FR2489225A1 - Motor vehicle antitheft device using audio feedback detection - uses electronic circuit having quartz crystal audio receiver and transmitter in loop closed by audio feedback, to detect entry to vehicle - Google Patents

Motor vehicle antitheft device using audio feedback detection - uses electronic circuit having quartz crystal audio receiver and transmitter in loop closed by audio feedback, to detect entry to vehicle Download PDF

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Publication number
FR2489225A1
FR2489225A1 FR8019067A FR8019067A FR2489225A1 FR 2489225 A1 FR2489225 A1 FR 2489225A1 FR 8019067 A FR8019067 A FR 8019067A FR 8019067 A FR8019067 A FR 8019067A FR 2489225 A1 FR2489225 A1 FR 2489225A1
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FR
France
Prior art keywords
audio
audio feedback
vehicle
receiver
transmitter
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Withdrawn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
FR8019067A
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French (fr)
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Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR8019067A priority Critical patent/FR2489225A1/en
Publication of FR2489225A1 publication Critical patent/FR2489225A1/en
Withdrawn legal-status Critical Current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
    • G08B13/1609—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems
    • G08B13/1618—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means
    • G08B13/1627—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means using Doppler shift detection circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B60R25/1004—Alarm systems characterised by the type of sensor, e.g. current sensing means

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

An electronic amplifier circuit amplifies audio (6kHz) signals received by a quartz crystal receiver and applies the signals to a quartz crystal transmitter operating at the same frequency. Sustained oscillations in the circuit are maintained by audio feedback between transmitter and receiver crystals. The presence of a person in the vehicle cabin reduces the audio feedback and this reduction is detected and amplified by an operational amplifier circuit whose output is used to drive a transistor pair which activates an alarm and also draws large current from the battery to prevent starting of the vehicle. The amplifier circuit comprises two CMOS inverters. The quartz crystals are enclosed in a perforated plastics package.

Description

L'invention qui sera décrit ci-après concerne un nouveau dispositif pour la protection des véhicules automobiles contre le vol permettant de detecter l'intrusion d'un individu dans l'hebitacle
De nombreux systemes de protection existent, mais ils présentent plusieurs types d'inconvénients :
- Montage difficile, nécessitant de nombreuses connexions ou système électrique du véhicule.The invention which will be described below relates to a new device for protecting motor vehicles against theft making it possible to detect the intrusion of an individual into the passenger compartment
Many protection systems exist, but they have several types of drawbacks:
- Difficult assembly, requiring numerous connections or electrical system of the vehicle.

- Risques de faux déclenchements. - Risk of false trips.

- Coûts de fabrication élevés. - High manufacturing costs.

- Aucun effet de dissuasion, la présence d'un système antivol n'étant pas décalable de l'extérieur
L'objet de la présente invention est de fournir un système sbr et efficace, pouvant être fabriqué pour un prix de revient trés bas et manisfestant de façon perceptible le fait que le véhicule est protégé par un système d'alarme. - No deterrent effect, the presence of an anti-theft system cannot be offset from the outside
The object of the present invention is to provide a sbr and efficient system which can be manufactured for a very low cost price and which perceptibly manifests the fact that the vehicle is protected by an alarm system.

La description sera illustréepar la planche ci-après. The description will be illustrated by the plate below.

Le dispositif détecte les variations du niveau d'un signal sonore émis par un circuit électronique et un transmetteur sonore, et recueillies par un capteur électro-acoustique. The device detects variations in the level of a sound signal emitted by an electronic circuit and a sound transmitter, and collected by an electro-acoustic sensor.

Le.capteur est constitué d'une pastille de quartz résonnant à une fréquence de l'ordre de 6000Ht.. Un amplificateur compose de deux inverseurs CMOS Linéarisés (1 et 2) transmet le signal à lté- metteur acoustique, qui est constitué d'une pastille de quartz iden tique au capteur
Les pastilles de quartz sont enfermées dans un petit boitier en matière plastique percé d'un trou pour en améliorer le rendement acoustique , et le boitier est fixé au circuit imprimé supportant las composants par l'intermédiaire d'un bloc de matière légère et peu rigide, du polyethylène expansé par exemple, de façon à ne pas perturbe la fréquence de résonnance des quartz
L'ensemble oscille à lafréquence de résonnante propre des quartz lorsque le coefficent d'empli,icatiOn est suffisant.The sensor consists of a quartz pellet resonating at a frequency of the order of 6000Ht. An amplifier consists of two Linearized CMOS inverters (1 and 2) transmits the signal to the acoustic transmitter, which consists of a quartz tablet identical to the sensor
The quartz pellets are enclosed in a small plastic case pierced with a hole to improve its acoustic performance, and the case is fixed to the printed circuit supporting the components by means of a block of light and not very rigid material , expanded polyethylene for example, so as not to disturb the resonance frequency of the quartz
The whole oscillates at the proper resonant frequency of the quartz when the usage coefficient is sufficient.

La frequence choisie est dars le domaine audible. Elle est suffisamment élévée pour être très fortement atténuée par les vitre et les tôles du véhicule, mais le son est cependant de I'extérieu
perceptible
De ce fait, on sait, en approchant d'un véhicule, si celui-ci est équipé du dispositif. The frequency chosen is in the audible range. It is high enough to be very strongly attenuated by the windows and sheets of the vehicle, but the sound is however from the outside.
perceptible
Therefore, we know, when approaching a vehicle, if it is equipped with the device.

Le niveau sonore ainsi créé dans l'habitacle dépend très étroitement des conditions de réverbération. The sound level thus created in the passenger compartment depends very closely on the reverberation conditions.

Les conditions varient très nettement lorsqu'un corps pénètre dans l'habitacle ou s'y déplace. Conditions vary greatly when a body enters or moves inside the passenger compartment.

L'amplitude du signal, recueilli en A, est redressée et amplifiée par le circuit 3, puis est à nouveau amplifiée par le circuit 4 et l'amplificateur opérationnel 5. The amplitude of the signal, collected at A, is rectified and amplified by circuit 3, then is again amplified by circuit 4 and the operational amplifier 5.

Les variations de tension à la sortie de celui-ci sont transmises par un condensateur à la base d'un transistor 6 . Lorsque ce transistor est saturé, un courant passe dans la résistance 7. Cette résistance a une valeur suffisamment faible pour provoquer une chute de tension mesurable à la batterie du véhicule (quelques dizaines de millivolts). Cette chute de tension peut donc provoquer le déclenchement d'un système d'alarme qui mesure la tension de la batterie, appareil qui existe couramment sur le marché. The voltage variations at the output thereof are transmitted by a capacitor at the base of a transistor 6. When this transistor is saturated, a current flows through resistor 7. This resistor has a value low enough to cause a measurable voltage drop at the vehicle battery (a few tens of millivolts). This drop in voltage can therefore trigger an alarm system which measures the battery voltage, a device which currently exists on the market.

En se branchant au point 8, on peut également déclencher d'autres types d'alarme, qui se déclenchent par mise à la masse de l'une de leurs entrées. By connecting to point 8, you can also trigger other types of alarm, which are triggered by grounding one of their inputs.

Claims (6)

REVENDICATI ONS 1) Dispositif pour la protection des véhicules contre le vol1) Device for protecting vehicles against theft caractérisé en ce qu'il émet un signal acoustique audible characterized in that it emits an audible acoustic signal et mesure les variations de l'intensité de signal provoquée and measures variations in signal strength caused par les mouvements d'un corps dans l'habitacle. by the movements of a body in the passenger compartment. 2) Dipositif selon la revendication 1, caractérisé en ce que le signal sonore est généré par un émétteur acoustique relié à un récepteur acoustique par un amplificateur électronique.2) Device according to claim 1, characterized in that the sound signal is generated by an acoustic transmitter connected to an acoustic receiver by an electronic amplifier. 3) Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce que le signal acoustique est d'une fréquence et d'une intensité suffisante pour être perceptible de ltextérieur du véhicule.3) Device according to any one of the preceding claims, characterized in that the acoustic signal is of sufficient frequency and intensity to be perceptible from the inside of the vehicle. 4) Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce que l'émetteur et le récepteur acoustiques utilisés sont des pastilles de quartz résonnant à une fréquence bien déterminé de l'ordre de 6000 Hz, enfermées'dans-un boitier, percé d'un trou et monté sur un bloc d'une matière légère et souple, telle que polyéthylène expansé.4) Device according to any one of the preceding claims, characterized in that the acoustic transmitter and receiver used are quartz pellets resonating at a well-determined frequency of the order of 6000 Hz, enclosed in a housing, pierced a hole and mounted on a block of a light and flexible material, such as expanded polyethylene. 5) Dispositif selon l'une queonque-des revendications précédentes caractérisé en ce que l'amplificateur utilisé pour la création ae résonnance est composé de deux inverseurs CMOS linéarisés. 5) Device according to one queonque-of the preceding claims characterized in that the amplifier used for creating ae resonance is composed of two linearized CMOS inverters. 6) Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce que le signal obtenu pour le déclenchement, qui reflète les variations de l'amplitude du signal sonore, est utilisé pour permettre le passage d'un courant à travers une résistance, provoquant ainsi une chute de tension de la batterie.  6) Device according to any one of the preceding claims, characterized in that the signal obtained for triggering, which reflects the variations in the amplitude of the sound signal, is used to allow the passage of a current through a resistor, causing thus a drop in battery voltage.
FR8019067A 1980-09-04 1980-09-04 Motor vehicle antitheft device using audio feedback detection - uses electronic circuit having quartz crystal audio receiver and transmitter in loop closed by audio feedback, to detect entry to vehicle Withdrawn FR2489225A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8019067A FR2489225A1 (en) 1980-09-04 1980-09-04 Motor vehicle antitheft device using audio feedback detection - uses electronic circuit having quartz crystal audio receiver and transmitter in loop closed by audio feedback, to detect entry to vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8019067A FR2489225A1 (en) 1980-09-04 1980-09-04 Motor vehicle antitheft device using audio feedback detection - uses electronic circuit having quartz crystal audio receiver and transmitter in loop closed by audio feedback, to detect entry to vehicle

Publications (1)

Publication Number Publication Date
FR2489225A1 true FR2489225A1 (en) 1982-03-05

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FR8019067A Withdrawn FR2489225A1 (en) 1980-09-04 1980-09-04 Motor vehicle antitheft device using audio feedback detection - uses electronic circuit having quartz crystal audio receiver and transmitter in loop closed by audio feedback, to detect entry to vehicle

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FR (1) FR2489225A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19521194A1 (en) * 1995-06-10 1996-12-12 Telefunken Microelectron Monitoring method for openings, covered by glass panes, in closed and locked cabinets or cars

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2260114A1 (en) * 1974-02-04 1975-08-29 Technicon Instr
DE2617118A1 (en) * 1975-04-22 1976-11-11 Kretztechnik Gmbh Regulation for pulse echo ultrasonic testing arrangement - generates reference voltage dependent on rms values of max. echo voltage
US4008713A (en) * 1975-09-18 1977-02-22 The United States Of America Ultrasonic diagnostic technique utilizing switched gain signal processing
US4098130A (en) * 1977-03-11 1978-07-04 General Electric Company Energy reflection flaw detection system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2260114A1 (en) * 1974-02-04 1975-08-29 Technicon Instr
DE2617118A1 (en) * 1975-04-22 1976-11-11 Kretztechnik Gmbh Regulation for pulse echo ultrasonic testing arrangement - generates reference voltage dependent on rms values of max. echo voltage
US4008713A (en) * 1975-09-18 1977-02-22 The United States Of America Ultrasonic diagnostic technique utilizing switched gain signal processing
US4098130A (en) * 1977-03-11 1978-07-04 General Electric Company Energy reflection flaw detection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19521194A1 (en) * 1995-06-10 1996-12-12 Telefunken Microelectron Monitoring method for openings, covered by glass panes, in closed and locked cabinets or cars

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