EP0547725A1 - Arrangement for remote control of actuating means - Google Patents

Arrangement for remote control of actuating means Download PDF

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Publication number
EP0547725A1
EP0547725A1 EP92204018A EP92204018A EP0547725A1 EP 0547725 A1 EP0547725 A1 EP 0547725A1 EP 92204018 A EP92204018 A EP 92204018A EP 92204018 A EP92204018 A EP 92204018A EP 0547725 A1 EP0547725 A1 EP 0547725A1
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European Patent Office
Prior art keywords
message
remote control
permutation
key
elements
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EP92204018A
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German (de)
French (fr)
Inventor
Serge Destivelle
Adham Haydar
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Ste Texton
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Ste Texton
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/16—Electric signal transmission systems in which transmission is by pulses
    • G08C19/28—Electric signal transmission systems in which transmission is by pulses using pulse code

Definitions

  • the invention relates to an arrangement for remote control of an actuating device using a remote control device, of the type comprising an apparatus transmitting a command code message signal and a receiving device provided with means for recognition of the code and generator of a recognition confirmation signal and of the control means of the actuator device following the reception of said confirmation signal.
  • the object of the present invention is to propose a remote control arrangement, of the aforementioned type, which does not have the drawbacks of the state of the art.
  • the arrangement according to the invention is characterized in that the transmitting apparatus comprises means generating a code message comprising a fixed part consisting of a certain number of message elements and a part evolutive also consisting of a number of message elements, and means of permutation according to a predetermined permutation key, of the message elements in the latter, and the receiving device comprises means of repermutation of the message elements in the message received, according to said permutation key, to restore the initial order of the parties and their message elements.
  • the permutation key is communicated to the transmitting device and to the receiving device during the mounting of the actuator device in its operating environment such as a motor vehicle.
  • the sending apparatus comprises means for encrypting the message before or after the permutation operation, according to a predetermined encryption key
  • the receiving device comprises means for decryption as a function of said encryption key
  • the encryption key is variable but is transmitted with the command code message.
  • the transmitting means of the transmitting apparatus are adapted to code the message binarily so that each change in level of the message signal represents a passage from one logical state to the other, both Logical states are distinguished by the duration determined between two successive level changes.
  • the receiving device comprises anti-rebound means adapted to not take into account level changes of a short duration compared to the durations of the two logic states.
  • the remote control device 1 comprises a generator means GCf of an invariable message part A, a generator GCev of an evolving message part B, a generator means GCL of a keyword CL and a generator means GFO of a signal word of an FO function.
  • the signals from each of its generating means are applied to a serialization device DS so as to obtain the message illustrated in FIG. 2a.
  • This message is addressed to a means of permutation MP of the different parts and elements of the message as will be described later.
  • the swapped message reaches an encryption means MC and is then transmitted in the encrypted state by the transmitter E.
  • the message reaches the receiver element R of the receiver II of the actuator device.
  • the receiver essentially comprises a means of decryption MDC, a means of repermutation MRP of the received and decrypted message, a device for recognizing the message DR adapted to compare the received message with a stored CM code. When there is identity between the code contained in the message and the stored code, the receiver produces a control signal which will be transmitted to the actuator device III.
  • the message presents at the output of the DS commissioning device the structure illustrated in FIG. 2a.
  • the fixed part A comprises three elements A1 to A3 to which the values 1, 2 and 3 are respectively assigned.
  • the evolving part B also comprises three elements B1 to B3 having respectively the values 5, 5, 4. This part could evolve for example by incrementing or decrementing each time the remote control device is operated. Thus the element B3 could have the value at the next maneuver 5.
  • the key part CL comprises in the example two elements CL1, CL2 to which are assigned for example values 1 and 2.
  • the part of function does not include in the example chosen only one item.
  • FIG. 2b shows the structure of the message after the permutation operation carried out in the permutation means MP, according to an invariable permutation key which is communicated to the remote control device and to the receiver when the vehicle is paired in the factory.
  • the two elements CL1 and CL2 which make up the encryption key have not been separated and that only the position of the key part in the message has changed.
  • the message is encrypted according to the encryption key CL.
  • This key is random and of any known known nature.
  • encryption consists in retaining for each element its complement to 10, however with the exception of the key part CL which does not vary. Of course any other encryption algorithm could be retained.
  • the message is then transmitted in the structure illustrated in FIG. 2c to the receiver II where it will be decrypted according to the key CL which has been transmitted with the message and relayed according to the permutation key initially determined. The operations take place in the receiver II in the reverse order to that of the remote control device I.
  • FIG. 3 shows a mode of transmission of the binary coded message which makes it possible to reduce the message duration.
  • each high or low logic state is defined by a duration of predetermined time more or less long between two changes of state.
  • the low state "O” is determined by a time duration ⁇ t1 between two changes of state while the high state "1” is defined by a time duration ⁇ t2 longer than ⁇ t1.
  • two consecutive bits are easily detectable by the change of state even if these bits represent the same binary state.
  • the evolutionary algorithm of the evolutionary part could be different provided that the evolution is synchronous in the transmitting device and the receiver.
  • a change of the CL encryption key is not a problem since the encryption algorithm is defined by the key which is always transmitted with the message.
  • the number of message elements is also variable. Each element could for example consist of a byte or a half-byte or of an element of an even different composition. It is obvious that the various operations represented and described as being carried out by specific means can be carried out by computer devices programmed accordingly.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

The arrangement is characterised in that the remote control apparatus (I) includes means (GCf, GCev, GCL, GFO) generating a code message including a fixed part (A) made up of a certain number of message elements (A1-A3) and a changing part (B) also made up of a certain number of message elements (B1-B3), and means for permutation (MP) according to a predetermined permutation key, of the message elements in the latter, and in that the receiver device (II) comprises means of repermutation (MRP) of the message elements in the message received, according to the said permutation key, in order to reestablish the initial order of the parts and of their message elements. The invention can be used for motor vehicles. <IMAGE>

Description

L'invention concerne un agencement de commande à distance d'un dispositif actionneur à l'aide d'un appareil de télécommande, du type comprenant un appareil émetteur d'un signal de message de code de commande et un dispositif récepteur pourvu de moyens de reconnaissance du code et générateur d'un signal de confirmation de reconnaissance et des moyens de commande du dispositif actionneur à la suite de la réception dudit signal de confirmation.The invention relates to an arrangement for remote control of an actuating device using a remote control device, of the type comprising an apparatus transmitting a command code message signal and a receiving device provided with means for recognition of the code and generator of a recognition confirmation signal and of the control means of the actuator device following the reception of said confirmation signal.

Des agencements de ce type sont fréquemment utilisés dans le domaine des véhicules automobiles pour commander à distance, par exemple l'ouverture ou la fermeture des portes ou certains accessoires du véhicule. Ces agencements connus présentent l'inconvénient que le message de code de commande est facilement reconnaissable par des tiers. Par conséquent ces agencements n'assurent pas une protection satisfaisante contre des agissements non autorisées et frauduleuses.Arrangements of this type are frequently used in the field of motor vehicles for remote control, for example the opening or closing of doors or certain accessories of the vehicle. These known arrangements have the disadvantage that the command code message is easily recognizable by third parties. Consequently, these arrangements do not provide satisfactory protection against unauthorized and fraudulent acts.

La présente invention a pour but de proposer un agencement de commande à distance, du type susmentionné, qui ne présente pas les inconvénients de l'état de la technique.The object of the present invention is to propose a remote control arrangement, of the aforementioned type, which does not have the drawbacks of the state of the art.

Pour atteindre ce but, l'agencement selon l'invention est caractérisé en ce que l'appareil émetteur comporte des moyens générateurs d'un message de code comportant une partie fixe se composant d'un certain nombre d'éléments de message et une partie évolutive se composant également d'un certain nombre d'éléments de message, et des moyens de permutation selon une clé de permutation prédéterminée, des éléments de message dans ce dernier, et le dispositif récepteur comprend des moyens de repermutation des éléments de message dans le message reçu, selon ladite clé de permutation, pour rétablir l'ordre initial des parties et leurs éléments de message.To achieve this object, the arrangement according to the invention is characterized in that the transmitting apparatus comprises means generating a code message comprising a fixed part consisting of a certain number of message elements and a part evolutive also consisting of a number of message elements, and means of permutation according to a predetermined permutation key, of the message elements in the latter, and the receiving device comprises means of repermutation of the message elements in the message received, according to said permutation key, to restore the initial order of the parties and their message elements.

Selon une caractéristique avantageuse de l'invention, la clé de permutation est communiquée à l'appareil émetteur et au dispositif récepteur lors du montage du dispositif actionneur dans son environnement de fonctionnement tel qu'un véhicule automobile.According to an advantageous characteristic of the invention, the permutation key is communicated to the transmitting device and to the receiving device during the mounting of the actuator device in its operating environment such as a motor vehicle.

Selon une autre caractéristique avantageuse de l'invention, l'appareil émetteur comprend des moyens de cryptage du message avant ou après l'opération de permutation, selon une clé de cryptage prédéterminée, et le dispositif récepteur comporte des moyens de décryptage en fonction de ladite clé de cryptage.According to another advantageous characteristic of the invention, the sending apparatus comprises means for encrypting the message before or after the permutation operation, according to a predetermined encryption key, and the receiving device comprises means for decryption as a function of said encryption key.

Selon une autre caractéristique avantageuse de l'invention, la clé de cryptage est variable mais est transmise avec le message de code de commande.According to another advantageous characteristic of the invention, the encryption key is variable but is transmitted with the command code message.

Selon encore une autre caractéristique de l'invention, les moyens émetteurs de l'appareil émetteur sont adaptés pour coder le message binairement de façon que chaque changementde niveau du signal de message représente un passage d'un état logique à l'autre, les deux états logiques se distinguent par la durée déterminée entre deux changements de niveau successifs.According to yet another characteristic of the invention, the transmitting means of the transmitting apparatus are adapted to code the message binarily so that each change in level of the message signal represents a passage from one logical state to the other, both Logical states are distinguished by the duration determined between two successive level changes.

Selon encore une autre caractéristique avantageuse de l'invention, le dispositif récepteur comporte des moyens anti-rebonds adaptés pour ne pas prendre en compte des changements de niveau d'une faible durée par rapport aux durées des deux états logiques.According to yet another advantageous characteristic of the invention, the receiving device comprises anti-rebound means adapted to not take into account level changes of a short duration compared to the durations of the two logic states.

L'invention sera mieux comprise, et d'autres buts, caractéristiques, détails et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative qui va suivre faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention, et dans lesquels :

  • La figure 1 montre sous forme d'un schéma-bloc l'agencement de commande à distance selon l'invention.
  • Les figures 2a, b, c illustrent les trois opérations essentielles de codage du message de code de télécommande adressé à un dispositif actionneur par un appareil émetteur, dans l'agencement selon la figure 1.
  • La figure 3 illustrent le mode de transmission d'un message selon la présente invention.
  • La figure 1 illustre schématiquement un agencement selon l'invention par exemple pour la commande à distance d'un dispositif actionneur tel que le dispositif d'ouverture ou de fermeture des portes d'un véhicule automobile. L'agencement comprend un appareil de télécommande d'émetteur d'un signal de message de code de télécommande et un dispositif récepteur Il associé au dispositif actionneur indiqué en III.
The invention will be better understood, and other objects, characteristics, details and advantages thereof will appear more clearly during the explanatory description which follows, made with reference to the appended schematic drawings given solely by way of example illustrating a embodiment of the invention, and in which:
  • Figure 1 shows in the form of a block diagram the remote control arrangement according to the invention.
  • FIGS. 2a, b, c illustrate the three essential operations for coding the remote control code message addressed to an actuator device by a transmitting device, in the arrangement according to FIG. 1.
  • FIG. 3 illustrates the mode of transmission of a message according to the present invention.
  • Figure 1 schematically illustrates an arrangement according to the invention for example for the remote control of an actuator device such as the device for opening or closing the doors of a motor vehicle. The arrangement includes a remote control device for transmitting a remote control code message signal and a receiver device II associated with the actuator device indicated in III.

L'appareil de télécommande 1 comprend un moyen générateur GCf d'une partie de message invariable A, un générateur GCev d'une partie de message évolutive B, un moyen générateur GCLd'un mot de clé CL et un moyen générateur GFO d'un mot indicateur d'une fonction FO. Les signaux en provenance de chacun de ses moyens générateurs sont appliqués à un dispositif de mise en série DS de façon à obtenir le message illustré à la figure 2a. Ce message est adressé à un moyen de permutation MP des différentes parties et éléments du message comme cela sera décrit plus loin. Le message permuté parvient à un moyen de cryptage MC et est ensuite émis à l'état crypté par l'émetteur E.The remote control device 1 comprises a generator means GCf of an invariable message part A, a generator GCev of an evolving message part B, a generator means GCL of a keyword CL and a generator means GFO of a signal word of an FO function. The signals from each of its generating means are applied to a serialization device DS so as to obtain the message illustrated in FIG. 2a. This message is addressed to a means of permutation MP of the different parts and elements of the message as will be described later. The swapped message reaches an encryption means MC and is then transmitted in the encrypted state by the transmitter E.

Le message parvient à l'élément récepteur R du récepteur Il du dispositif actionneur. Le récepteur comprend essentiellement un moyen de décryptage MDC, un moyen de repermutation MRP du message reçu et décrypté, un dispositif de reconnaissance du message DR adapté pour comparer le message reçu à un code CM mémorisé. Lorsqu'il y a identité entre le code contenu dans le message et le code mémorisé, le récepteur produit un signal de commande qui sera transmis au dispositif actionneur III.The message reaches the receiver element R of the receiver II of the actuator device. The receiver essentially comprises a means of decryption MDC, a means of repermutation MRP of the received and decrypted message, a device for recognizing the message DR adapted to compare the received message with a stored CM code. When there is identity between the code contained in the message and the stored code, the receiver produces a control signal which will be transmitted to the actuator device III.

En se référant à la figure 2, on décrira ci-après les modes de codage et de décodage que le message de télécommande subit dans l'appareil de télécommande 1 et le récepteur Il associé au dispositif actionneur III.Referring to FIG. 2, the coding and decoding modes that the remote control message undergoes in the remote control device 1 and the receiver II associated with the actuator device III will be described below.

Comme il a été indiqué plus haut, le message présente à la sortie du dispositif de mise en service DS la structure illustrée à la figure 2a. On constate que la partie fixe A comporte trois éléments A1 à A3 auxquels sont attribués les valeurs respectivement 1, 2 et 3. La partie évolutive B comporte également trois éléments B1 à B3 présentant respectivement les valeurs 5, 5, 4. Cette partie pourrait évoluer par exemple par incrémentation ou décrémentation à chaque manoeuvre de l'appareil de télécommande. Ainsi l'élément B3 pourrait avoir à la prochaine manoeuvre la valeur 5. La partie de clé CL comporte dans l'exemple deux éléments CL1, CL2 auxquels sont attribués par exemple des valeurs 1 et 2. La partie de fonction ne comporte dans l'exemple choisi qu'un seul élément. La figure 2b montre la structure du message après l'opération de permutation réalisée dans les moyens de permutation MP, selon une clé de permutation invariable qui est communiquée à l'appareil de télécommande et au récepteur lors de l'appairage du véhicule en usine.As indicated above, the message presents at the output of the DS commissioning device the structure illustrated in FIG. 2a. It can be seen that the fixed part A comprises three elements A1 to A3 to which the values 1, 2 and 3 are respectively assigned. The evolving part B also comprises three elements B1 to B3 having respectively the values 5, 5, 4. This part could evolve for example by incrementing or decrementing each time the remote control device is operated. Thus the element B3 could have the value at the next maneuver 5. The key part CL comprises in the example two elements CL1, CL2 to which are assigned for example values 1 and 2. The part of function does not include in the example chosen only one item. FIG. 2b shows the structure of the message after the permutation operation carried out in the permutation means MP, according to an invariable permutation key which is communicated to the remote control device and to the receiver when the vehicle is paired in the factory.

On constate que les deux éléments CL1 et CL2 qui composent la clé de cryptage n'ont pas été séparés et que seulement la position de la partie de clé dans le message a changée. Après la permutation, le message est crypté selon la clé de cryptage CL. Cette clé est aléatoire et de toute nature connue appropriée. Dans l'exemple représenté, le cryptage consiste à retenir pour chaque élément son complément à 10, cependant à l'exception de la partie de clé CL qui ne varie pas. Bien entendu toute autre algorithme de cryptage pourrait être retenu. Le message est ensuite transmis dans la structure illustrée par la figure 2c au récepteur Il où il sera décrypté selon la clé CL qui a été transmise avec le message et repermuté selon la clé de permutation initialement déterminée. Les opérations se déroulent dans le récepteur Il dans l'ordre inverse à celui de l'appareil de télécommande I.It can be seen that the two elements CL1 and CL2 which make up the encryption key have not been separated and that only the position of the key part in the message has changed. After the permutation, the message is encrypted according to the encryption key CL. This key is random and of any known known nature. In the example shown, encryption consists in retaining for each element its complement to 10, however with the exception of the key part CL which does not vary. Of course any other encryption algorithm could be retained. The message is then transmitted in the structure illustrated in FIG. 2c to the receiver II where it will be decrypted according to the key CL which has been transmitted with the message and relayed according to the permutation key initially determined. The operations take place in the receiver II in the reverse order to that of the remote control device I.

On comprend aisément que la reconnaissance du message par des tierces personnes est d'autant plus difficile à réaliser que le nombre des éléments du message augmente. La figure 3 montre un mode de transmission du message codé de façon binaire qui permet de réduire la durée de message. On constate que chaque état logique haut ou bas est défini par une durée de temps prédéterminé plus ou moins long entre deux changements d'état. Ainsi l'état bas "O" est déterminé par une durée de temps Δt1 entre deux changements d'état tandis que l'état haut "1" est défini par une durée de temps Δt2 plus long que Δt1. Dans ce mode de transmission deux bits qui se suivent sont facilement détectables par le changement d'état même si ces bits représentent le même état binaire.It is easy to understand that the recognition of the message by third parties is all the more difficult to achieve as the number of elements of the message increases. FIG. 3 shows a mode of transmission of the binary coded message which makes it possible to reduce the message duration. It is noted that each high or low logic state is defined by a duration of predetermined time more or less long between two changes of state. Thus the low state "O" is determined by a time duration Δt1 between two changes of state while the high state "1" is defined by a time duration Δt2 longer than Δt1. In this transmission mode, two consecutive bits are easily detectable by the change of state even if these bits represent the same binary state.

Bien entendu de multiples modifications peuvent être apportées à l'exemple de réalisation qui vient d'être décrit en se reportant aux figures. L'algorithme d'évolution de la partie évolutive pourrait être différent à condition que l'évolution soit synchrone dans l'appareil émetteur et le récepteur. Un changement de la clé de cryptage CL ne constitue aucun problème dans la mesure où algorithme de cryptage est défini par la clé qui est toujours transmise avec le message. Le nombre des éléments de message est également variable. Chaque élément pourrait par exemple être constitué par un octet ou un demi-octet ou d'un élément d'une composition encore différente. Il est évident que les différentes opérations représentées et décrites comme étant exécutées par des moyens spécifiques peuvent être réalisées par des dispositifs ordinateurs programmés en conséquence.Of course, multiple modifications can be made to the embodiment which has just been described with reference to the figures. The evolutionary algorithm of the evolutionary part could be different provided that the evolution is synchronous in the transmitting device and the receiver. A change of the CL encryption key is not a problem since the encryption algorithm is defined by the key which is always transmitted with the message. The number of message elements is also variable. Each element could for example consist of a byte or a half-byte or of an element of an even different composition. It is obvious that the various operations represented and described as being carried out by specific means can be carried out by computer devices programmed accordingly.

Claims (6)

1. Agencement de commande à distance d'un dispositif actionneur à l'aide d'un appareil de télécommande, du type comprenant un appareil émetteur d'un signal de message de code de commande, un dispositif récepteur pourvu de moyens de reconnaissance du code et généra- teurd'un signal de confirmation de reconnaissance et des moyens de commande du dispositif actionneur à la suite de la réception dudit signal de confirmation, caractérisé en ce que l'appareil de télécommande (I) comporte des moyens générateurs (GCf, GCev, GCL, GFO) d'un message de code comportant une partie fixe (A) se composant d'un certain nombre d'éléments de message (A1-A3) et une partie évolutive (B) se composant également d'un certain nombre d'élément de message (B1-B3), et des moyens de permutation (MP) selon une clé de permutation prédéterminée, des éléments de message dans ce dernier, et en ce que le dispositif récepteur (II) comprend des moyens de repermutation (MRP) des éléments de message dans le message reçu, selon ladite clé de permutation, pour rétablir l'ordre initial des parties et de leurs éléments de message.1. Arrangement for the remote control of an actuating device using a remote control device, of the type comprising a device transmitting a command code message signal, a receiving device provided with means for recognizing the code and generator of a recognition confirmation signal and of the control means of the actuating device following the reception of said confirmation signal, characterized in that the remote control device (I) comprises generating means (GCf, GCev , GCL, GFO) of a code message comprising a fixed part (A) consisting of a certain number of message elements (A1-A3) and an evolving part (B) also consisting of a number message element (B1-B3), and permutation means (MP) according to a predetermined permutation key, message elements in the latter, and in that the receiving device (II) comprises repermutation means ( MRP) elements of me in the message received, according to said permutation key, to restore the initial order of the parties and their message elements. 2. Agencement selon la revendication 1, caractérisé en ce que la clé de permutation est communiquée à l'appareil de télécommande émetteur (I) et au dispositif récepteur (II) lors du montage du dispositif actionneur (III) dans son environnement de fonctionnement, tel qu'un véhicule automobile.2. Arrangement according to claim 1, characterized in that the permutation key is communicated to the transmitter remote control device (I) and to the receiver device (II) during the mounting of the actuator device (III) in its operating environment, such as a motor vehicle. 3. Agencement selon l'une des revendications 1 ou 2, caractérisé en ce que l'appareil de télécommande (I) comprend des moyens de cryptage (MC) du message avant ou après l'opération de permutation, selon une clé de cryptage prédéterminée (CL), et le dispositif récepteur (II) comporte des moyens de décryptage (MDC) en fonction de ladite clé de cryptage (CL).3. Arrangement according to one of claims 1 or 2, characterized in that the remote control device (I) comprises encryption means (MC) of the message before or after the operation of permutation, according to a predetermined encryption key (CL), and the receiving device (II) comprises decryption means (MDC) as a function of said encryption key (CL). 4. Agencement selon la revendication 3, caractérisé en ce que la clé de cryptage (CL) est variable mais est transmise avec le message du code de commande.4. Arrangement according to claim 3, characterized in that the encryption key (CL) is variable but is transmitted with the message of the command code. 5. Agencement selon l'une des revendications précédentes, caractérisé en ce que l'appareil de télécommande (I) comporte des moyens de codage adaptés pour coder le message destiné à être émis, binairement de façon que chaque changement de niveau du signal de message représente un passage d'un état logique à l'autre, les deux états logiques se distinguant par la durée de temps (△t1, △2) entre deux changements de niveau successifs.5. Arrangement according to one of the preceding claims, characterized in that the remote control device (I) comprises coding means suitable for coding the message intended to be transmitted, binarily so that each change in level of the message signal represents a passage from one logical state to another, the two logical states being distinguished by the duration of time (△ t1, △ 2) between two successive level changes. 6. Agencement selon la revendication 5, caractérisé en ce que le dispositif récepteur (II) comporte des moyens anti-rebond adaptés pour ne pas prendre en compte des changements de niveau d'une faible durée par rapport aux durées (△t1, △t2) des deux états logiques.6. Arrangement according to claim 5, characterized in that the receiving device (II) comprises anti-rebound means adapted to not take into account level changes of a short duration with respect to the durations (△ t1, △ t2 ) of the two logical states.
EP92204018A 1991-12-19 1992-12-18 Arrangement for remote control of actuating means Withdrawn EP0547725A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9115817 1991-12-19
FR9115817A FR2685506B1 (en) 1991-12-19 1991-12-19 REMOTE CONTROL ARRANGEMENT OF AN ACTUATOR USING A REMOTE CONTROL APPARATUS.

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EP0547725A1 true EP0547725A1 (en) 1993-06-23

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
EP0711050A1 (en) 1994-11-04 1996-05-08 Valeo Electronique Remote control system using encryption, particularly for motor vehicles
WO1996033328A2 (en) * 1995-04-20 1996-10-24 Directed Electronics, Inc. Advanced embedded code hopping system
FR2738938A1 (en) * 1995-09-20 1997-03-21 Philips Electronics Nv DEVICE FOR REMOTE CONTROL OF VIDEO RECEIVER
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US5872519A (en) * 1992-05-22 1999-02-16 Directed Electronics, Inc. Advanced embedded code hopping system
US5914667A (en) * 1992-05-22 1999-06-22 Issa; Darrell E. Advanced embedded code hopping system having master fixed code encryption
US5952933A (en) * 1992-05-22 1999-09-14 Issa; Darrell E. System having advanced embedded code hopping encryption and learn mode therefor
EP0711050A1 (en) 1994-11-04 1996-05-08 Valeo Electronique Remote control system using encryption, particularly for motor vehicles
FR2726712A1 (en) * 1994-11-04 1996-05-10 Valeo Electronique REMOTE CONTROL SYSTEM USING ENCRYPTION, IN PARTICULAR FOR A MOTOR VEHICLE
EP0716553A3 (en) * 1994-12-05 1999-08-25 Motorola, Inc. Pager for wireless control and method therefor
WO1996033328A2 (en) * 1995-04-20 1996-10-24 Directed Electronics, Inc. Advanced embedded code hopping system
WO1996033328A3 (en) * 1995-04-20 1996-11-21 Directed Electronics Inc Advanced embedded code hopping system
FR2738938A1 (en) * 1995-09-20 1997-03-21 Philips Electronics Nv DEVICE FOR REMOTE CONTROL OF VIDEO RECEIVER
EP0765032A1 (en) * 1995-09-20 1997-03-26 Philips Electronique Grand Public Remote control device for a video signal receiver

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