Abstract: An anti-piracy recording disk. The disk includes a main recording track which has interruptions or changes of turn. This gives rise to non-sequential reading and therefore to information which is difficult to access. The copying of such a disk by conventional means is very difficult making it possible to easily detect counterfeits or to render any copy unusable.

Abstract: A voltage-controlled oscillator including a dielectric resonator having a ferroelectric ceramic material placed between two metallized surfaces and biased by an electric field created by a difference in potential applied between the two surfaces as a function of a tuning frequency of the oscillator. Also included is a load impedance, and an active amplifier element coupled between the dielectric resonator and the load impedance. Further, the ceramic material is formed by metal oxides of the family: Bax;Sr(1-x) Ti(1-y)(A)y O3 (1) in which: A is a constituent configured to reduce dielectric losses of the material, and −0.4≲×≲0.9−0.001≲y≲0.2.

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 mounting and control system for a sensor module of a driver viewer enhancement system located external of a vehicle. The mounting and control system including a tube for supporting the sensor module and that is interconnected to a sleeve bearing by a ball and socket joint that provides for the limited pivotal adjustment of the module about a horizontal axis. The sleeve bearing is support by a mounting block, which provides for rotational adjustment of the sensor module about a vertical axis. The sleeve bearing has an inner hollow region having rectangular and trapezoidal cross-sectional configurations that extend within two vertical perpendicular planes. The tube is free to pivot within the sleeve bearing in the plane including the trapezoidal cross-section only, thereby providing for elevational adjustment of the sensor module.

Abstract: The surface mounting of a backset microwave package on a printed circuit. After the package has been accurately positioned against the printed circuit the connections are produced by soldering the conducting elements in direct contact. A chip is enclosed in a sort of cage constituting a screen which replaces a conventional cover, the cage is formed by layouts borne respectively by the package and the printed circuit and is linked together by metal links. The surface mounting is particularly applicable to packages operating in millimetric microwaves.

Abstract: A thermal capacitor component which includes, on a substrate, a stack of different layers defined in the form of a mesa terminating at its upper part in an electrical contact layer, which layer is coated with an electrically and thermally conducting layer surmounted by a heat sink element in contact with the conducting layer. The heat sink element has a plane shape. In addition, the component has at least one pad including another stack of layers which is also coated with an electrically and thermally conducting layer. The heat sink element is also in contact with the conducting layer of this stack so as to conduct the heat from the heat sink element into the substrate. Such a thermal capacitor may find application in the cooling of semiconductor components.

Abstract: The invention relates to a surface wave device linked to a base by a conductive material which is anisotropic in a direction perpendicular to the plane of the surface wave device and of the base. This anisotropic conductive material provides for the mechanical efficacy and the encapsulation of the surface wave device. It is deposited locally in the plane of the base, in such a way as to provide for the presence of a cavity in which the surface acoustic waves can propagate.

Abstract: Optical adapter for adapting cine-camera objective to video camera, which includes spectral splitter of light into three spectral bands, and three receivers each associated with one spectral band, the three receivers having the same format, the distance between the entrance of spectral splitter and the sensitive surfaces of the receivers being different for three spectral bands. The objective is a single-image focal plane objective for all three spectral bands and has a second given format. The adapter includes first optical device conveying image between the image focal plane of the objective and the sensitive surfaces of the receivers, and second optical device achieving a relative axial offset of the three spectral bands so that the differences in distance are compensated for. The first and second optical devices have overall magnification changing the format of the image of the objective into the receiver common format.

Abstract: The invention relates to a process for translating an ATM cell header for the routing thereof on a transmission highway of a communication network via an ATM switch. The header of the cell includes a first field VPI and a second field VCI, the first field VPI identifying a virtual path number and the second field VCI selecting a specified virtual channel within the virtual path. The process includes in] storing indirect addressing context page numbers in a first major table (3), storing context page numbers for the circuits in VP switching mode in a second major table (4), storing context page numbers (7) for the circuits in VC switching mode in indirect addressing (5) context pages (2), addressing the context pages (7) of circuits in VC switching mode by way of an indirect addressing (5) context page on the basis of the first major table (3) and of the field VCI, and addressing the context pages (9) of the VP switching mode on the basis of context page numbers contained in the second major table (4).

Abstract: A device to analyze or reconstruct one or more signals Ij coming from one or more light sources, comprises: means to separate the signals Ij into at least two signals Ij1 and Ij2, at least two channels V1, V2 respectively possessing a gain G1, G2 and a dynamic range D1, D2, said channels having at least one sensor and being adapted to obtain, at output, a signal I′j1, I′j2 with amplitudes Aj1(t), Aj2(t), a device for the processing of the signals I′j1, I′j2 adapted to memorizing the amplitude Aj1(t), Aj2(t) of at least one of the two signals I′j1, I′j2 when I′j1 and/or I′j2 is below a threshold value Smax and to determining the amplitude Aj(t) of the corresponding signal I′j. Streak camera with wide range of amplitude.

Abstract: A mechanical structure (100) comprises a moving mass (3) suspended by beams (4, 5, 6, 7) from a fixed frame (2). The structure (100) comprises elongation means (23-26) mechanically connected to each of the beams (4, 5, 6, 7). The elongation means is designed such that the stiffness of the beams (4, 5, 6, 7) varies only little during movement of the moving mass. The structure is characterized in that the response of an elongation means is asymmetric when acting in tension and in compression. The structure is thus made insensitive to accelerations along a direction parallel to the suspension direction.

Abstract: The multiple fractional division frequency synthesizer includes a frequency generator, a voltage-controlled oscillator, a programmable variable N-divider, a phase comparator, an integration and filter circuit, a time window generator, a weighted current source, a phase accumulator, and a charge-pump circuit including plural transistors. The current source is connected to the charge-pump circuit to directly switch currents over to the emitter of one or more of the plural transistors of the charge-pump circuit.

Abstract: The invention relates to the in-service monitoring of the condition of a tire of a wheel of a vehicle. To this end it proposes a process and, in particular, a device comprising: a sensor (4) mounted on the wheel, coupling means (BVF2, BRF2) for transmitting to the vehicle indications derived from this sensor (4), and electrical energizing means (BVF1, BRF1). According to the invention, the sensor (4) is a miniature acceleration-sensitive sensor implanted in the tread of the tire or in the vicinity of the tread. The coupling means, mounted on the wheel, then transmit indications relating to the measurements made at the moment at which the tread is in contact with the ground.

Abstract: An uncooled thermal matrix detector having a given spectral sensitivity range and being formed from pixels which are thermally insulated from each other, each pixel including an absorbing element which is thermosensitive in the spectral sensitivity range. The thermal matrix detector also includes on its face, turned toward the incident radiation to be detected, of each thermosensitive absorbing element, a biperiodic grating of elementary blocks limiting the viewing angle of the detector, the pitch of the grating being less than the mean wavelength of the spectral sensitivity range. The thermal matrix detector can be applied to so-called BLIP uncooled thermal detectors.

Abstract: A device for ATM cell switching having failure tolerance. The device is divided into two types of equipment modules. The first type includes connecting modules while the second type includes two branching and managing modules, one operating in an active mode while the other operates in a passive mode. An accessing device is implanted in each connector. Devices to execute the ATM layer function are almost identically implanted in each connector and in each of the two branching and managing modules. A supervision bus connects both types of modules to ensure quick and automatic reconfiguration of the device in case of failure in one of its components. The supervising bus is of simple configuration and only serves to carry, under the control of the managing module, signals indicative of the master and slave managing means as well as a signal indicative of the active branching module.

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: The invention relates to a multielement acoustic probe comprising an acoustic support and an electrical circuit with conducting tracks connected to elementary piezoelectric transducers. In addition, the probe comprises a film of composite conducting material placed between the piezoelectric transducers and the conducting tracks. Conventionally, the piezoelectric transducers are subcut in order to obtain elements which are acoustically uncoupled and electrically coupled. The presence of the film of composite conducting material favours the dimensioning of the track with respect to the subelements and constitutes an intermediate element with respect to the differences in thermal expansion between the acoustic support and the piezoelectric transducers. Application: medical and underwater imaging.

Abstract: A thermal imager system for use in a vehicle utilizes an uncooled microbolometer detector array (19), optics (13) for conducting scene radiation to the array within a sensor module (12) which is separate from an image processing and display unit (39), to provide a small, direct view sensor module (12) that may be oriented for forward viewing. The sensor module (12) is mounted external to the vehicle and the image processing and display unit (39) is mounted internal to the vehicle, and the two are connected by a noise immune bidirectional digital communication path or harness (37). The optics (13) consist exclusively of refractive optical components (14, 16) providing a straight line radiation path from the scene to the array (19).

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 process for detecting upstream congestion within an ATM switch. The switch includes several junctions linked together by a cross-connector. In each input junction, the number of incoming cells bound for a same specified output port of a junction are counted. Results of the count supplied by the input junctions are transferred to the output port. Results of the counts in the output junction are aggregated and a congestion is declared in the output port if the aggregate number of cells is greater than a specified threshold value.