Abstract: The invention concerns a method for calibrating a system for real-time measurement of the activity of a cognitive function of a test subject, the method comprising the successive steps of: acquiring electrical signals representative of a neural activity of a test subject; calculating values of markers of the cognitive function activity; generating a plurality of copies of calculated values of markers and adding noise to the generated copies; and, constructing a classifier by machine learning, based on the calculated marker values and noisy copies, the classifier being suitable for measuring the activity of the cognitive function of the test subject by calculating a probability that an electrical signal representative of the neural activity of the test subject results from a predetermined activity state of the cognitive function of the test subject.

Abstract: The invention concerns a method for calibrating a system for real-time measurement of the activity of a cognitive function of a test subject, the method comprising the successive steps of: acquiring electrical signals representative of a neural activity of a test subject; calculating values of markers of the cognitive function activity; generating a plurality of copies of calculated values of markers and adding noise to the generated copies; and, constructing a classifier by machine learning, based on the calculated marker values and noisy copies, the classifier being suitable for measuring the activity of the cognitive function of the test subject by calculating a probability that an electrical signal representative of the neural activity of the test subject results from a predetermined activity state of the cognitive function of the test subject.

Abstract: The system includes an active medical device with means for delivering defibrillation shocks; means for continuous collection of the patient current cardiac activity parameters; and evaluator means with neuronal analysis comprising a neural network with at least two layers. This neural network comprises upstream three neural sub-networks receiving the respective parameters divided into separate sub-groups corresponding to classes of arrhythmogenic factors; and downstream an output neuron coupled to the three sub-networks and capable of outputting an index of risk of ventricular arrhythmia. The risk index is compared with a given threshold, to enable or disable at least one function of the device in case of crossing of the threshold.

Abstract: The system includes an active medical device with means for delivering defibrillation shocks; means for continuous collection of the patient current cardiac activity parameters; and evaluator means with neuronal analysis comprising a neural network with at least two layers. This neural network comprises upstream three neural sub-networks receiving the respective parameters divided into separate sub-groups corresponding to classes of arrhythmogenic factors; and downstream an output neuron coupled to the three sub-networks and capable of outputting an index of risk of ventricular arrhythmia. The risk index is compared with a given threshold, to enable or disable at least one function of the device in case of crossing of the threshold.

Abstract: The invention provides a portable device for recognizing and/or reconstructing speech by ultrasound probing of the vocal apparatus, the device including at least one ultrasound transducer (20) for generating an ultrasound wave and for receiving a wave reflected by the user's vocal apparatus, and analysis means for analyzing a signal generated by the ultrasound transducer, wherein the device includes locating means (21, 23) for determining the position of the ultrasound transducer relative to the skull of the user.

Abstract: An active medical device able to discriminate between tachycardias of ventricular origin and of supra-ventricular origin. Two distinct temporal components (UnipV, BipV) are obtained corresponding to two EGM signals of ventricular electrograms. The diagnosis operates in at least two-dimensional space to determine, from the variations of one temporal component as a function of the other temporal component, a 2D characteristic representative of a heart beat and, this, for a reference beat collected in Sinus Rhythm (SR) in the absence of tachycardia episodes, and for a heart beat in Tachycardia. The discrimination of the tachycardia type, VT or SVT, is then realized by a classifier operating a comparison of the two current and reference 2D characteristics.

Abstract: The disclosure relates to a method for locating a mobile station inside an area covered by a wireless telephony cellular network in which the mobile station operates. The method includes using the mobile station to measure the received power on at least seven different communication channels of the network (step 200) and then locating the station according to the measurements and relevant predetermined information of the correspondence between received power on the channels and location within the covered area. The predetermined information can include power levels previously measured on the channels at different locations and stored in a database, in which case the station is located by comparing the measurements with the contents of the database. The method also enables greater locating accuracy, even inside buildings.

Abstract: An active medical device able to discriminate between tachycardias of ventricular origin and of supra-ventricular origin. Two distinct temporal components (UnipV, BipV) are obtained corresponding to two EGM signals of ventricular electrograms. The diagnosis operates in at least two-dimensional space to determine, from the variations of one temporal component as a function of the other temporal component, a 2D characteristic representative of a heart beat and, this, for a reference beat collected in Sinus Rhythm (SR) in the absence of tachycardia episodes, and for a heart beat in Tachycardia. The discrimination of the tachycardia type, VT or SVT, is then realized by a classifier operating a comparison of the two current and reference 2D characteristics.

Abstract: The device comprises, on the one hand, a cassette containing an electret between two electrodes and, on the other hand, a fixed reader adapted to receive the cassette in a pocket, to identify it, to measure the charge of its electret and to display data relating to this charge. This reader comprises also a head adapted to record the data on an area (or strip) of the cassette and there are provided readers independent of the aforesaid reader adapted to subsequently receive the cassette, to measure the charge of its electret, to read the data and, by difference between the measured value and that read, to display the radiation dose received by the cassette since its recording.

Abstract: The invention relates to a device for measuring irradiation capable of modifying the charge of an electret. It is arranged in a portable cassette, between two electrodes held separated by a part and connected to a measuring circuit. A conductive shutter is movable parallel to itself and to the electret between this electret and than electrode, so as to alternately mask this electret with respect to this electrode and to render the electret visible to the electrode. The measurement exploits differences in charge of the electret read according to the movements of the shutter.

Abstract: The device detects variations in magnetic flux so that the passage through a given threshold by the amplitude of such a variation per unit time is manifested by the movement of an element adapted to trigger an action.

Abstract: The device comprises means for applying a DC voltage U as a function of the voltage taken from the terminals of a fuse between a fixed electrode and a movable electrode forming together a capacitor. The movable electrode is urged towards the fixed electrode by an electret fast to the latter and in the opposite direction by a magnet and by the voltage U. As soon as this voltage exceeds a threshold corresponding to the rupture of the fuse, the movable electrode swings over and closes a switch for warning purposes.

Abstract: The device is able to detect the exceeding of a given threshold by a parameter, other than an electric voltage, capable of affecting the electrostatic force of attraction exerted between a charged electret and one, of two electrodes between which said electret is placed, said parameter being for instance an ionizing radiation. The two electrodes are at the same electric potential and the device also comprises return means for urging the first electrode and the electret permanently apart, and means for using the relative displacement of said elements, when it occurs, for desired detection purposes.

Abstract: A control device comprising three mechanical elements, one of which is moe relatively to the two others and one of these elements being an electret, whereas the two others are control electrodes. The mechanical mobile element forms a portion partially cut out of a plate 3. Applications to electrical (particularly telephone exchanges and optical information display) switching.

Abstract: The invention concerns a switching device using electrets. It comprises at least two electrodes and at least two electrets; control signals are applied between electrodes to cause a mobile element carrying an electret to pass from one rest position to the other.Application to electrical, pneumatic and optical switching.

Abstract: A leaf of suitable dielectrical material bears, trapped on one at least of its two surfaces, equal or substantially equal amounts of positive and negative electrostatic charges, these charges being preferably injected into the leaf by successive ionization in reverse directions of gaseous layers against said surface. The device is valuable in piezoelectric or pyroelectric devices such as ultrasonic transducers, pressure or vibration detectors, microphones, heat or infrared radiation detectors.

Abstract: The invention relates to devices of the relay type, but using an electrostatic force, rather than a magnetic force, for moving the mobile element. A device according to the invention allows to produce a modification in one or several controlled circuits under the control of a modification or order in an actuating or controlled circuit.The device essentially includes two control electrodes, between which a potential difference may be applied (when desired) using an electrical power source and a control switch, and an electret constituted by an insulating element carrying electrical charges of opposite signs (negative and positive charges), the electret or the algebraic sum of which is different from zero; one of the electrodes is mobile and can occupy at least two positions.The device may be applied to realize electrical, pneumatic, hydraulic or optical switchings.

Abstract: A device for measuring quantities of electric charges, or other electric parameters whose magnitudes can be obtained from measurements of quantities of electric charges. The device includes a capacitor having a measuring plate and another plate or an intermediate element. The electrical parameter is applied to the capacitor so that a charge representative of its magnitude is induced on the measuring plate. This induced charge is modulated at a frequency f.sub.o and at a frequency f.sub.1, the frequency f.sub.1 being less than f.sub.o /2. An electrical signal representative of the modulation of the induced charge is generated. This signal has a first component of frequency f.sub.o whose magnitude represents the quantity of the induced charge and a second component of frequency f.sub.1 whose magnitude varies according to the distance between the measuring plate and the location at which the electrical parameter is applied to the capacitor.

Abstract: The device measures electrical charges, an electrical voltage or an electrical current, present between two electrodes of which one is fixed and of which the other is mounted so as to be able to vibrate mechanically. One of the two electrodes is connected to ground. Energizing means apply an AC voltage V.sub.o of frequency f.sub.o between the two electrodes. Means are provided for detecting the amplitude of the mechanical vibrations of frequency f.sub.o of the vibrating electrode and means for measuring this amplitude, which is a function of the parameter to be measured. The means for detecting and measuring the amplitude of the mechanical vibrations is a piezo-electric element subject to these vibrations and an apparatus adapted to measure the AC voltage produced.