WO1989000520A1 - Poste de radio pour vehicules automobiles avec dispositif anti-vol - Google Patents

Poste de radio pour vehicules automobiles avec dispositif anti-vol Download PDF

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Publication number
WO1989000520A1
WO1989000520A1 PCT/DE1988/000390 DE8800390W WO8900520A1 WO 1989000520 A1 WO1989000520 A1 WO 1989000520A1 DE 8800390 W DE8800390 W DE 8800390W WO 8900520 A1 WO8900520 A1 WO 8900520A1
Authority
WO
WIPO (PCT)
Prior art keywords
car radio
microprocessor
memory
transmitter
comparator
Prior art date
Application number
PCT/DE1988/000390
Other languages
German (de)
English (en)
Inventor
Günter LIHL
Original Assignee
Digatec Electronic Systems 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 Digatec Electronic Systems Gmbh filed Critical Digatec Electronic Systems Gmbh
Publication of WO1989000520A1 publication Critical patent/WO1989000520A1/fr

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/1409—Mechanical actuation by lifting or attempted removal of hand-portable articles for removal detection of electrical appliances by detecting their physical disconnection from an electrical system, e.g. using a switch incorporated in the plug connector
    • G08B13/1418—Removal detected by failure in electrical connection between the appliance and a control centre, home control panel or a power supply

Definitions

  • the invention relates to a car radio with anti-theft device, which a) a microprocessor to which a memory for coding for arming and disarming is assigned, b) a separate device for entering a code with an associated receiving device and c) at least one tuner, one LF amplifier and a display unit.
  • the sound output signal is switched off when it is determined by means of the microprocessor that the external voltage supply has been interrupted.
  • the known car radio has a code setting device for setting an anti-theft code and a code entry device controlled by the microprocessor. The code supplied by the code setting device is only passed on to the microprocessor if an appropriate identification number has been entered via the code input arrangement.
  • a disadvantage of this previously known car radio is that by connecting an auxiliary voltage source, for example a small battery, which has the same voltage as the external motor vehicle battery, during an unauthorized removal, i.e. theft, of the car radio, the car radio is simulated that the voltage source is still is present, i.e. is not interrupted. If an auxiliary voltage source is connected before the known car radio is removed, the main voltage source can be interrupted without triggering an alarm or other consequences.
  • an auxiliary voltage source for example a small battery, which has the same voltage as the external motor vehicle battery
  • the device Even if a thief consciously accepts a possible alarm by deliberately knowing the battery cable when removing the known car radio cuts through, the device is not unusable as a result, it is sufficient to bridge the switch in the device that interrupts the LF path in order to be able to operate the previously known car radio.
  • the car radio can also be operated after the NF switch has been bridged if the identification code is not known. The latter can, however, be read out of the device, in particular for specialists, provided the device is stolen and can be opened and inspected in peace.
  • the receiving device is connected to a comparator which in turn is connected to the read-only memory, that the output of the comparator is connected to the microprocessor via an interrupt line and a status line, in that the Microprocessor is either inactive or active depending on the signal of the interrupt line, and that the microprocessor has a bus line with a synthesizer, the tuner, the AF amplifier and the display unit. is connected this controls.
  • Essential features of the invention are thus the combination of a microprocessor-controlled car radio and the connection of this microprocessor to the code device, which consists of the separate input device and the receiving device and which switches the microprocessor active or inactive.
  • the code device which consists of the separate input device and the receiving device and which switches the microprocessor active or inactive.
  • the entire car radio In the "arming" operating state, ie inactive microprocessor, the entire car radio is inactive. It cannot be switched on or operated. Even in the event of theft and after dismantling, the function of the device can no longer be established.
  • the car radio In the "disarmed" operating state, the car radio can be operated as normal, it is enabled.
  • the safety device thus acts on the individual components of the actual car radio via the microprocessor. Since the microprocessor controls all essential functions of the actual car radio via the bus line, the car radio is inactive without the function of the microprocessor and is therefore practically worthless, the microprocessor is, so to speak, the "heart" of the car radio, without which a function is not possible ⁇ is. This has the consequence that the car radio cannot be put into operation by intervening in the individual stages, for example tuner, LF amplifier or display unit.
  • the disadvantage of the car radio of the type mentioned, in which the car radio function can be restored by simple measures, namely by bridging the switch iti NF branch, is not present in the car radio according to the invention, this can only be put back into operation be when its microprocessor is started.
  • the interaction between the microprocessor and the code device can, however, be secured sufficiently electrically and mechanically that successful interventions in this area are practically impossible.
  • the electrical and mechanical protection can be designed so securely that it will not be possible even for a specialist who examines a stolen device in peace and with all technical aids to change the microprocessor from the "inactive" state to the "active” state "to bring back.
  • the comparator, the read-only memory and the microprocessor are housed in a single semiconductor component, access to the interrupt line is practically impossible, at least only possible if the component itself is opened and the internal interrupt connection is found. In any case, external access is only possible via the code signal, which is usually not available to a thief and is stored in the separate device for input.
  • the comparator, read-only memory and microprocessor are accommodated in a mechanically encapsulated part of the car radio, for example in a metal fuse box, access to the three levels mentioned is extremely difficult, and in general there is generally no access to the interior possible.
  • the mechanical fuse can at the same time be connected to an electronic measure, for example, after opening the security box, a switch is actuated, which deletes the memory content of the microprocessor. Even after access to the interior of the fuse box, the car radio can only be brought into a functional state if the internal processing program of the microprocessor is reloaded.
  • a second input code is stored in the car radio, which is created individually for each car radio and is only known to the manufacturer of the car radio, this code is deposited in a safe. If the rightful owner of the car radio turns to the manufacturer with a corresponding proof, he receives a second key, which first sends out the additional code, but then works like the normal first key.
  • the two-way connection between transmitter and receiver is fundamentally advantageous for the receiver to acknowledge the information provided by the transmitter.
  • a characteristic feature of the invention is that the microprocessor is inactive in the armed state of the safety device and cannot be brought back into the active state without special knowledge of information which is accommodated in the separate input device.
  • the state of "stolen” is generally detected by the safety device according to the prior art in that the car radio is connected in some form to the motor vehicle in which it is installed and when this connection is released (for example connection to the motor vehicle -Battery, contact with the slide-in bracket, etc.) an alarm is triggered.
  • the triggering of an alarm is not primarily intended or intended, but it should not be ruled out either.
  • the decisive factor for the invention is not the triggering of an alarm, but rather the deactivation of the car radio in the "armed" state. In this state, the car radio - regardless of whether it is stolen or not - is worthless for a user and can only be used if the separate input device is present and is being used.
  • the moment of theft is therefore not detected by the security device, but is in principle switched to security if this is specified via the separate input device.
  • An additional alarm is advantageous, however, it can be used, for example, to save the memory content for the program memory of the To completely erase the microprocessor, so that a thief is additionally prevented from putting the car radio into a functional state.
  • the separate input device in which the data necessary for activating the car radio is stored, can be designed in any way: it can interact mechanically, for example via contacts, with the actual car radio. In general, however, it is remote-acting, for example it contains an acoustic, optical or electromagnetic transmitter, and the receiving device is accordingly designed in the actual car radio.
  • Fig. 1 is a schematic diagram in the form of a block diagram of a car radio with safety device
  • FIG. 2 shows a schematic diagram for the arrangement of the comparator, microprocessor and associated parts in an encapsulated area, including illustration of further security measures.
  • the car radio shown in Fig. 1 has a synthesizer tuning system. In this case, high-frequency signals are received in a known manner by means of an antenna 20 and fed to a tuner. An EM tuner 22 and an AM tuner 24 are shown. These are connected via a line 26 to a synthesizer 28, the latter supplying the respective active tuners 22, 24 a tuning voltage which is used to provide a frequency in the tuner generate which is mixed with a received RF signal so that a predetermined intermediate frequency is obtained. This is amplified and demodulated in a stage 30 designated "IF / Demodulator" and passed on to a LF part via a line 32. The switchover between the provided tuners 22, 24 takes place by means of a range selection stage 36.
  • Synthesizer 28, LF part 34 and range selection stage 36 are connected to one another via a bus line 38, to which a microprocessor 40 and a display unit 42 are also connected.
  • the microprocessor 40 controls the actual car radio via this bus line 38.
  • the microprocessor 40 is connected to a keyboard 44, this is done via a line 46. If an input frequency is set or specified via this keyboard 44 directly or via its transmitter search device, this is passed on to the microprocessor 40 using the synthesizer 28, which automatically prejudges the corresponding leveling.
  • the microprocessor 40 not only controls the tuners 22, 24 and the synthesizer 28 via the internal bus line 38, but also on the one hand the volume in the LF part 34 and on the other hand the display unit 42, on the output side with the actual display 48, both for example, an LCD display is connected.
  • the microprocessor 40 in such a car radio is out of operation, ie inactive, no function of the car radio is possible.
  • the keyboard 44 directly connected to the microprocessor 40 has no effect, since it is only connected to the microprocessor 40 and only via this to the other stages. Tuning the tuners 22 or 24 is also impossible because the microprocessor 40 is also required for this. Control of the LF output is on - without a control signal the bus line 38 - not feasible. There is also no display since the display unit 42 does not receive any information via the bus line 38.
  • An interrupt input of the microprocessor 38 is connected via a line 52 to the output of a comparator 53.
  • a memory 54 designated RAM in FIG. 1, is assigned to this and on the input side it is connected to a receiver 56 which interacts with a transmitter 58.
  • the transmitter 58 forms the separate device for entering a code, the receiver 56 is the associated receiving device.
  • the transmitter and receiver 56, 58 optically communicate, other designs are possible.
  • the transmitter 58 If the transmitter 58 is actuated, it sends out a packet of information. This is received by the receiver 56 and passed on to the comparator 53. This compares the information received by the receiver 56 with the information stored in the RAM 54. If the two items of information match, then an output takes place on the interrapt line 52. The microprocessor 40 is then alternatively blocked or released.
  • a status line 60 is additionally provided, which connects the microprocessor 40 on the input side to the output of the comparator 53. It shows the state in which the microprocessor 40 is located. It is also linked to a time loop 62 which, in a known manner, blocks access to the microprocessor 40 for a predetermined period of time which increases as a function of the number of failed attempts.
  • a memory 64 is connected to the microprocessor 40, in which the program and the data for the work processes are located in the microprocessor 40.
  • This memory needs a voltage source for the memory function, therefore it is assigned an internal battery 66, which is preferably designed in the form of a small accumulator or as a lithium battery.
  • This battery 66 ensures that the content of the memory 64 is retained even when an external current supply is present Supply, in particular the power supply via the motor vehicle battery, is interrupted.
  • the RAM 54 is a non-volatile memory that does not require a power supply to store its data. The same applies to the data memory in the transmitter 58, this is preferably a so-called fuseable ROM.
  • the microprocessor 40, the comparator 53 and the two memories 54, 64 are located within a mechanically protected area 68, indicated by dashed lines in FIG. 1, which can be seen in more detail in FIG. 2.
  • a metal capsule 70 which is closed on all sides and has a number of insulated bushings 72 on two sides.
  • an alarm transmitter or load resistor 74 In the interior of the metal capsule 70 are the parts surrounded by the dashed line 68 in FIG. 1 and additionally an alarm transmitter or load resistor 74. This is used as follows: Some of the connections to the bushings 72 are via resistors which are located on the Printed circuit board 76 are connected together.
  • this loop is severed by severing one of the relevant connections 78, in particular by unsoldering the printed circuit board 76, and if the microprocessor is also inactive, either the alarm signal sounds via the alarm transmitter 74, which at the same time loads the battery 66 and is exhausted after a certain time. As a result, the content of the memory 64 is erased. In the event of a load resistance instead of the alarm transmitter 74, no alarm is triggered, but the same effect is achieved, that is to say the information present in the memory 64 is deleted.
  • the lithium battery 66 is also accommodated within the capsule 70, it is connected with its one pole, preferably the negative pole, to the metallic wall of the capsule 70 and is only connected via this to the corresponding line on the printed circuit board, so that the battery connection is interrupted as soon as an attempt is made to open the capsule 70. If the power supply to the memory is interrupted, the Content of memory 64 no longer maintained, that is to say erased. With its other pole, the battery 70 is connected to the printed circuit board in an easily accessible manner. This connection can be opened in a targeted manner if one wishes to delete the contents of the memory.
  • the printed circuit board 76 is connected to a four-wire line 80, via which the power supply, that is to say the connection to a motor vehicle battery, takes place.
  • Two wires of this line 80 are used for the actual power supply, the other two wires are used for an alarm loop, it being possible that one wire can also be used as a stand-by line.
  • the alarm loop is terminated in an associated socket 82 with a resistor. If this socket 82 is disconnected from the associated plug 84 or if the line 80 is cut through, the alarm loop is open; an alarm is output in a known manner, in particular via a built-in loudspeaker or the alarm transmitter 74.
  • microswitch 86 is provided which is opened when the radio is pulled out of its holder.
  • the comparator switches through after checking the first part, that is to say the RAM information, and allows the further information to reach the microprocessor 40 via the status line 60 so that it can be stored in the memory 64 . They remain stored there until a new command from transmitter 58 is issued again. With this new command, the stored information is first deleted and then the microprocessor 40 is switched to inactive.
  • a further improvement is achieved in that the microprocessor 40, the comparator 62 and the two memories 54, 64 are accommodated on a semiconductor substrate and thus in a housing.
  • the lines 52, 60 are only after opening the housing of the Semiconductor device accessible. This can also be accommodated in a capsule 70, as described above.
  • Data can only be read into the memory 64 via an interface, which only enables data transfer to the memory 64, but not from it.
  • a photodiode 77 is provided, which is embedded in the wall of the capsule 70 and is firmly connected to it. This diode 77 is supplied with the data via a T.F ⁇ (diode), which is not provided in the car radio. Reading the data from the memory 64 is extremely difficult as a result.
  • the coding of the information contained in the RAM memory 54 and thus also in the transmitter 58 takes place at the manufacturer of the car radio and is known only to a very small group of employees. The relevant information is kept inaccessible to the general public.
  • a random generator is used in the selection of the identification information in order to avoid that the coding is recognized on the basis of a continuous law.
  • the transmitter 58 is made as small as possible, it is the size of a key fob. If it is lost, another electronic key with the correct coding can be produced by presenting a proof of purchase and the serial number.
  • the information output by the transmitter 58 is either encrypted or modified by double modulation in such a way that the content cannot be decrypted by querying the emitted signal.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

Un poste de radio pour véhicules automobiles avec dispositif anti-vol comprend un microprocesseur (40) relié à une mémoire (54) d'enregistrement de codes de syntonisation aiguë et floue, un agencement de réception (récepteur 56), au moins un syntoniseur (22, 24), un organe de basse fréquence et une unité d'affichage (48). Le récepteur (56) est connecté à un comparateur (53) qui à son tour est relié à la mémoire (54). La sortie du comparateur (53) est connectée au travers d'une ligne d'interruption (52) avec le microprocesseur (40) qui est validé ou invalidé en fonction du signal transmis par la ligne d'interruption (523). Le microprocesseur est connecté par une ligne de bus (38) avec un synthétiseur (28), avec le syntoniseur (22, 24), avec l'organe de basse fréquence (34) et avec l'unité d'affichage (48), et commande tous ces éléments.
PCT/DE1988/000390 1987-07-20 1988-06-29 Poste de radio pour vehicules automobiles avec dispositif anti-vol WO1989000520A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873723931 DE3723931A1 (de) 1987-07-20 1987-07-20 Autoradio mit diebstahlsicherung
DEP3723931.7 1987-07-20

Publications (1)

Publication Number Publication Date
WO1989000520A1 true WO1989000520A1 (fr) 1989-01-26

Family

ID=6331941

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1988/000390 WO1989000520A1 (fr) 1987-07-20 1988-06-29 Poste de radio pour vehicules automobiles avec dispositif anti-vol

Country Status (3)

Country Link
EP (1) EP0376951A1 (fr)
DE (1) DE3723931A1 (fr)
WO (1) WO1989000520A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0544528A1 (fr) * 1991-11-27 1993-06-02 Fujitsu Limited Système de protection d'information secrète
DE4240458C1 (de) * 1992-12-02 1993-12-23 Grundig Emv Vorrichtung zum Schutz von Kraftfahrzeugen und darin befindlichen elektronischen Geräten vor Diebstahl
CH683413A5 (de) * 1991-12-05 1994-03-15 Roadstar Management S A Mit einer Diebstahl-Sicherung versehenes Musikgerät.
DE19708314A1 (de) * 1997-02-28 1998-09-03 Volkswagen Ag Vorrichtung und Verfahren zur Diebstahlsicherung von Zusatzgeräten

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8801717A (nl) * 1988-07-07 1990-02-01 Philips Nv Alleenstaande dienstverlenende inrichting met antidiefstalcode.
NL9002035A (nl) * 1990-09-17 1992-04-16 Philips Nv Microprocessor-bestuurd apparaat met uitschakelbare beveiliging tegen onbevoegd gebruik.
IT1252191B (it) * 1991-12-11 1995-06-05 Delta Elettronica Spa Apparecchiatura di sicurezza per un dispositivo elettronico ausiliariomontato su un mezzo di locomozione.
DE4325126C1 (de) * 1993-07-27 1995-01-12 Grundig Emv Aktivierungsschaltung zur Auslösung einer codegeschützten Diebstahlsicherung
FR2715492B1 (fr) * 1994-01-27 1996-09-20 Jean Noel Bruere Dispositif antivol électronique à codage pour appareils raccordés à un réseau électrique.
DE29514059U1 (de) 1995-09-01 1995-11-02 Hsieh, Shou-Tun, An-Chung St., Tainan Brille mit Haarreif
DE29514056U1 (de) * 1995-09-01 1995-10-26 f + g megamos Sicherheitselektronik GmbH, 51674 Wiehl Audioeinrichtung für Fahrzeuge, insbesondere für Kraftfahrzeuge
DE19627384A1 (de) * 1996-07-06 1998-01-08 Bosch Gmbh Robert Elektrisches Gerät, insbesondere CD-Wechsler, zum Anschluß an ein zweites elektrisches Gerät, insbesondere ein Autoradio
DE19634626C1 (de) * 1996-08-27 1998-06-10 Siemens Ag Demontagegeschützte elektrische Einrichtung
DE19804923A1 (de) * 1998-02-07 1999-08-19 Grundig Ag Vorrichtung zur Freischaltung eines elektronischen Gerätes
DE19815015A1 (de) † 1998-04-03 1999-10-07 Bosch Gmbh Robert Elektrisches Gerät
FR2778479A1 (fr) * 1998-05-05 1999-11-12 Pierre Marie Fortier Systeme anti vol de materiel electronique ou comportant de l'electronique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4494114A (en) * 1983-12-05 1985-01-15 International Electronic Technology Corp. Security arrangement for and method of rendering microprocessor-controlled electronic equipment inoperative after occurrence of disabling event
DE3637019A1 (de) * 1985-11-01 1987-05-07 Clarion Co Ltd Diebstahlsicherung fuer ein tongeraet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4494114A (en) * 1983-12-05 1985-01-15 International Electronic Technology Corp. Security arrangement for and method of rendering microprocessor-controlled electronic equipment inoperative after occurrence of disabling event
US4494114B1 (en) * 1983-12-05 1996-10-15 Int Electronic Tech Security arrangement for and method of rendering microprocessor-controlled electronic equipment inoperative after occurrence of disabling event
DE3637019A1 (de) * 1985-11-01 1987-05-07 Clarion Co Ltd Diebstahlsicherung fuer ein tongeraet

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0544528A1 (fr) * 1991-11-27 1993-06-02 Fujitsu Limited Système de protection d'information secrète
US5572696A (en) * 1991-11-27 1996-11-05 Fujitsu Limited Secret information protection system erasing secret information upon detection of authorized user-initiated event
US6167519A (en) * 1991-11-27 2000-12-26 Fujitsu Limited Secret information protection system
CH683413A5 (de) * 1991-12-05 1994-03-15 Roadstar Management S A Mit einer Diebstahl-Sicherung versehenes Musikgerät.
DE4240458C1 (de) * 1992-12-02 1993-12-23 Grundig Emv Vorrichtung zum Schutz von Kraftfahrzeugen und darin befindlichen elektronischen Geräten vor Diebstahl
EP0600431A1 (fr) * 1992-12-02 1994-06-08 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig GmbH & Co. KG Dispositif pour la protection des véhicules automobiles et des appareils électroniques se trouvant dans ces véhicules
DE19708314A1 (de) * 1997-02-28 1998-09-03 Volkswagen Ag Vorrichtung und Verfahren zur Diebstahlsicherung von Zusatzgeräten

Also Published As

Publication number Publication date
EP0376951A1 (fr) 1990-07-11
DE3723931A1 (de) 1988-06-16

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