Letteratura scientifica selezionata sul tema "Distorsion du signal"
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Articoli di riviste sul tema "Distorsion du signal":
Asnil, Asnil. "Unjuk Kerja Filter Pasif dalam Mereduksi Distorsi Gelombang pada AC/DC Konverter". JTEV (Jurnal Teknik Elektro dan Vokasional) 6, n. 2 (29 maggio 2020): 122. http://dx.doi.org/10.24036/jtev.v6i2.108695.
Balleteros Csmcho, Manuel Ivan, Francy Julieth Cadena Villalba e Adolfo Andres Jaramillo Matta. "TÉCNICAS DE PROCESAMIENTO DE SEÑALES UTILIZADAS PARA EL ANÁLISIS DE LA DISTORSIÓN ARMÓNICA GENERADA POR VARIADORES DE FRECUENCIA EN MOTORES DE INDUCCIÓN". Redes de Ingeniería 6, n. 1 (5 settembre 2015): 72. http://dx.doi.org/10.14483/udistrital.jour.redes.2015.1.a05.
Mayol, Alexandre, e Simon Porcher. "Tarifs discriminants et monopoles de l’eau potable : une analyse de la réaction des consommateurs face aux distorsions du signal-prix". Revue économique 70, n. 4 (2019): 461. http://dx.doi.org/10.3917/reco.pr2.0144.
Ribani, Cyril. "Tarifs discriminants et monopoles de l’eau potable : une analyse de la réaction des consommateurs face aux distorsions du signal-prix". Action publique N° 14, n. 2 (2 gennaio 2022): 42. http://dx.doi.org/10.3917/aprp.014.0042.
Guzmán, Ian Carlo, Jose Luis Oslinger e Ruben Darío Nieto. "Wavelet denoising of partial discharge signals and their pattern classification using artificial neural networks and support vector machines". DYNA 84, n. 203 (1 ottobre 2017): 240–48. http://dx.doi.org/10.15446/dyna.v84n203.63745.
Susilo, Deddy, Budihardja Murtianta e Albert Tarra Wahyu Setiadi. "Sistem Pensaklaran pada Masukan dan Keluaran Penguat Awal Audio". Techné : Jurnal Ilmiah Elektroteknika 18, n. 02 (10 ottobre 2019): 147–54. http://dx.doi.org/10.31358/techne.v18i02.218.
Marenco, F., V. Amiridis, E. Marinou, A. Tsekeri e J. Pelon. "Airborne verification of CALIPSO products over the Amazon: a case study of daytime observations in a complex atmospheric scene". Atmospheric Chemistry and Physics Discussions 14, n. 7 (4 aprile 2014): 9203–24. http://dx.doi.org/10.5194/acpd-14-9203-2014.
Suharyanto, Suharyanto, Frieyadie Frieyadie e Sandra Jamu Kuryanti. "PENINGKATAN KUALITAS CITRA BAWAH AIR BERBASIS ALGORITMA FUSION DENGAN KESEIMBANGAN WARNA, OPTIMALISASI KONTRAS, DAN PEREGANGAN HISTOGRAM". INTI Nusa Mandiri 16, n. 1 (8 agosto 2021): 31–38. http://dx.doi.org/10.33480/inti.v16i1.2286.
Maulana Hadiansyah, Walid. "Estimasi Kanal Sistem OFDM pada Kanal Fading Rayleigh dengan Metode Piece-wise Linear". Journal of Computer, Electronic, and Telecommunication 1, n. 2 (14 gennaio 2021). http://dx.doi.org/10.52435/complete.v1i2.70.
Pujiono, Pujiono, e Andi Syaiful Amal. "Model Beer-Lambert untuk Perbaikan Warna Objek Bawah Laut Berbasis Estimasi Absorpsi Cahaya". Seminar Keinsinyuran Program Studi Program Profesi Insinyur 3, n. 1 (3 maggio 2023). http://dx.doi.org/10.22219/skpsppi.v3i1.7985.
Tesi sul tema "Distorsion du signal":
Pagot, Jean-Baptiste. "Modeling and monitoring of new GNSS signal distortions in the context of civil aviation". Phd thesis, Toulouse, INPT, 2016. http://oatao.univ-toulouse.fr/17864/1/PAGOT_JB.pdf.
Da, Silva Jeferson Jhone. "Développement d'outils pour le suivi non-invasif de la pression intracrânienne par des produits de distorsion acoustiques". Thesis, Université Clermont Auvergne (2017-2020), 2019. http://www.theses.fr/2019CLFAS010.
Non-invasive measurement of intracranial pressure (ICP) has been a research topic for decades, as invasive methods carry risks of hemorrhages and infections. Non-invasive monitoring by cochlear responses has been suggested as a reliable method. One of the most common solutions considered in these methods is the Distortion Products of Otoacoustic Emissions (DPOAE). The DPOAE measurement is quick and simple, as it only requires sending a sound stimulation and recording the cochlear acoustic response using a single probe (such as an earphone). The DPOAE phase shift is the parameter that allows us to monitor the ICP variations. As this is a relative measure, it is necessary to have an individual reference that should not be changed during or between measurements. In addition, the age of the patient influences the DPOAE levels which generally reduce with aging. They are also fragile and very sensitive to the acoustic environment, especially the noise from the patient. This work first presents the development of a signal processing method based on signal distribution analysis for automatic identification and rejection of noisy sections, in order to improve the robustness of the signal extraction from acoustic background noise. The developed method was compared to the rejection thresholds based on operator visual analysis (standard method). The results indicated a statistically lower noise level and more stable signals when using the automatic method. A second study presents a probe positioning and air leak detection technique (AFPS), based on the frequency response analysis of the pressure measured in the external ear canal after wideband stimulation. In this study, a tilt table was used to induce a slight variation in the ICP in four positions (60°, 0°, -20° and again 60°) into two series of measurements. We analyzed the reproducibility between the two tests and the effects on the test results of probe displacement and air leakage when they were identified. These analyses indicated that the AFPS is able to correctly classify the signals according to the occurrence of air leaks or probe movement. In the last experiment, both techniques (automatic rejection and AFPS) were adapted to be used in real time, to identify and correct any problems before or during the test. We compared the modified device and the commercial device in two test sessions, so that each device was used for both ears. In each session, three tests were performed (T1, T2 and T3), each with five values recorded for each of the three positions (45°, 0° "lying down" and -10°). These three tests were performed to allow the analysis of the reproducibility of the measurements, without and with a probe replacement effect, and its accuracy (expressed as the standard deviation of the differences). The AFPS increases robustness, providing more consistent values in all analyses, especially if the probe is repositioned. Automatic rejection reduces the variability between the five measurements taken for the same position, thus increasing the stability and accuracy of the responses
Thiesse, Jean-Marc. "Codage vidéo flexible par association d'un décodeur intelligent et d'un encodeur basé optimisation débit-distorsion". Phd thesis, Université de Nice Sophia-Antipolis, 2012. http://tel.archives-ouvertes.fr/tel-00719058.
Rossello, Norbert. "Optimisation par traitement de signal et automatique de la pureté spectrale de forts signaux d'émission : application aux émissions sonar". Nice, 1990. http://www.theses.fr/1990NICE4416.
Muquet, Bertrand. "Nouveaux schémas de réception et décodage pour les systèmes OFDM sans fil avec préfixe cyclique ou zero-padding". Paris, ENST, 2001. http://www.theses.fr/2001ENST0022.
Guénégo, Béatrice. "Conversion numérique de signaux biologiques de faibles intensités pour les applications biomédicales". Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPAST230.
According to the World Health Organization, cardiac ischemia is the world's leading cause of death. Ischemia is an insufficient vascularization of myocardial cells, which, if prolonged, leads to the necrosis of part of the heart, i.e., a cardiac infarction, endangering the patient's life. However, if ischemia is treated in time, it can have no impact on the patient's health. An embedded system that detects cardiac ischemia over long periods, without requiring medical staff monitoring, and provides alerts would enable patients to be taken care of earlier, increasing their chances of avoiding a heart attack.The electrocardiogram (ECG) is a measurement of the heart's electrical activity, commonly used in medicine to make an initial diagnosis. Examining the signal morphology and the time intervals between different events gives hints of eventual pathologies. The diagnosis of ischemia is based on variations in the part of the ECG named ST segment. Some embedded systems using the ECG to detect cardiac arrhythmias already exist, but none target cardiac ischemia. In this context, the originality of this work is in the design of an integrated system that can detect ST segment variations for ischemia diagnosis. The main difficulties of such a system's design are ST segment preservation during the acquisition stage and the conception of a signal processing method adapted to integrated circuits (power consumption, complexity, ST segment preservation).In this thesis, we studied the design of an integrated system for ECG acquisition and processing for cardiac ischemia detection. The various circuits, simulations, and layouts were realized in 180 nm using XFAB xh018 technology. The standard giving minimum performance for electrocardiograms published by the International Electrotechnical Commission (IEC) was used to quantify ST-segment distortion. We first designed an analog acquisition stage from the system to the transistor level. Simulations of this stage were then carried out to confirm its compliance with the IEC standard and to estimate its power consumption. As the design of an analog-to-digital converter is not new to the state of the art, it was not addressed during this thesis. Then, we conceived an integrated implementation of the discrete wavelet transform, used to eliminate noise and obtain information on the signal's fiducial points while retaining the possibility of reconstructing the signal. We first simulated an implementation of Mallat's algorithm in Python, which was then realized in VHDL, and finally, the place and route step was carried out for several wavelets. Layouts and post-layout simulation results were used to determine which wavelet offered the best trade-off between signal distortion, baseline wander elimination, power consumption, and circuit area.This work covers the design and dimensioning of the essential blocks of an ECG acquisition chain dedicated to ST segment detection that can be integrated. It may be completed by implementing an embedded decision-making method before the physical realization of the chip
Payan, Frédéric. "Optimisation du compromis débit/distorsion pour la compression géométrique de maillages surfaciques triangulaires". Phd thesis, Université de Nice Sophia-Antipolis, 2004. http://tel.archives-ouvertes.fr/tel-00011445.
géométriques permettent l'utilisation de modèles théoriques pour le
débit et la distorsion des sous-bandes de coefficients. Finalement,
nous proposons un codeur géométrique incluant une allocation rapide et performante qui optimise la quantification des coefficients pour que la qualité visuelle de l'objet reconstruit soit maximisée sous la contrainte d'un débit total fixé. Expérimentalement, l'algorithme
proposé donne de meilleurs résultats que toutes les méthodes de l'état de l'art.
Hamoud, Houssam Eddine. "Linéarisation par pré-distorsion numérique d'amplificateurs de puissance pour les nouvelles générations des systèmes de télécommunications". Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0110.
Modern communications systems converge towards multi-standard operation combined with high PAPR modulation formats where the power amplifier must first be optimized in efficiency and where linearity will then be corrected by adding a predistorter. If this solution seems functional, it seems inadequate and ineffective on 5G systems where the targeted bandwidths pose both architectural problems (complexity of the observation path) and problems of accuracy of the usual behavioural models based on a simplification of the Volterra series in its discrete form (GMP, DDR) in the face of exacerbated memory effects but also of energy efficiency of the linearized system (DPD+PA). In this context, it becomes necessary to move towards a predistorter model less dependent on the characteristics of the signal to be linearized, in particular by the TPM (Two path Memory) model developed at XLIM, based on a simplification of the Volterra series in its continuous form, is independent of the characteristics of the signal to be linearized.Our work focused on evaluating the linearity performance of the classical models (GMP, DDR) and the TPM model on different power amplifiers either from simulations or from physical measurements of the PA. To do this, we have set up a simulation environmentand an evaluation bench for predistortion models with physical PA in order to quantify ACPR performance according to the variation in signal characteristics (power, frequency, statistics). All these experiments made it possible to verify, on the one hand,the poor robustness of traditional approaches (GMP/DDR) and, on the other hand, the stability of the performance of the TPM approach, whatever the scenario envisaged. This study therefore paves the way for a new generation of pre-distributor which, if extracted once and for all, would only require an update on slow dynamic phenomena (ageing) and would make it possible to consider a simplified architecture of the DPD observation path; thus improving the overall energy efficiency of the linearizedsystem
Akam, Bita Isidore Paul. "Sur une approche de l'analyse en composantes indépendantes à la compression des images multi composantes". Phd thesis, Université Joseph Fourier (Grenoble), 2007. http://tel.archives-ouvertes.fr/tel-00151987.
Picard, Guillaume. "Traitement statistique des distorsions non-linéaires pour la restauration des enregistrements sonores". Phd thesis, Télécom ParisTech, 2006. http://pastel.archives-ouvertes.fr/pastel-00002315.
Capitoli di libri sul tema "Distorsion du signal":
FOURCAUD, Christine. "Quand les visages ne parlent plus. « Avoid talking »". In Les épidémies au prisme des SHS, 83–92. Editions des archives contemporaines, 2022. http://dx.doi.org/10.17184/eac.5993.
Atti di convegni sul tema "Distorsion du signal":
Davidoiu, Valentina, Thomas Maugey, Beatrice Pesquet-Popescu e Pascal Frossard. "Rate distorsion analysis in a disparity compensated scheme". In ICASSP 2011 - 2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2011. http://dx.doi.org/10.1109/icassp.2011.5946539.
Chuman, Tatsuya, e Hitoshi Kiya. "On the security of block scrambling-based image encryption including JPEG distorsion against jigsaw puzzle solver attacks". In 2017 Eighth International Workshop on Signal Design and its Applications in Communications (IWSDA). IEEE, 2017. http://dx.doi.org/10.1109/iwsda.2017.8095737.
Medina, P., N. A. Barbosa, J. A. Frausto, N. Lizárraga e I. Uriarte. "Uso de Radares Impulsivos de Banda Ultra-Ancha (IR-UWB) para la Medición de la Frecuencia Respiratoria". In XLI Congreso Nacional de Ingeniería Biomédica. Sociedad Mexicana de Ingeniería Biomédica, 2018. http://dx.doi.org/10.24254/cnib.18.26.