Institution
Matra
About: Matra is a based out in . It is known for research contribution in the topics: Signal & Combustion chamber. The organization has 1330 authors who have published 1216 publications receiving 17967 citations.
Topics: Signal, Combustion chamber, Linear prediction, Missile, Spacecraft
Papers published on a yearly basis
Papers
More filters
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TL;DR: In this paper, it was shown that under fairly general conditions, exact reconstruction schemes with synthesis filters different from the analysis filters give rise to two dual Riesz bases of compactly supported wavelets.
Abstract: Orthonormal bases of compactly supported wavelet bases correspond to subband coding schemes with exact reconstruction in which the analysis and synthesis filters coincide. We show here that under fairly general conditions, exact reconstruction schemes with synthesis filters different from the analysis filters give rise: to two dual Riesz bases of compactly supported wavelets. We give necessary and sufficient conditions for biorthogonality of the corresponding scaling functions, and we present a sufficient condition for the decay of their Fourier transforms. We study the regularity of these biorthogonal bases. We provide several families of examples, all symmetric (corresponding to “linear phase” filters). In particular we can construct symmetric biorthogonal wavelet bases with arbitrarily high preassigned regularity; we also show how to construct symmetric biorthogonal wavelet bases “close” to a (nonsymmetric) orthonormal basis.
2,854 citations
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TL;DR: In this paper, the use of prior information to reduce the uncertainties associated to the estimation of canopy biophysical variables in the radiative transfer model inversion process was investigated, and the results showed that the prior information significantly improves the accuracy of the estimation.
612 citations
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TL;DR: In this article, four one-dimensional radiative transfer models are compared in direct and inverse modes on synthetic reflectance spectra (10 wavelengths in the visible and near-infrared).
408 citations
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TL;DR: The implementation and development of a new Taylor?Galerkin finite-element scheme within an unstructured/hybrid, parallel solver for unsteady LES is described, which is third-order in space and time and has a low dissipative error.
395 citations
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01 Jun 1992TL;DR: The performance of an HMM-based recogniser rises from 56% (no compensation) to 98% after speech enhancement and the lower limit of applicability of the projection (low SNR values) can be loosened after combination with NSS.
Abstract: Achieving reliable performance for a speech recogniser is an important challenge, especially in the context of mobile telephony applications where the user can access telephone functions through voice The breakthrough of such a technology is appealing, since the driver can concentrate completely and safely on his task while composing and conversing in a “full” hands-free mode This paper addresses the problem of speaker-dependent discrete utterance recognition in noise Special reference is made to the mismatch effects due to the fact that training and testing are made in different environments A novel technique for noise compensation is proposed: nonlinear spectral subtraction (NSS) Robust variance estimates and robust pdf evaluations (projection) are also introduced and combined with NSS into the HMM framework We show that the lower limit of applicability of the projection (low SNR values) can be loosened after combination with NSS Experimental results are reported The performance of an HMM-based recogniser rises from 56% (no compensation) to 98% after speech enhancement More than 3300 utterances have been used to evaluate the systems (three databases, two European languages) This result is achieved by the use of robust training/recognition schemes and by preprocessing the noisy speech by NSS
383 citations
Authors
Showing all 1330 results
Name | H-index | Papers | Citations |
---|---|---|---|
Nicholas J. Higham | 63 | 269 | 18871 |
Anatole Lécuyer | 43 | 293 | 9346 |
Magnús T. Gudmundsson | 36 | 131 | 4351 |
Robert Cahill | 31 | 180 | 3425 |
Pier Luigi Temporelli | 31 | 149 | 5150 |
Eric Lecolinet | 29 | 139 | 3565 |
Laurent Heutte | 28 | 133 | 3944 |
Anthony J. Cox | 27 | 57 | 22062 |
Olivier Colin | 25 | 60 | 3978 |
Alain Carpentier | 22 | 85 | 2075 |
André Lieutier | 22 | 66 | 1734 |
Enikő Magyari | 22 | 51 | 1426 |
Marc Bouchez | 21 | 123 | 1456 |
Jonathan Breeze | 18 | 49 | 1358 |
Brendan M. Quine | 18 | 108 | 1190 |