Showing papers by "Matra published in 1988"

Critical area and critical levels calculation in IC yield modeling

Abstract: A method is described for calculating critical coefficients to be included in an IC yield model for each masking step The yield model is a function of the chip surface, the defect density, and a mathematical law The method relies on partitioning total mask area at each level into area subcomponents sensitive to a minimal defect size using a design rule checker program Defect density with respect to size has been experimentally determined, and the selected mathematical law corresponded to the data Yield per level Y/sub i/ was determined by applying the model to critical areas with their corresponding defect densities The calculation of alpha /sub i/ has been carried out using the equation Y/sub i/=1/(1+A/sub T/ lambda /sup alpha /i) where Y/sub i/ is the i-level yield, A/sub T/ the total chip area, and lambda the average value of defect density per level It has been found that the resultant alpha /sub i/ values are stable in a given environment whatever the technology, the average defect density value, and the design rules >

Automatic construction of curvilinear solids from wireframe views

Abstract: An algorithm is presented that finds all solids that fit with a set of two or three bidimensional drafting views, a problem that has many applications in CADCAM. The views are orthogonal projections of the wireframe, and hidden parts are not removed. The solids must be bounded by planar, cylindrical, conical or toroidal surfaces. Axes of cylindrical, conical or toroidal surfaces must be parallel to the directions of projections and must intersect in straight lines or circles. The algorithm first builds an intermediate three-dimensional wireframe, then a heuristic is used to find edges between tangent surfaces that are usually not drawn. Faces are then built from this wireframe and the algorithm sorts them to construct a solid.

Device for the continuous production of a liquid mixture of solids and liquids

Abstract: A device for the continuous production of a liquid mixture of solids and liquids has a rotation-symmetric space with approximately vertical rotation axis for the formation of a rotational flow. In order to obtain a simple, but reliably operating mixing device that furnishes a predictable mixing result, even if a very intense or considerably weaker stream is to be periodically present, it is proposed to design the rotation-symmetric space as an annular space (13) with an internal overflow edge (14) and to provide a funnel-shaped collecting basin (18) under the overflow edge (14) and to provide the discharge openings of the dosing devices (52, 53) for the substances to be mixed above the overflow edge (14). The liquid mixture is to selectively pass to a mixing vessel (28) or directly to a discharge pump (27) at the outlet of the collecting basin (18).

Photoelasticity determination of a deformation or stress field

Abstract: A method for photoelasticity examination of a stress or strain field comprises successive steps. A two dimensional image of a test-piece is formed which has isochromatic fringes in the form of an array of pixels and the grey level of each pixel is stored as a digital value. From the isoclinals, the orientation of the main stresses σI and σII is determined at each pixel and the angle of orientation is stored for obtaining each pixel; from the stored pixels, the law of variation of brightness is worked out along at least three lines parallel to an arbitrary direction chosen by the operator and passing completely through the test-piece; from a condition at the limits and by finite differences then integration, a value is determined representative of σI and σII at each point of the median line among the three lines and σI and σII are derived from the stored digital values and from the computed values of σI and σII. A device for carrying out the method includes a polarizer and an analyzer whose relative angle may be modified, an imaging system and a computer for carrying out the successive computation steps.

RPCELP: a high quality and low complexity scheme for narrow band coding of speech

Abstract: Code-excited linear prediction (CELP), a powerful technique for low-bit-rate speech coding, leads to a huge computational load. A related scheme that replaces the conventional stochastic excitation by an efficient regular pulse excitation is introduced. This method, called regular pulse CELP (RPCELP), takes advantage of the codebook structure together with a convenient perceptual criterion to achieve a very low complexity while maintaining high-quality output speech. The algorithm can be implemented easily in real-time and can provide good communication quality at 6 Kb/s, even over noisy transmission channels. Objective performance results are reported for several configurations. >

Assessment of charging behaviour of METEOSAT satellite in geosynchronous environment

Abstract: Operational anomalies on the first two European weather satellites METEOSAT have been attributed to spacecraft charging. An investigative program including NASCAP calculations and laboratory tests has been complemented. The respective influences of sun illumination and a seasonal effect on large insulated areas and floating metallization have been assessed. NASCAP results together with test data suggest a scenario for electrostatic discharge generation. Material design changes have been assessed through NASCAP simulation. >

The document management component of a multimedia data model

Abstract: We describe ESTRELLA a multimedia object oriented data model developed by MATRA. This model is based upon objects, classes (organized in a lattice) and functions (allow to dynamically implement operations on data and new data types). The valid states of the data base are described by a set of integrity constraints. We propose a document model capable to manage structured documents and to index them with a superimposed codes method. We present as well the associated data manipulation language with a navigational interface and content search operators

In‐orbit demonstration of optical IOL/ISL—the silex project

Abstract: The use of optical communications for the high-data-rate links of the future European Data Relay System (EDRS) is receiving much attention. To confirm the feasibility of such communications links, an experimental system (SILEX) consisting of three satellites (two in geostationary orbit and one in low earth orbit) is planned for 1992 or 1993 to demonstrate both inter-orbit link (IOL) and intersatellite link (ISL) capabilities. A detailed feasibility study was performed from January to July 1987 under a European Space Agency (ESA) contract with Matra (France) as prime contractor, ANT (West Germany), Telespazio and Selenia Spazio (Italy) as subcontractors, and contributions from Berlin (France) and Dornier (West Germany). The system is based on GaAlAs semiconductor technology (0.8 μm) with silicon avalanche photodiodes (APDs) as detectors and arrays of charge-coupled devices (CCDs) for both acquisition and tracking sensors. The design will allow wavelength division multiplexing (WDM) and high-data-rate transmission to be demonstrated. The expected data rates are 120 Mb/s duplex for ISL, 1 Mb/s on the IOL forward link (GEOLEO) and two to four simultaneous 60 or 120 Mb/s channels on the IOL return link (LEOGEO).

Method and device for taking a picture with a great depth of view

Abstract: The device comprises a lens (12) for forming an image on a detector (10) having an array of sensors. The lens consists of several sectors having different focal lengths but whose principal planes are at the same locations. The signals provided by the detector are applied to digital processing means intended to improve contrast.

Medium band speech coding for mobile radio communications

Abstract: The authors propose a low cost 6 kbps multipulse-excited linear prediction coder for 8 kbps transmissions on 12.5 kHz radio channels. The main purpose of this system is to give good intelligibility and good speaker recognition. Against transmission errors, the authors present a correcting strategy and an extrapolation method that hides lost speech frames. >

Non-uniformité de la distribution spatiale des états de surface dans le canal des transistors CMOS

Abstract: Nous avons montre que les densites moyennes d'etats d'interface obtenues par la technique de pompage de charge peuvent conduire a une surestimation du nombre reel de ces defauts en milieu de canal des transistors MOS, lorsque l'on suppose qu'ils sont uniformement distribues sur toute l'etendue de l'interface Si-SiO2. Les densites d'etats de surface peuvent etre plus elevees pres de la source et du drain, meme lorsque le transistor MOS n'a pas ete soumis a une contrainte de vieillissement. Nous suggerons que cette augmentation est due aux dommages inevitablement produits au cours de certaines etapes du procede d'elaboration des transistors et en particulier lors de la gravure plasma de l'electrode de grille. Les densites locales des etats de surface doivent alors necessairement etre prises en compte, lors des etudes de vieillissement sur de tels composants. Nous proposons une nouvelle methode de calcul permettant d'acceder, a partir des mesures en pompage de charge, a la densite d'etats d'interface a proximite de la source et du drain avant et apres injection de porteurs chauds.

Arrangement with an admixer for admixing chemicals to a liquid stream

Abstract: In an arrangement for admixing loose material to a pressurised liquid stream, equipped with an admixing device (50) in the form of a rotatable cellular wheel (5, 12, 13, 25, 33) provided with a drive motor, it is proposed, in order to achieve good admixing in the desired mixing ratio even if the magnitude of the liquid stream varies widely, to provide a flowmeter (53) in the line (52) bearing the liquid stream, the signal from the meter acting on a speed controller (56) which determines the speed of rotation of the drive motor (16). The cellular wheel (5, 12, 13, 25, 33) is connected to a rotation signal emitter (17) which is connected to a further input of the speed controller (56).

Method and apparatus for digital transmission of speech between mobile stations

Abstract: A method and a system for digital speech transmission by radio means make use of analysis by multi-pulse excited linear prediction. The system includes, at the transmission end, an MPLPC analysis unit (20) followed by a block encoding circuit (36) and by an interlacing circuit (38).

Addition device for feeding bulk material into a liquid stream

Abstract: For an addition device having a housing (1) for feeding pulverulent or granular bulk material from a storage hopper (7) into a water stream which flows through a housing duct (8), to achieve a uniform mixing with a presettable mixing ratio even with a varying water flow rate, it is proposed to transport the bulk material by motor-driven star wheel feeders (5) and to seal off the star feeder wheel chamber (13) from the feed space and the water space (8) with a metal-to-metal joint by a sleeve (3) formed in the manner of a water tap spigot.

Apparatus for producing continuously a fluid mixture of solids and liquids

Abstract: Eine Einrichtung zum kontinuierlichen Erzeugen einer flussigen Mischung von Fest- und Flussigstoffen hat zur Bildung einer Rotationsstromung einen rotationssymmetrischen Raum mit annahernd vertikaler Rotationsachse. Means for continuously producing a fluid mixture of solids and liquids to form a rotating flow has a rotationally symmetrical chamber with an approximately vertical axis of rotation. Um eine einfache aber zuverlassig arbeitende Mischeinrichtung zu schaffen, die ein vorherplanbares Mischergebnis liefert, auch wenn zeitweise ein sehr starker oder wesentlich schwacherer Strom vorliegen soll, wird vorgeschlagen, den rotationssymmetrischen Raum als Ringraum (13) mit einer innenseitigen Uberlaufkante (14) auszubilden und unterhalb der Uberlaufkante (14) ein trichterformiges Auffangbecken (18) vorzusehen, sowie oberhalb der Uberlaufkante (14) die Austragmundungen der Dosiereinrichtungen (52,53) der zu mischenden Stoffe vorzusehen. In order to provide a simple but reliable operating mixing device, which supplies a vorherplanbares mixing result, even when a very strong or substantially weaker current is temporarily present, the rotationally symmetrical space as an annular space (13) is proposed to form with an inside overflow edge (14) and below provide the overflow edge (14) to provide a funnel-shaped collecting tank (18), and above the overflow edge (14) Austragmundungen the metering devices (52,53) of the substances to be mixed. Die flussige Mischung soll am Ausgang des Auffangbeckens (18) wahlweise zu einem Mischbehalter (28) oder direkt zu einer Austragpumpe (27) gelangen. The liquid mixture is intended to pass at the output of the collecting basin (18) selectively to a mixing vessel (28) or directly to a discharge pump (27).

Closure articulated about two axes.

Abstract: not available for EP0286519Abstract of corresponding document: US4833826The closure device is suitable for use as a lateral door or a back door of a passenger vehicle It comprises a closure member movable between a closure position on a frame and a fully open position The linkage connecting the closure member to a body provided with the frame has first arms and second arms The first arms are pivotally mounted on the body for rotation about a horizontal axis and are pivotally mounted at their other end on a closure member about another axis parallel to the first axis The second arms each have an end mounted on the body for pivotal movement about a horizontal axis parallel to the other axis and another end pivotally mounted on the closure member for rotation about an axis parallel to the other axis The second arms are telescopic and have a retracted condition in which they have a first length and an expanded condition in which they have a second length greater than the first length The second arms are in retracted condition until the amount of pivotal movement of the second arm means from the closed condition of the closing device has exceeded a predetermined extent

Support device for the mechanism of a revolver

Abstract: A device for supporting the mechanism of a revolver in association with the frame of the revolver. The device is constituted by a mechanism carrier plate (1) which directly receives the various subassemblies (4, 13, 24, 30, 35) of the mechanism, and which is capable of being mounted directly, together with the subassemblies supported thereby, on the frame (2) of the revolver.

Firearm percussion device for firing cartridges of two different calibres

Abstract: The invention relates to a percussion device making it possible to adapt to two munitions of different calibres, of which one has central percussion and the other annular percussion. According to the invention, the device comprises: - a cylindrical seat (7) mounted rotatably in the body (1) of the firearm; - a striker (11) which can slide in a stepped recess of the cylindrical seat (7) and the axis (13) of which is parallel to the axis of rotation (9) of the cylindrical seat, but offset in relation to this; - a transverse stop pin (16) which is mounted in the cylindrical seat (7) and against which the striker (11) bears by means of a spring (17); - a locking member mounted transversely in the body and capable of locking the cylindrical seat (7) in either one of the two positions of the latter. The invention is used particularly for percussion devices on revolvers and pistols with an interchangeable barrel.

A Modular, Large Format, Two Dimensional Photon Counting Imaging System

Abstract: A 2D - photon counting imaging system, derived from the Mount Stromlo and Siding Spring Observatory concept, has been developed by MATRA for ground-based and spaceborne experiments This system is described and its main performances discussed The detector consists of a high gain image intensifier tube coupled to an array of 2D -CCD sensors by means of flexible optical fibre bundles (for image dissection) The dedicated electronic unit performs event detection and filtering, event centroid calculation and accumulation in a high speed incrementing memory Some specific and critical techniques (direct optical coupling between fiber bundles and CCDs, realtime centroid calculation,) and components (programmable array logic) are presented and discussed

Topographic Description Of Grey-Tone Images: Some Applications To Segmentation And Tracking.

Abstract: A grey-tone image can be viewed as a three-dimensional continuous surface with peaks, ridges, valleys, plains and oriented facets. In this paper, simple methods are described to analyze the structure of this three-dimensional surface. A small number of classes are defined to represent the structure of the image, and an algorithm is used to classify each pixel according to its local grey-tone structure. Then, region growing procedures are given to segment the image into semantically meaningful regions. The problem of establishing a relationship between a topographic class and the physical properties of the image is also addressed and an algorithm is proposed to extract image patches which correspond to three-dimensional continuous surfaces in the scene. Applications of these algorithms to several images are presented and discussed.

Elektrische impulsstromquelle und eine von dieser gebrauch machende elektromagnetische kanone

Abstract: A pulsed electric current source for feeding an electromagnetic gun with a primary current source and a field compression generator (14) with an electrically conducting field compression enclosure fed by the primary current source (10). The current required for field compression is generated by combustion or detonation of a solid state propergol or explosive mass. The current delivered by the primary source may be obtained by MHD (10). In a modification this current is also generated by detonation.

Infrared Sounder For Second Generation Meteosat

Abstract: This paper provides the main outcomes from studies dedicated to the Infrared Sounder for Second Generation Meteosat. These studies are performed by Matra Space Branch and supported by European Space Agency (ESA) and Centre National d'Etudes Spatiales (CNES). Various instrument concepts are compared and two prefered options are more fully described, which apply respectively to 3-axis stabilized and spinning platforms. Possible improvements or simplifications of the baselines are identified.

The future pan European mobile radiotelephone system: a short overview

Abstract: The main features of the GSM mobile radio system are presented. A special attention is devoted to channel coding and the key design issues of the transmission schemes are discussed.

Drum-type firearm and associated drum.

Abstract: not available for EP0251935Abstract of corresponding document: US4793084The invention relates to a cylinder firearm whose cylinder (100) includes a plurality of chambers (108). The cylinder (100) includes a channel (101) associated with each of its chambers (108) and opening out into said chamber ahead of any cartridge contained therein, with the other end of each channel receiving a piston (111), which piston presses against the frame of the gun when fired, thereby causing the cylinder to move forwardly by reaction and thus suppressing the operating clearance provided between the cylinder and the barrel and thus providing good sealing at the front of each chamber when fired. The invention is particularly applicable to revolvers.

Frame for revolver mechanism

Abstract: L'invention concerne un dispositif de support pour mecanisme de revolver, associe a la carcasse dudit revolver. The invention relates to a support device for revolver mechanism associated with the frame of said gun. Selon l'invention, ce dispositif est constitue par une platine porte-mecanisme (1) recevant directement les differents sous-ensembles (4, 13, 24, 30, 35) du mecanisme, et pouvant etre montee directement, avec les sous-ensembles qu'elle supporte, sur la carcasse (2) du revolver. According to the invention, this device is constituted by a carrier mechanism plate (1) directly receiving the various sub-assemblies (4, 13, 24, 30, 35) of the mechanism, and can be mounted directly with the subsets it supports, on the carcass (2) of the revolver. Application a la fabrications des revolvers. Application to the manufacture of guns.

Procede et dispositif de determination d'un champ de deformation par photoelasticimetrie

Abstract: LE PROCEDE PERMET DE DETERMINER LA REPARTITION D'UN CHAMP DE DEFORMATION OU DE CONTRAINTE DANS UNE PIECE ECHANTILLON SOUMISE A DES CHARGES. POUR CELA : ON REALISE UNE IMAGE DE PHOTOELASTICIMETRIE A DEUX DIMENSIONS DE L'EPROUVETTE, PRESENTANT DES FRANGES ISOCHROMES SOUS FORME D'UN RESEAU DE PIXELS ET ON MEMORISE LA BRILLANCE DE CHAQUE PIXEL SOUS FORME D'UNE VALEUR NUMERIQUE; ON DETERMINE, A PARTIR DES ISOCLINES, L'ORIENTATION DES CONTRAINTES PRINCIPALES S I ET S II EN CHAQUE PIXEL ET ON MEMORISE L'ANGLE D'ORIENTATION POUR OBTENIR CHAQUE PIXEL; ON ELABORE, A PARTIR DES PIXELS MEMORISES, LA LOI DE VARIATION DE BRILLANCE SUIVANT AU MOINS TROIS LIGNES PARALLELES A UNE DIRECTION ARBITRAIRE CHOISIE PAR L'OPERATEUR EN TRAVERS DE L'EPROUVETTE; ON DETERMINE, A PARTIR D'UNE CONDITION AUX LIMITES ET PAR DIFFERENCES FINIES PUIS INTEGRATION, UNE VALEUR REPRESENTATIVE DE S IS II EN CHAQUE POINT DE LA LIGNE MEDIANE PARMI LES TROIS LIGNES ET ON DEDUIT S I ET S II DES VALEURS NUMERIQUES MEMORISEES ET DES VALEURS CALCULEES DE S IS II.