Matra

About: Matra is a based out in . It is known for research contribution in the topics: Signal & Detector. The organization has 1330 authors who have published 1216 publications receiving 17967 citations.

Design of a radiation tolerant library on micronic CMOS technology

Abstract: The construction of a radiation tolerant library can be reached by improving technology and by optimizing the design of less tolerant cells against total dose, transient effects due to heavy ions or gamma radiation. A first step consists in characterizing basic operators of the library by simulating noise margin, propagation delays and current consumption. Correlations between simulations and measurement are realized on irradiated test vehicles. In a second step, sensitive cells are modified to guarantee the desired immunity. This methodology, first applied on 2 mu m CMOS technology, is now used on MHS 1 mu m technology for ASIC design methodologies: gate-arrays and silicon compilation. This paper describes the work in designing and modeling which leads to the availability of two specialized offerings: a gate-array family with gate counts from 2000 to 50000 gates (MHS MC-RT family) and the silicon compiler tool GENESIL from MENTOR company. >

Medium-scale surface temperature mission: MUST

Abstract: The medium scale surface temperature (MUST) mission, studied in the frame of a European Commission (DG XII) contract, is a large swath (1200 Km), medium resolution (250 m) thermal infra-red imager mission devoted to retrieve the land surface temperature in order to serve various applications. These applications are firstly those concerned with the soil and vegetation water status (agriculture, irrigation and water resources management) as evapotranspiration and soil moisture can be inferred from surface temperature through relevant models. The other applications are either directly using the surface temperature (some frosts conditions assessment) or the air temperature that is itself derived from surface temperature extrapolation (urban heat island, some air frosts conditions). The project basically aimed to demonstrate the relevance and efficiency of the MUST mission products in the relevant application fields and to assess the economical benefits of the mission. Also in the course of the study the design of a medium resolution, large swath thermal imager, providing the appropriate performance required by the users while compact and affordable, was produced. Finally the operational implementation of the system and especially the ground segment was considered.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Speaker-independent French digits recognition using word-based vector quantization and hidden Markov models

Abstract: Vector Quantization has recently been used in the realization of a speaker-independent digit recognizer, based uniquely on the spectral content of the speech signal. On the other hand, the Hidden Markov Models proved their ability in modelling temporal distortions between different utterances of a word pronounced by several speakers. In term of recognition rate, HMMs are as efficient as the conventional DTW matching, but they need less computation and memory. This paper presents a speaker-independent digit recognition system that combines word-based VQ with HMM, the cost of which is low enough to be implemented on a single signal processor available today. It is the first result of a cooperation project between ENST and the MATRA company, financially supported by the French government. The proposed recognizer is structured in two parts. First, a VQ-preprocessor, with one vector codebook per vocabulary word, performs a coding of the short-time spectrum of the speech signal and realizes an initial sorting. Then HMMs are used to take the final recognition decision.

Bike with belt transmission and its frame

Abstract: Bike comprising a first frame element extending from one end carrying a front wheel housing to a lower end, a second frame element extending to a lower end rigidly fixed to the first lower end, a rear fork comprising a chainstay extending from the first element to a spindle support and a seat stay extending from the spindle support to the second element, a crankset having a lateral chainring, a rear wheel driven by a sprocket inside the fork, a belt engaged with the chainring and the sprocket. The chainstay has a major portion arranged below a straight line passing through the lower ends of the chainring and of the sprocket. The belt extends through the triangle formed by the second frame element, the chainstay and the seat stay, which form an irremovable assembly.