Abstract: A privacy protection method designed to prevent or authorize a communication between a reader and an RFID label situated in an efficiency zone. In the method a) there is permanent detection of possible variation of an ambient magnetic field in one or more frequency bands allocated to the RFID labels, and b) in the event of detection of an instantaneous variation of the local magnetic field and in the absence of inhibition, a parameter value of a magnetic circuit is modified so that the instantaneous value of the local magnetic field is modified.

Abstract: An antenna includes a central loop and four adjacent coplanar eccentric loops. The central loop creates a magnetic field that is essentially perpendicular to the antenna. The centres of gravity of the four eccentric loops are essentially located on the periphery of the central loop and the eccentric loops are supplied in such a way as to predominantly create a rotating field in a plane parallel to the plane of the antenna. The eccentric loops can be associated in pairs of non-adjacent loops in such a way as to generate electromagnetic fields of opposite phases in the respective pair. In this way, the two loops of a pair can be connected such that the same current flows through them in opposite trigonometric directions. A radiofrequency generator can supply first and second excitation signals alternately on two outputs, respectively to the central loop and to the eccentric loops.

Abstract: A method and apparatus of information exchange between an interrogator device and a plurality of transponder devices are disclosed. Each of the transponder devices is equipped with a different binary identification code and is located in the magnetic field of the interrogator device, consisting in modifying the duration of the signals and/or the waveform of the signals transmitted by each transponder device according to the ratio between the signal transmitted by the transponder device and the ambient electromagnetic noise.

Abstract: A privacy protection method designed to prevent or authorize a communication between a reader and an RFID label situated in an efficiency zone. In the method a) there is permanent detection of possible variation of an ambient magnetic field in one or more frequency bands allocated to the RFID labels, and b) in the event of detection of an instantaneous variation of the local magnetic field and in the absence of inhibition, a parameter value of a magnetic circuit is modified so that the instantaneous value of the local magnetic field is modified.

Abstract: A method for secured communication between a transmitter (10) and a receiver (1) in which a range of power levels transmitted by the transmitter (10) a range of frequencies inside which the transmission will occur, (10) are known or detectable by the receiver (1), the method including transmission by the receiver (1) of a power supply signal for the transmitter characterized in that the receiver (I) transmits for at least the whole duration of the transmission, a noise signal which buries the transmission signal, the receiver (1) subtracts from the received signal, the noise signal in order to obtain a useful signal. The invention also includes a receiving device operating according to the method.

Abstract: An antenna includes a central loop and four adjacent coplanar eccentric loops. The central loop creates a magnetic field that is essentially perpendicular to the antenna. The centres of gravity of the four eccentric loops are essentially located on the periphery of the central loop and the eccentric loops are supplied in such a way as to predominantly create a rotating field in a plane parallel to the plane of the antenna. The eccentric loops can be associated in pairs of non-adjacent loops in such a way as to generate electromagnetic fields of opposite phases in the respective pair. In this way, the two loops of a pair can be connected such that the same current flows through them in opposite trigonometric directions. A radiofrequency generator can supply first and second excitation signals alternately on two outputs, respectively to the central loop and to the eccentric loops.

Abstract: This invention relates to a cerebral electrostimulation device containing a commutation device (300) comprising at least one input and several outputs each connected to at least one biocompatible electrode or at least one active area (202) of a biocompatible electrode (200), the commutation device (300) being used to selectively connect at least one input to one or more outputs. This electrostimulation device may be used for methods of diagnostic or therapy for the treatment of some pathologies, for example such as epilepsy or Parkinson's disease.

Abstract: The microsystems communicate by electromagnetic transmission, preferably by radio frequency, with a control circuit. An initialization phase of the method of addressing successively comprises addressing, by the control circuit, of each microsystem by an identification code that is proper to the latter and storing, in a register of the microsystem, of a reduced addressing code supplied by the control circuit. A subsequent addressing phase comprises transmission to all the microsystems, by the control circuit, of reset signals and increment signals. Each microsystem monitors resetting of at least one counter upon receipt of a reset signal and incrementation of the content of the counter upon receipt of an increment signal. Each microsystem compares the contents of its counter and of its register so as to trigger execution of a pre-determined command when these contents are identical.

Abstract: This invention relates to a secure electronic device comprising: at least an electronic circuit (10) containing information to be protected, an energy source (11); at least one sensor (12, 13, 14) capable of measuring a determined physical magnitude and outputting a value representative of this magnitude, means (15, 16, 17) of comparing each value with at least one predefined threshold (ref1, ref2, ref3) outputting result signals, a device (20) for protection of information comprising means for triggering destruction of at least part of the circuit using pyrotechnic means (27), a decision-making logical device (21) capable of activating the protection device after seeing the result signals, firing means (31) capable of priming a local or global pyrotechnic micro-charge (30) using electrical energy permanently stored in the energy source.

Abstract: This method of identification between an interrogation system (1) such as an arch and labels (E) placed on objects to be identified and called upon to pass through the interrogation field (2) functions by the sending of control signals from the interrogator (1) to the labels (E) so that the latter transmit their codes. The known interrogation mode in which the codes are supplied bit by bit and the labels responding simultaneously are inhibited in turn so that only one is active and identified at any one time, is preceded by an identification test during which all the labels send their code at one go all at the same time, which allows immediate identification if only one label is present. When a label has been identified, the interrogator (1) isolates it in order to exchange particular information with it.

Abstract: This invention relates to a secure electronic device comprising:

Abstract: A method and device for reading a set of tags, each with an ID code, of N bits, wherein the identification of these codes is carried out successively, bit by bit, by scanning a binary search tree with ∑ i = 1 N ⁢   ⁢ 2 1 branches, each representing the value 0 or 1 of one of the N bits, each branch being connected to the branch of the complementary value 1 or 0 via a node and being read only one during a tag set read sequence.

Abstract: The invention relates to a method and system for reading a dynamic set of tags present in the electromagnetic field of a polling device, consisting in updating cyclically a list of tags present in the electromagnetic field and minimizing the time for checking the presence of tags already identified, by assigning to each of these tags a sequence number whose binary size is significantly smaller than that of the ID code and that allows to realize a “call” of the tags present by enumeration.

Abstract: The invention relates to a process for simultaneously reading a set of electronic tags, each comprising a distinct identification code with N bits located within the electromagnetic field of a query device, consisting of:

Abstract: This invention relates to a secure integrated electronic device comprising