmund Installationslos arbeitende alarmausloesevorrichtung und apparat
US4803468A (en) * 1987-05-08 1989-02-07 Ktv Sicherheitstechnik Gmbh Security fence with security wires fastened to posts via sensors
EP0357539A2 (fr) * 1988-08-03 1990-03-07 Rabbit Systems, Inc. Détecteur à infra-sons et alarme à adaptant référence adaptée
EP0448290A2 (fr) * 1990-03-14 1991-09-25 Geoquip Limited Système de détection d'intrusion et circuit de traitement du signal pour un tel système

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2710834A1 (de) * 1976-03-16 1977-09-22 Elliott Brothers London Ltd Einbruch-alarmsystem
DE2710877A1 (de) * 1976-03-16 1977-11-24 Elliott Brothers London Ltd Einbruch-alarmsystem
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
DE3504552A1 (de) * 1985-02-11 1986-08-14 Wurm, Fritz, 4600 Dortmund Installationslos arbeitende alarmausloesevorrichtung und apparat
US4803468A (en) * 1987-05-08 1989-02-07 Ktv Sicherheitstechnik Gmbh Security fence with security wires fastened to posts via sensors
EP0357539A2 (fr) * 1988-08-03 1990-03-07 Rabbit Systems, Inc. Détecteur à infra-sons et alarme à adaptant référence adaptée
EP0448290A2 (fr) * 1990-03-14 1991-09-25 Geoquip Limited Système de détection d'intrusion et circuit de traitement du signal pour un tel système

Similar Documents

Publication Publication Date Title
DE69331181T2 (de) Tonverstärkervorrichtung mit automatischer Unterdrückung akustischer Rückkopplung
DE60028779T2 (de) Rückkopplungsanullierung mit niederfrequenzeingang
DE19934171B4 (de) Filtersystem und -verfahren
DE2710877C2 (de) Einbruch-Alarmsystem
DE102006000798A1 (de) Erfassungssystem und Verfahren zur Feststellung eines darin bestehenden Alarmzustands
DE3315150A1 (de) Selbsttaetige lautstaerke-regelvorrichtung
DE2900444C2 (fr)
DE2710834C2 (de) Einbruch-Alarmsystem
DE102019100722A1 (de) Erkennung von Spitzen und Fehlern in Schwingungstrendddaten
DE3733983A1 (de) Verfahren zum daempfen von stoerschall in von hoergeraeten uebertragenen schallsignalen
DE102009058797B4 (de) Verfahren zum Ausführen einer Infraschall-Einbruchsdetektion
DE69936402T2 (de) Feuchtigkeitssensor mit digitaler signalverarbeitungsfilterung
EP1092964B1 (fr) Dispositif de reconnaisance et séparation du bruit
DE69626666T2 (de) Elektronisches warenüberwachungssystem mit kammfilterung und falschalarmunterdrückung
DE4103912C2 (de) Verfahren und Einrichtung zur Bekämpfung von Schnarchen
EP0612047A1 (fr) Procédé pour analyser des signaux électroacoustiques
DE3835744A1 (de) Vorrichtung zur signaldurchschnittsbildung
DE102019213697A1 (de) Verfahren zum Erkennen einer Annäherung und/oder Entfernung eines Einsatzfahrzeugs relativ zu einem Fahrzeug
AT500235A1 (de) System und verfahren zur automatischen überwachung eines verkehrsweges
DE102018118592A1 (de) Automobilregendetektor unter verwendung psycho-akustischer metriken
EP1458216A2 (fr) Appareil et procédé à l'adaption de microphones dans une prothèse auditive
DE2362039C3 (de) Schaltungsanordnung zur Abtrennung von Störsignalen aus einem physiologischen elektrischen Meßsignal
DE3810068C2 (fr)
DE19949637A1 (de) Verfahren und Vorrichtungen zur Geräuscherkennung und -trennung sowie Lärmüberwachung und -prognose
DE102020215553A1 (de) Verfahren zur Ausgabe eines Warnsignals durch ein Steuergerät eines mit Umfeldsensoren ausgestatteten Fahrzeugs

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19950225