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Dissertations / Theses on the topic 'Impulsive signal'

Author: Grafiati

Published: 1 April 2023

Last updated: 25 July 2025

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1

Brown, Christopher L. "Goodness-of-fit and detection problems in impulsive interference." Thesis, Curtin University, 2000. http://hdl.handle.net/20.500.11937/40.

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After defining the structure to a signal detection scheme, this dissertation describes and addresses some of the unresolved issues associated with its use when the interference encountered is impulsive. The alpha-stable (alpha-S) family of distributions is used as a model of this interference due to its physical interpretation and its general form. Despite its attractive features, difficulties arise in using this distribution due to, amongst other things, the lack of a general closed form expression for its probability density function. Relevant to the detection scheme used, this affects param

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2

Kannan, Balakrishnan. "Spatial signal processing for beamforming in impulsive noise using Bayesian principles." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621044.

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3

Brown, Christopher L. "Goodness-of-fit and detection problems in impulsive interference." Curtin University of Technology, School of Electrical and Computer Engineering, 2000. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=9750.

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After defining the structure to a signal detection scheme, this dissertation describes and addresses some of the unresolved issues associated with its use when the interference encountered is impulsive. The alpha-stable (alpha-S) family of distributions is used as a model of this interference due to its physical interpretation and its general form. Despite its attractive features, difficulties arise in using this distribution due to, amongst other things, the lack of a general closed form expression for its probability density function. Relevant to the detection scheme used, this affects param

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4

Zou, Yuexian. "Robust statistics based adaptive filtering algorithms for impulsive noise suppression." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22823736.

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5

cui, qiaofeng. "Suppression of impulsive noise in wireless communication." Thesis, Högskolan i Gävle, Avdelningen för elektronik, matematik och naturvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-18270.

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This report intends to verify the possibility that the FastICA algorithm could be applied to the GPS system to eliminate the impulsive noise from the receiver end. As the impulsive noise is so unpredictable in its pattern and of great energy level to swallow the signal we need, traditional signal selection methods exhibit no much use in dealing with this problem. Blind Source Separation seems to be a good way to solve this, but most of the other BSS algorithms beside FastICA showed more or less degrees of dependency on the pattern of the noise. In this thesis, the basic mathematic modelling of

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6

DeJarnette, Hunter Archer. "Measuring Noise in the VHF Band and Its Effect on Low SNR Signal Detection." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/35293.

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With the increasing demand for access to the crowded radio frequency spectrum, cognitive radios have been suggested as one solution. Cognitive radios would be frequency agile and able to sense their radio environment and opportunistically use empty spectrum. Spectrum sensing, monitoring a given band of spectrum to see if it is occupied, is an essential part of a cognitive radio. The preferred method of spectrum sensing is the energy detector, which does not require any a priori information about the signal to be detected and is computationally simple to implement. Man-made noise, impulsive in

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7

Wen, Yu, and 文宇. "Robust statistics based subspace tracking in impulsive noise environment: algorithms and applications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B44570181.

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Zou, Yuexian, and 鄒月嫻. "Robust statistics based adaptive filtering algorithms for impulsive noise suppression." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B22823736.

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(Uncorrected OCR) Abstract Abstract of thesis entitled Robust Statistics Based Adaptive Filtering Algorithms For Impulsive Noise Suppression Submitted by Yuexian Zou for the degree of Doctor of Philosophy at The University of Hong Kong in May 2000 The behavior of an adaptive filter is inherently decided by how its estimation error and the cost function are formulated under certain assumption of the involving signal statistics. This dissertation is concerned with the development of robust adaptive filtering in an impulsive noise environment based on the linear transversal filter (L

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9

Brcic, Ramon. "Some aspects of signal processing in heavy tailed noise." Thesis, Curtin University, 2002. http://hdl.handle.net/20.500.11937/323.

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This thesis addresses some problems that arise in signal processing when the noise is impulsive and follows a heavy tailed distribution. After reviewing several of the more well known heavy- tailed distributions the common problem of which of these hest models the observations is considered. To this end, a test is proposed for the symmetric alpha stable distribution. The test threshold is found using both asymptotic theory and parametric bootstrap resampling. In doing so, some modifications are proposed for Koutrouvelis' estimator of the symmetric alpha stable distributions parameters that imp

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10

Brcic, Ramon Francis. "Some aspects of signal processing in heavy tailed noise." Curtin University of Technology, Australian Telecommunications Research Institute, 2002. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=14244.

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This thesis addresses some problems that arise in signal processing when the noise is impulsive and follows a heavy tailed distribution. After reviewing several of the more well known heavy- tailed distributions the common problem of which of these hest models the observations is considered. To this end, a test is proposed for the symmetric alpha stable distribution. The test threshold is found using both asymptotic theory and parametric bootstrap resampling. In doing so, some modifications are proposed for Koutrouvelis' estimator of the symmetric alpha stable distributions parameters that imp

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11

Lau, Wing-yi. "New recursive parameter estimation algorithms in impulsive noise environment with application to frequency estimation and system identification." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37595866.

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12

Lau, Wing-yi, and 劉穎兒. "New recursive parameter estimation algorithms in impulsive noise environment with application to frequency estimation and systemidentification." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37595866.

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13

ERTUNCAY, DENIZ. "Temporal and spatial analysis of near fault stations in terms of impulsive behavior." Doctoral thesis, Università degli Studi di Trieste, 2020. http://hdl.handle.net/11368/2961198.

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Increasing number of seismic stations located in close proximity to active faults allows analysis of seismic signals that are recorded in near fault regions. Unique seismic signals, called “impulsive” or “pulse shaped” signals, are captured in velocity waveforms in numerous large magnitude earthquakes. In such waveforms, the earthquake is recorded as a one or several long period high amplitude signals. Long period signals are important in engineering seismology due to their large loads on structures. Ground motion prediction equations and design codes fail to capture the amplitudes in long per

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14

Hrabina, Martin. "Akustická detekce výstřelů ve volné přírodě." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221340.

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This work is concerned with gunshot detection and recognition. Contains overview of published works and methods used in this field. Furthermore, it lists several commercial gunshot detectors. Binary gunshot detection and recognition algorithm is proposed which discriminates between gunshot and non-gunshot sounds occuring in nature. Algorithm is tested in Matlab. Proposed algorithm is implemented in TMS320C6713 digital signal processor, achieved results are compared.

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15

Riffi, Temsamani Mohamed Saïd. "Analyse statistique des bruits impulsifs et estimation d'un signal en présence de bruit impulsif." Nancy 1, 1993. http://www.theses.fr/1993NAN10023.

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Généralement, dans le domaine du traitement du signal, il existe deux types de bruits: le bruit blanc gaussien et le bruit de type impulsif. Actuellement, le premier peut être éliminé facilement, puisque son comportement statistique et spectral est bien connu. Par contre, le bruit impulsif présente souvent des caractéristiques non-stationnaires telles que l'apparition d'impulsion aléatoire dans le temps. L'objectif est de connaitre le comportement de ce bruit en vue d'une modélisation permettant l'accès au filtrage et la détection de l'information. Deux parties constituent ce mémoire: - étude

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16

Yeung, W. K. "Microwave imaging with impulsive signals." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382334.

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17

Wang, Xun [Verfasser]. "Model based signal enhancement for impulse response measurement / Xun Wang." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/1051500605/34.

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18

Linarès, Georges. "Détection de ruptures et classification automatique dans un environnement de bruits impulsifs." Avignon, 1998. http://www.theses.fr/1998AVIG0118.

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Ce memoire est consacre au probleme de la supervision d'environnements reels de bruits impulsifs. L'objectif est de developper une methode capable de detecter, dans un flux continu de bruits transitoires, les evenements acoustiques qui ne s'inscrivent pas dans une certaine regularite du signal. Nous montrons que les techniques classiques de detection de ruptures sont mal adaptees a la surveillance d'un milieu intrinsequement irregulier. Ceci nous amene a adopter une approche de plus haut niveau, basee sur le regroupement en classes des differentes composantes acoustiques de l'environnement. L'

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19

Aramaki, Mitsuko. "Analyse-synthèse de sons impulsifs : approches physique et perceptive." Aix-Marseille 2, 2003. http://www.theses.fr/2003AIX22047.

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20

Li, Liwei. "Microwave Photonic Signal Processing Techniques based on Finite Impulse Response Configurations." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/9477.

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Microwave photonic signal processing based on optical delay line structure is a powerful technique for processing high speed signals. Finite impulse response microwave photonic filters are of particular interest because of their inherent flexibility in realizing arbitrary transfer functions and linear phase, together with coherent interference free and phase-induced intensity noise free. This thesis proposes a number of effective solutions to eliminate the undesirable degradation of RF response so that microwave photonic filters can be used in practice. Experimental results demonstrate succes

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21

Campbell, Roy Lee. "Performance assessment of the finite impulse response Adaptive Line Enhancer." Diss., Mississippi State : Mississippi State University, 2002. http://library.msstate.edu/etd/show.asp?etd=etd-05222002-085151.

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22

Chu, Xiaoli. "Ultra-wideband direct-sequence impulse radio wireless communications /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202005%20CHU.

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23

N'Da, Patrick Amoikon. "Impact du bruit impulsif sur les transmissions SDSl." Rennes, INSA, 2005. http://www.theses.fr/2005ISAR0024.

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Les bruits impulsifs présentent un effet très préjudiciable sur les transmissions SDSL. En particulier lorsque des applications du type temps réel sont transportées. Toutefois, la modification de la structure des systèmes SDSL permet au prix d'un léger délai de répondre à la problématique des bruits impulsifs sur le SDSL. Dans la première partie de cette thèse, les détails de la constitution des systèmes SDSL ont été donnés. Le chapitre deux met en évidence l'impact des bruits impulsifs sur les transmissions SDSL. Il présente en partie des résultats de validation du simulateur SDSL implémenté

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24

Galindo, Romero Marta. "Spatial Variations in the Acoustic Peak Pressure of Impulsive Low Frequency Anthropogenic Signals in Underwater Marine Environments." Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/59661.

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A method to predict spatial variations in the peak pressure level of impulsive low frequency anthropogenic signal propagating in marine environments is presented. The method is based on the correlation between the peak pressure level and the sound exposure level, and the application of extreme value theory to estimate fluctuations of the peak pressure around its mean value in varying ocean environments. The method was examined using signals from offshore seismic surveys and pile driving.

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25

Kahaei, Mohammad Hossein. "Performance analysis of adaptive lattice filters for FM signals and alpha-stable processes." Thesis, Queensland University of Technology, 1998. https://eprints.qut.edu.au/36044/7/36044_Digitised_Thesis.pdf.

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The performance of an adaptive filter may be studied through the behaviour of the optimal and adaptive coefficients in a given environment. This thesis investigates the performance of finite impulse response adaptive lattice filters for two classes of input signals: (a) frequency modulated signals with polynomial phases of order p in complex Gaussian white noise (as nonstationary signals), and (b) the impulsive autoregressive processes with alpha-stable distributions (as non-Gaussian signals). Initially, an overview is given for linear prediction and adaptive filtering. The convergence

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26

Murphy, Damian Thomas. "Digital waveguide mesh topologies in room acoustics modelling." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313846.

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27

Saaifan, Khodr [Verfasser]. "Advanced Detection Schemes of Digital Signals in Impulse Noise / Khodr Saaifan." Aachen : Shaker, 2015. http://d-nb.info/1080763694/34.

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28

Paluri, Suraj, and Sandeep Patluri. "A Study of Impulse Response System Identification." Thesis, Karlstad University, Faculty of Technology and Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-1069.

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<p>In system identification, different methods are often classified as parametric or non-parametric methods. For parametric methods, a parametric model of a system is considered and the model parameters are estimated. For non-parametric methods, no parametric model is used and the result of the identification is given as a curve or a function.</p><p>One of the non-parametric methods is the impulse response analysis. This approach is dynamic simulation. This thesis introduces a new paradigm for dynamic simulation, called impulse-based simulation. This approach is based on choosing a Dirac funct

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29

Wu, Tsan-Ming. "Statistical impulse reponse modeling and dereverberation for room acoustics." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/14932.

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30

Massé, Pierre. "Analysis, Treatment, and Manipulation Methods for Spatial Room Impulse Responses Measured with Spherical Microphone Arrays." Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS079.

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L'utilisation de réponses impulsionnelles spatiales de salles (spatial room impulse response, SRIR) dans la reproduction d'effets de réverbération de salle tri-dimensionnels connaît aujourd'hui une réelle démocratisation grâce à la commercialisation répandue d'antennes sphériques de microphones (spherical microphone array, SMA) et à une capacité de calcul numérique en croissance continue. Ces SRIR peuvent reproduire des effets de réverbération spatialisés sur des dispositifs immersifs ("surround-sound") à travers des convolutions multicanal de plus en plus performantes. De cette utilisation dé

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31

Wu, Qing. "Characterization of Impulse Noise and Hazard Analysis of Impulse Noise Induced Hearing Loss using AHAAH Modeling." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1467.

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Millions of people across the world are suffering from noise induced hearing loss (NIHL), especially under working conditions of either continuous Gaussian or non-Gaussian noise that might affect human's hearing function. Impulse noise is a typical non-Gaussian noise exposure in military and industry, and generates severe hearing loss problem. This study mainly focuses on characterization of impulse noise using digital signal analysis method and prediction of the auditory hazard of impulse noise induced hearing loss by the Auditory Hazard Assessment Algorithm for Humans (AHAAH) modeling. A dig

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Sahmoudi, Mohamed. "Processus alpha-stables pour la séparation et l'estimation robustes des signaux non-gaussiens et/ou non-stationnaires." Paris 11, 2004. http://www.theses.fr/2004PA112283.

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L’objectif principal de ce travail de thèse est de développer de nouvelles techniques robustes pour le traitement des signaux non-gaussiens et/ou nonstationnaires dans des environnements impulsifs. Plus précisément, le travail de cette thèse de doctorat se situe au carrefour des deux problématiques suivantes: I- Séparation aveugle de mélanges linéaires de sources impulsives : Ce problème a été peu étudié pour certains cas statistiquement ardus. En effet, lorsque les sources sont modélisées par des lois alpha-stables, les méthodes classiques ne s’appliquent plus, car la densité de probabilité n

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Schulte, Walter B. "The frequency response, impulse response, and transfer function of an ocean waveguide /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FSchulte.pdf.

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Thesis (M.S. in Applied Science (Signal Processing))--Naval Postgraduate School, June 2004.<br>Thesis advisor(s): Lawrence J. Ziomek. Includes bibliographical references (p. 47). Also available online.

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34

Salmer, Christophe. "Contribution à l'étude de la stabilité d'impulsion à impulsion d'un émetteur état solide pour radar." Lille 1, 1999. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1999/50376-1999-275.pdf.

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La stabilité d'impulsion à impulsion est une caractéristique primordial d'un radar de surface. Elle représente la variation de phase et d'amplitude entre impulsions successives du signal hyperfréquence et entraîne une dégradation (perte de détection, création de fausse alarme) du fonctionnement du radar. Notre travail a principalement consisté en une meilleure définition et compréhension de ce problème complexe de stabilité qui présente une importance capitale lors de la conception et de la certification d'un équipement radar. Après un rappel du principe général de fonctionnement d'un radar im

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35

Feirstine, Kelly Renee. "A Study of the Impact of Hardware Design Choices on the System Impulse Response of a Signal-level Radar Simulation." Wright State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=wright1156968416.

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36

Chaouki, Saïd. "Logiciel de traitement du signal." Rouen, 1987. http://www.theses.fr/1987ROUES024.

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Etude d'un algorithme pour le traitement d'un signal. Cet algorithme est composé de différents programmes indépendants permettant le calcul des polynômes orthonormaux, le calcul récursif, le calcul de la transformée de Fourier, de densité spectrale, réponse impulsionnelle d'un filtre numérique. Application à la reconnaissance des formes et simulation du processus de Lévy

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Logette, Patrice. "Etude et réalisation d'un processeur acousto-optique numérique de traitement des signaux." Valenciennes, 1997. https://ged.uphf.fr/nuxeo/site/esupversions/bbfd31df-2499-46a6-843d-52f346b1db41.

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Un système hybride acousto-optique/numérique axe principalement sur le filtrage F. I. R. A été développé au laboratoire dans le cadre d'une thèse antérieure. L'objet du présent travail est, d'une part, d'améliorer le système existant et, d'autre part, de tester les aptitudes du système ainsi modifié à effectuer d'autres types de calcul. Nous commençons par un résumé des travaux relatifs à l'ancien système, afin de bien positionner le problème. Nous exposons ensuite la conception du nouveau système. Une première partie décrit les modifications des circuits électroniques, avec l'utilisation de c

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Mercure, Virginie. "La peinture comme impulsion pour un dynamisme psychique." Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/29340/29340.pdf.

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La conscience d’un individu se développe au fil du temps par expérimentation, imitation et conditionnement. Sa compréhension du monde se construit à partir de déductions logiques qui s’appuient à la fois sur un désir d’acceptation sociale et sur son émotivité propre. Pour conserver l’équilibre psychique ainsi acquis, l’attitude qu’il adopte, dictée par cette vision du monde, peut devenir de plus en plus rigide. Il serait cependant possible de prendre en charge l’évolution de la conscience par une mise en mouvement volontaire de l’esprit. Celle-ci permettrait la participation positive de l’inco

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Rivenq, Atika. "Etude de systèmes anti-collision basés sur les techniques radar pour véhicules routiers." Valenciennes, 1996. https://ged.uphf.fr/nuxeo/site/esupversions/08c0d176-22f2-43e1-9790-c2656a116cac.

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L’objectif de ce travail est de concevoir un radar anticollision micro-onde qui sera embarqué sur les véhicules pour renforcer la sécurité routière. Deux technologies radars ont été testées : le radar à impulsions et le radar à modulation de fréquence. Les deux radars sont adaptés à la détection d'obstacles, mais ne permettent pas la détection de certains intervalles de distances. La solution a été d'associer ces deux radars dans un seul ensemble que nous appelons radar bi mode. Ce dernier a été ainsi réalisé et teste avec succès en temps réel. Dans cette étude, nous nous sommes intéressés aux

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August, Nathaniel J. "Medium Access Control in Impulse-Based Ultra Wideband Ad Hoc and Sensor Networks." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/27594.

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This thesis investigates distributed medium access control (MAC) protocols custom tailored to both impulse-based ultra wideband (I-UWB) radios and to large ad hoc and sensor networks. I-UWB is an attractive radio technology for large ad hoc and sensor networks due to its robustness to multipath fading effects, sub-centimeter ranging ability, and low-cost, low-power hardware. Current medium access control (MAC) protocols for I-UWB target small wireless personal area networks (WPANs) and cellular networks, but they are not suitable for large, multihop ad hoc and sensor networks. Therefore, this

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Giorgadze, Nino. "Factors Influencing Impulse Buying in Retail Stores." Master's thesis, Vysoká škola ekonomická v Praze, 2014. http://www.nusl.cz/ntk/nusl-193315.

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Impulse buying is a widely pervasive phenomenon. Statistics shows that more and more shoppers are experiencing irresistible urge to purchase unplanned and in most cases unnecessary product. Existing researches fall short in identifying most suitable tools that marketers can adopt in order to promote impulsive sales. Therefore, this thesis provides deep analysis of those, controllable factors that influence impulse buying. Particularly four external cues are examined: product display, promotional signage, sensory elements and social atmospherics. Research has deductive approach. First, existing

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Tesfamariam, Gebremichael Te-ame [Verfasser], Abdelhak M. [Akademischer Betreuer] Zoubur, and Dilip S. [Akademischer Betreuer] Mali. "Signal Processing Techniques for Landmine Detection Using Impulse Ground Penetrating Radar (ImGPR) / Gebremichael Te-ame Tesfamariam. Betreuer: Abdelhak M. Zoubur ; Dilip S. Mali." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2013. http://d-nb.info/1107770718/34.

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Mauuary, Didier. "Détection, estimation et identification pour la tomographie acoustique océanique : étude théorique et expérimentale." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0033.

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La tomographie acoustique oceanique s'est developpee depuis une quinzaine d'annees en apparaissant comme un moyen jusque-la inexistant d'observer la dynamique des oceans sur des espaces de grandes echelles (100, 1000 km) et sur de longues periodes (1 mois, 1 an). Mais le principe de faisabilite de la methode est encore au cur du probleme surtout pour les zones experimentees par les laboratoires francais et europeens. Les resultats experimentaux ont remis en cause les procedes classiques de traitement du signal. Les instruments et la chaine de pretraitement ont fait l'objet d'une etude complete

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Jaoua, Nouha. "Estimation Bayésienne non Paramétrique de Systèmes Dynamiques en Présence de Bruits Alpha-Stables." Phd thesis, Ecole Centrale de Lille, 2013. http://tel.archives-ouvertes.fr/tel-00929691.

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Dans un nombre croissant d'applications, les perturbations rencontrées s'éloignent fortement des modèles classiques qui les modélisent par une gaussienne ou un mélange de gaussiennes. C'est en particulier le cas des bruits impulsifs que nous rencontrons dans plusieurs domaines, notamment celui des télécommunications. Dans ce cas, une modélisation mieux adaptée peut reposer sur les distributions alpha-stables. C'est dans ce cadre que s'inscrit le travail de cette thèse dont l'objectif est de concevoir de nouvelles méthodes robustes pour l'estimation conjointe état-bruit dans des environnements

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Singh, Latchman. "Speech enhancement for forensic applications." Thesis, Queensland University of Technology, 1998. https://eprints.qut.edu.au/36080/1/36080_Singh_1998.pdf.

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Forensic audio recordings are usually made with a single covert microphone in non-ideal conditions. In non-ideal conditions the recordings are highly susceptible to various types of noise. The noise is usually broadband noise, co-talker interference, impulsive noise, narrow band noise or convolutional noise. There are existing speech enhancement techniques available to suppress most of the noise types mentioned, but when the noise is of a considerable level the performance of most enhancement techniques tend to decrease significantly. This thesis presents a study of speech enhancement techniq

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Nascimento, Felipe da Trindade do. "Algoritmos Genéticos para Síntese de Filtros Aplicados em Controle por Modo Deslizante." Universidade do Estado do Rio de Janeiro, 2010. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=7527.

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Nesta Dissertação propõe-se a aplicação de algoritmos genéticos para a síntese de filtros para modular sinais de controladores a estrutura variável e modo deslizante. A modulação do sinal de controle reduz a amplitude do sinal de saída e, consequentemente, pode reduzir o consumo de energia para realizar o controle e o chattering. Esses filtros também são aplicados em sistemas que possuem incertezas paramétricas nos quais nem todas as variáveis de estado são medidas. Nesses sistemas, as incertezas nos parâmetros podem impedir que seus estados sejam estimados com precisão por observadores. A sín

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Barbounaki, Stavroula. "Modélisation et traitement numérique des impulsions électriques générées par le passage des globules rouges à travers des micropores." Paris 5, 1997. http://www.theses.fr/1997PA05S030.

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Pour évaluer la déformabilité érythrocytaire qui est un facteur important du comportement rhéologique du sang au niveau de la microcirculation, il existe plusieurs techniques. Parmi ces techniques, on distingue celle de mesure du temps de transit des globules rouges a travers des micropores. Cette technique de filtration permet d'étudier la variation de la conductance électrique du filtre à travers lequel passent les globules rouges considérés comme particules non conductrices. Afin de pouvoir mieux comprendre ce phénomène, un modèle théorique approprié à été mis au point pour valider la métho

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48

Fayolle, Gérard. "Conceptions et applications de circuits à mémoire de courant basse tension." Grenoble 1, 1998. http://www.theses.fr/1998GRE10151.

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Ce travail presente deux circuits bases sur les memoires de courant. Les applications developpees sont capables de travailler avec des alimentations en tension de 3v et moins. Pour ces realisations, il a ete necessaire de developper a la fois de nouvelles memoires de courants ainsi que des architectures originales pour repondre a tous les criteres des cahiers des charges. La premiere realisation est un fir pour une application video dont la fonction est, en sortie d'un filtre continu, d'y transferer une partie des contraintes de rejection. La phase lineaire que presente ce type de filtre se pr

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Schulte, Walter B. III. "The frequency response, impulse response, and transfer function of an ocean waveguide." Thesis, Monterey, California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1516.

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Approved for public release, distribution is unlimited<br>In this thesis, the ocean was modeled as a waveguide with an ideal pressure - release surface, and an ideal rigid bottom. The ocean waveguide was then treated as a linear, time - invariant, space - variant (TISV) filter or communication channel. The filter is time - invariant because no motion was modeled and because the properties of the ocean were assumed to be constant. The filter is space - variant because of the presence of the two boundaries, that is, the ocean surface and ocean bottom. This thesis investigates the ocean as a line

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Dilungana, Stéphane. "Apprentissage automatique et optimisation pour la détermination des propriétés acoustiques d'une salle à partir de signaux audio." Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAD015.

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L'objectif de cette thèse est de contribuer à améliorer significativement le diagnostic acoustique de salles in situ en développant des nouvelles approches à la croisée de l'apprentissage automatique, de l'optimisation, du traitement du signal audio et de la physique acoustique. Les travaux présentés dans ce manuscrit portent sur l'estimation des propriétés d'absorption acoustique de chacune des parois d'une salle à partir de plusieurs réponses impulsionnelles de salle acquises pour des positions libres de sources et de microphones, ainsi que de mesures des paramètres géométriques et des répon

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