Abstract: The disclosure relates to a compact optical device, intended for use in a night vision telescope, that includes an objective, a standard light intensifier that rotates the image through 180° between its entry and its exit, an eyepiece, and four optical deflections, one in the objective and three in the eyepiece. The eyepiece, producing a single intermediate image between its entry and its exit, includes a combiner whose deflection angle ? depends on its optical index n and the half-field ? of the device. The field width of the device is at least 40°. The invention is applicable notably to night vision binoculars for aircraft or helicopter pilots.

Abstract: A device for distributing information and its fault management process which improves the robustness of a network, such as in an aircraft, a boat, or a train. The device or process includes one or more splitters of which an upstream input output is linked to a first end of a chain including stations, at lower overdimensioning cost, and with dynamic management of a fault which renders it transparent or of very short duration. A second end of the chain is linked to a downstream input output of another splitter and a fault management procedure is implemented activating or otherwise one of the ends of a chain depending on the nature and the conditions of the fault. Preferably, addresses of the elements of the network can reflect its topology and facilitate the shunting of the addresses of the stations between splitters.

Abstract: Oxygen breathing masks with a sound pickup device. A microphone capsule of the sound pick-up device is positioned at the base of a mouth-piece whose aperture is placed just before the mask user's mouth. Such a mask may find particular application for aircraft pilots.

Abstract: The systematic, and possibly repeated, acquisition of several distinct quantities for exploitation by a user system by utilizing a multiplexer with staged architecture without all inputs hard-wired. Each multiplexer stage is addressed by an elementary counter chained with elementary counters for addressing lower stages. The multiplexer inputs are scanned by regularly incrementing the chain of counters. If no precaution is taken, all the multiplexer inputs are scanned without considering their possible absences. To remedy this drawback a first elementary counter addresses the first stage of adjustable counting capacity switches, the elementary counters can address intermediate stages of the switches with controllable shunting circuits, and a global counter is reconfigured, at the end of each counting cycle of the first elementary counter, by commands adjusting the first elementary counter capacity, and activating or inhibiting the shunting circuits.

Abstract: The invention relates to a process and a system for voice recognition in a noisy signal. In a preferred embodiment, the system (2) comprises modules for detecting speech (30) and for formulating a noise model (31), a module (40) for quantifying the energy level of the noise and for comparing with preestablished energy spans, a parameterization pathway (5) comprising an optional denoising module (51), with Wiener filter, a module (52) for calculating the spectral energy in Bark windows, a module (50, 530) for applying a configuration of shift values (531), by adding these values to the Bark coefficients, as a function of the quantification (40), so as to modify the parameterization, a module (54) for calculating vectors of parameters, and a block (6) for recognizing shapes, performing the voice recognition by comparison with vectors of parameters prerecorded during a learning phase.

Abstract: An electronic keyboard, in particular one to be used in a dark environment and which therefore requires illumination of the keys. The keyboard includes a rigid printed circuit on which are soldered switches which can be actuated indirectly by the finger of the user, each switch being surmounted by an at least partially transparent key and an illumination device designed to illuminate the key from the rear of the key. A flexible printed circuit, carrying supply conductors for light-emitting diodes, is interposed between the keys and the rigid printed circuit carrying the switches. The flexible printed circuit includes a rigid part between a key and the corresponding switch, and the light-emitting diode which is to illuminate each key from the rear is soldered on the rigid part of the flexible printed circuit, between the key and the switch. The key preferably includes a cavity in which the diode will be housed. A key bears on the switch by way of the rigid part without bearing on the diode.

Abstract: A process for the automatic searching by an aircraft for a communication address of a ground entity of an ATN network. In the process, each address is coded according to a hierarchical binary tree structure including several fields. A first field identifies the network and the subsequent fields identify entities of the network. The process determines in the aircraft the address of the communication center to be contacted from the identity of an ground router which it receives, by comparing the received address of the router with those of the addresses contained in a database of the aircraft, and retaining as an address that which has the largest number of characters in common with the address of the ground router, given the tree structure of the addresses. Such a process may find particular application to ATN communications.

Abstract: A system for acquisition of logic states including sensors operable in all-or-nothing mode, each sensor including a switch linked with a pulling resistor between ground and power-supply potential, an analog multiplexer including an output and inputs linking the switches and resistors, voltage representative of the potential linked to a specific input, an analog-digital converter linked to the output, a calculating logic unit which drives the multiplexer and converter, generates input addresses of the multiplexer periodically and sequentially, reads and stores digital values at an output of the converter for each address, determines a digital value of the voltage, determines for each address corresponding to a sensor, a position of the digital value for an address with respect to a threshold, relating to an address, the position representing logic state of each sensor, and an altering device for altering the threshold as a function of the digital value of the voltage.

Abstract: A device for inserting, extracting, and locking a module into, from, and in a rack. The device includes two arms which can pivot with respect to the module and which are articulated together by a common articulation, each of them including, on the one hand, at one end, an anchor for anchoring it into the rack and, on the other hand, a non-common articulation with the module. A device immobilizes one of the arms with respect to the other when the arms are anchored in the rack. Further, associated with at least one of the arms, an elastic device works in compression between the module and the arm when its end is anchored into the rack. Such a device may find particular application in electronics modules for avionics.

Abstract: An antivibration elastic suspension in which a chassis of an inertial measurement unit is placed inside a casing. The inertial measurement unit includes a gyro assembly that is fixed to the chassis by two support rings flexible in terms of torsion and rotation around a fixed axis of the chassis. At least one flexible annular diaphragm is coaxial with the fixed axis and the flexible annular diaphragm is fixed by an interior periphery to an exterior periphery of the chassis and by an exterior periphery to an interior wall of the casing. The flexible annular diaphragm respects a symmetry of revolution exhibited by the gyro assembly with respect to the fixed axis.

Abstract: A display device with a liquid crystal cell including a layer of twisted nematic liquid crystal placed between two polarizers and including, between the liquid crystal layer and each of the polarizers, a structure for compensating for cell contrast variations according to the observation angle which has an orientation in the plane of the cell. The pass directions of the polarizers are separated by an angle of 90+A degrees, in which A is not zero, and the orientations of the two compensation structures are separated by an angle of 90+B degrees, in which B is not zero. Such a structure may find particular application to a liquid crystal screen, especially for avionics.

Abstract: The present invention relates to a display device with a liquid-crystal cell comprising a twisted nematic liquid-crystal layer (40) placed between two crossed polarizers (46, 48) and comprising, between the liquid-crystal layer and at least one of the polarizers, a structure for compensating for the variations in contrast of the cell according to the angle of observation. This structure comprises at least two superposed negative uniaxial media such that the extraordinary optical axis of one medium (44, 42) is parallel to the normal to the cell and that of the other medium (43, 41) is inclined with respect to this normal on the one hand and with respect to the plane of the cell on the other. This compensating structure includes an additional layer (50, 49) of a positive uniaxial birefringent material.

Abstract: The present invention relates to back-up instruments for aiding the piloting of an aircraft, which instruments are intended to provide, with high security of operation, indications relating to the pressure altitude, the conventional speed and the attitude (angles of roll and of pitch) of the aircraft, this being for the purpose of serving both as reference for the control of the proper operation of the main systems of on-board and back-up instruments in the event of a fault with the main system or systems of on-board instruments. It relates more particularly to combined back-up instruments including an electronic portion endowing them with a degree of calculational power.

Abstract: A magneto-optical effect distance measuring device and measuring rig incorporating the device. The device can measure the distance separating two members which can be displaced one with respect to the other by the magneto-optical effect. A permanent magnet is fixed on one of the members and an electro-optical device is fixed on the other member. The electro-optical device includes a diode emitting an optical beam. Further, a Faraday-effect magneto-optical film is disposed, on the one hand, between a polarizer and an analyser and, on the other hand, in the magnetic field of the magnet when the two members are in proximity to one another, the optical beam passing through the assembly. A diode receives the optical beam retransmitted by the analyzer so as to transform the luminous intensity of the beam into an electrical signal whose amplitude depends on the distance separating the two members when they are in proximity to one another.

Abstract: Optical devices using thin optical films to adapt the characteristics of a light radiation. An optical device includes an optical structure and thin optical films interposed in the path of a light radiation that gets propagated towards the optical structure. The optical films are placed in an enclosed space having dimensions that are greater than the dimensions of the optical films so that the latter are maintained by a float mounting that allows each of them freedom of movement. The device prevents mechanical strains created by differential thermal expansion. Such optical devices may find particular application to liquid crystal display screens.

Abstract: A modular structure for carrying a printed circuit board, having to be connected to an electronic installation. The modular structure includes two cover plates opposite each other, contributing to defining a housing for at least one printed circuit board. The cover plates engage one another by sandwiching, via a first edge, a support for one or more connection blocks for the connection and, via a second edge, a support for a locking mechanism in order to hold the structure in a connected position. The support for the locking mechanism and for the connection blocks have ends which are separate before the assembly of the cover plate. Such a modular structure may find particular application to electronic installations of the integrated modular avionics type.

Abstract: An actuating motion detection device for a mechanically actuated gyrolaser including at least one fastening ring coaxial with an actuation axis of the gyrolaser. The fastening ring includes a hub held at a center of a rim by radial flexible strips distributed about the hub, and the radial flexible strips are configured to act as springs and to vibrate under an actuating motion. The motion detecting device includes torsion detectors having a pair of piezoelectric plates disposed at a radial position along one radial flexible strip. The piezoelectric plates have respective remanent magnetic fields aligned in opposite directions, and each piezoelectric plate has two electrodes positioned on opposite sides of the piezoelectric plate with one of the two electrodes contacting the radial flexible strip. The electrodes are connected to a common output.

Abstract: This device allows secure electrical supply of several electronic modules able to be brought together in the same electronic rack and having several levels of criticality. It includes an electrical supply line (13) attached on the one hand to at least one electrical energy distribution network (20) and on the other hand to the various electronic modules (M1, M2, . . . Mn) by way of breaker relays (I1, I2, . . . , In) and means for managing the load sheddings instigating the commands for opening and closing the breaker relays (I1, I2, . . . , In) as a function of the load shedding control signals received. The means for managing the load sheddings are composed of a network partitioning load shedding commands (21) attached to the controls of the breaker relays (I1, I2, . . , In) by way of diode-type switches (S1, S2, . . . , Sn) and of a system of straps (22, 220) guaranteeing them great ability of adaptation to the changes of configuration of the equipment of the rack.

Abstract: A method for generating a horizontal path for the avoidance of danger zones for an aircraft. The method models the contours of each danger zone by a succession of segments demarcated by points. The method determines two homing circles and two capture circles passing respectively through the initial point and final point which are tangential respectively to the initial route and to the final route and have respectively the initial and final turning radius. The method also determines tangents both to the homing circles or the capture circles and to the contour of each danger zone. Among these tangents, a pair of tangents to a homing circle and to a capture circle are selected, defining a path skeleton connecting a homing circle to a capture circle without meeting a danger zone. And, an automatically controllable evasion path that lies on the previously defined path skeleton is then determined.

Abstract: A device for connecting an array of electronic-card-carrying modular structures to an external installation with which a flow of signals can be established, and also providing communication between the various modular structures. The device includes, near the array of modular structures, a plate provided with openings, terminal connection blocks coming from the installation, which should each be inserted into the openings and coupled directly to a connection block carried by a modular structure of the array and, fastened to the plate, a circuit for distributing signals between various modular structures, which is protected from the ambient environment. Such a device may find particular application to aircraft.