Abstract: A method for the control of flows of digital information between a source and a destination linked by a network of intermediate switching entities consists in carrying out a control of flows without the participation of the intermediate switching entities in estimating a state of load of the intermediate switching entities and in estimating a state of congestion of the destination to control a number of cells that may be transmitted by the source to the destination. Application to the control of flows in an ATM switch.

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.

Abstract: A sigma-delta modulator having a propagation delay &Dgr;t between an input of an analog-to-digital converter and an output of the digital-to-analog converter. A subtractor is located in a direct chain between an amplification unit and the analog-to-direct converter. The output of the amplification unit is connected to a first direct input of the subtractor. An output of the subtractor is connected to the input of the analog-to-digital convertor. The modulator also includes a compensation filter located between the output of the subtractor and a second inverter input of the subtractor. When considering an impulse response of the modulator, at the output of the subtractor, to an impulse sent at the output of the subtractor, including a first part covering a first time interval 0; T with T≧&Dgr;t, and a second part covering a second time interval T; ∝, the compensation filter is designed to contribute to the first part and the amplification unit is designed to contribute only to the second part.

Abstract: The invention relates to a device for the linearization of a frequency modulation ramp comprising a voltage controlled oscillator associated with a phase locked-loop. The device comprises a digitally controlled oscillator of which only the most heavily weighted bit is used, and a digital phase comparator receiving, on the one hand, said most heavily weighted bit and, on the other hand, a signal supplied by the voltage controlled oscillator. Application to very high linearity and very high accuracy radio altimeters.

Abstract: To improve the resistance of a solder to strains, especial thermal strains, superelastic particles are incorporated into the solder in a proportion by volume of 10 to 30% approximately. So that this incorporation can be done, the particles are coated with a metal, for example copper, that is wettable by the solder.

Abstract: A polarization splitter which includes a splitting medium lying between two transparent elements of defined indices. The splitting medium includes a periodic structure of layers of materials of different indices and having a period which is small compared with the wavelength of an incident beam so as to form a uniaxial birefringent medium of optical axis perpendicular to the plane of the periodic structure. The two transparent elements are made of a material of index approximately equal to the ordinary index (no) of the periodic structure.

Abstract: Disclosed is a method to correct the drift in the phase shift (&Dgr;&PHgr;,&thgr;) between two signals (S1) and (S2), said signals being generated by a signal having a reference frequency Fe or a corresponding period &OHgr;, the drift in the phase shift resulting from a drift in frequency Fe or in period, according to a given relationship R((F,&OHgr;), (&thgr;, &Dgr;&PHgr;)).

Abstract: The invention relates to a device for aiding the analysis of signals by using symbols-based digital modulation. The device comprises a signal memory for storing a complex digital signal, representative in amplitude and phase of a captured signal, over a chosen duration, as well as processing means for searching for the properties relating to the carrier frequency of the complex signal and to its modulation. According to the invention, the processing means comprise projection means for calculating the components of the complex signal in a function basis, parametrized according to an estimated tempo of the modulation, as well as calculation means, operating on these components so as to determine an estimate relating to a property of the complex signal, from among its elementary pulse shape, the string of symbols of the complex signal and its carrier.

Abstract: In the field of programmable integrated circuits designed for applications of high-powered computation, a compact system of low complexity is proposed to implement a static schedule scheme for real-time resource management, capable of taking account of the completion of a task.

Abstract: A method of voice recognition in a noise-ridden acoustic signal comprises a phase of digitizing temporal frames of the noise-ridden acoustic signal, a phase of parametrization of speech-containing temporal frames, a shape-recognition phase in which the parameters are assessed with respect to references pre-recorded in a reference space, a phase of reiterative searching for noise models in the noise-ridden signal frames, a phase of searching for a transition between the new noise model and the old model and, when the noise transition has been detected, a phase of updating the reference space, the parametrization phase including a step of matching the parameters to the new noise model.

Abstract: An optical device for a system presenting collimated images using a spherical mirror. The optical device makes it possible to present the user with an image corrected of off-centring distortion of a second kind due to an off-axis spherical mirror. In order to do this the optical device includes a tubular mirror whose optical characteristics ensure a high-quality image and correction of the off-centering distortion. The tubular mirror has a surface generated by the translation of a plane curve (a circular arc) along another plane curve (also a circular arc). The optical device is especially applicable to helmet sights for an aircraft pilot.

Abstract: A drive system which makes it possible to drive a matrix of picture elements, each including a cathode made of a material with low electron affinity. Each of crossover-point circuits include a switching device associated with a cathode of a picture element and makes it possible, with the aid of memory circuits, to connect the cathode to a current source during a time necessary for the driving of all the rows of the matrix and to regulate the current conduction of the corresponding picture element. Such a drive system may find particular application to electron guns and display screens.

Abstract: The present invention relates to the management, on board an aircraft, of the aeronautical digital telecommunications networks ACARS and ATN. It covers a method for automatic choice of the transmission sub-network of the ACARS or ATN networks which is most appropriate for the exchange of digital messages with the ground, taking account of the capabilities of the equipment of the aircraft, of that existing on the ground in the area overflown, of the costs and of the reliabilities of the possible links, and of the preferences of the pilot, of his airline and of the control services.

Abstract: A motor-drive device for sensors around a spherical electromagnetic lens, for example a Luneberg type lens using in a system of transmission and/or reception, comprises, for each module, at least one piezoelectric motor rigidly connected to the module, the module moving in the vicinity of the surface of the lens by the reptation of the piezoelectric motor on this surface. The disclosed device can be applied especially to receivers and/or transmitters carrying out multiple-satellite tracking, for example in the field of communications by orbiting satellites.

Abstract: This method meets the constraints dictated by the instructed values of turning radius and by the instructed values of direction of approach in terms of route or course to be maintained at the obligatory points of passage. It includes, at the obligatory starting and arrival points of passage, in determining the turning paths that meet the instructed turning radius at these points. These turning paths are located, at each of the obligatory points of passage, on a pair of circles that are tangential to the points of passage, according to the instructed direction of approach valid at this point and oriented in this direction. Once these turning paths have been determined, a selection is made, from among them, according to simple rules, of an initial homing turning path and a final capture path that can be connected by a rectilinear linking path to go from the obligatory starting point of passage to the obligatory arrival point of passage while seeking the shortest possible distance of travel.

Abstract: A system for analyzing interference caused by neighboring cells in a cellular communication system. A multipath synchronization is performed on the learning sequences of the beacon frequencies in order to determine the number of base stations using the analysis frequency as a beacon frequency. The identifiers of the base stations which are transmitting the beacon frequencies on which a synchronization has been made are demodulated after spatial filtering. A multipath synchronization is performed on learning sequences of the traffic frequencies so as to determine the number of base stations using the analysis frequency as a traffic frequency.

Abstract: A filter with surface acoustic wave resonators using an equivalent electrical bridge structure to obtain a good form relationship, i.e., a relationship between the filter rejection band and its pass band. Bridge arms advantageously include the paralleling of several resonators, thereby not requiring additional electrical elements as in the background art which provides for the use of series-connected resonators. Particular implantation methods for preparing equivalent structures to paralleling several resonators are also disclosed.

Abstract: A device to conceal a radar fitted into an automobile comprises at least one system of conductive wires perpendicular to the polarization of the wave sent out by the radar and reproducing a given graphic representation The graphic representation may be the automobile manufacturer's logo. The disclosed device can be applied especially to radars positioned in from of vehicles, for example of the ACC type.

Abstract: A method of manufacturing a multiple-element acoustic probe including piezoelectric transducers and an array of interconnections connecting the transducers to an electronic signal processing and control device. The probe also includes a continuous ground electrode integrated between the transducers and the acoustic matching elements, facing the piezoelectric transducers, the acoustic matching elements being totally uncoupled from one another mechanically. This probe may be used in medical imaging or underwater imaging.

Abstract: This bi-functional optical detector comprises: