Digital Processing Of Signals
Mostrando 1-12 de 43 artigos, teses e dissertações.
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1. Fault Detection in High Speed Helical Gears Considering Signal Processing Method in Real Simulation
Abstract In the present study, in order to detect the fault of the gearmeshs, two engaged gears based on research department of a major automotive company have been modeled. First off, by using the CATIA software the fault was induced to the output gear. Then, the faulty gearmesh and non-faulty gearmesh is modeled to find the fault pattern to predict and est
Lat. Am. j. solids struct.. Publicado em: 2016-11
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2. A Multilayer Approach for Optical Network Planning
With the increase in demand to Backbone networks, one became fundamental the application of new telecommunication technologies for efficient use of devices and optical links, such as xPSK modulations with dual polarization, dispersion compensating fibers, coherent detection and digital processing signals. Thus, network planning using analytical models have b
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-03
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3. Hardware embedded fiber sensor interrogation system using intensive digital signal processing
The description of an interrogation system for fiber Bragg grating sensors is reported. The full implementation in hardware of the required signal processing is proposed and made publicly available. The hardware description is implemented in a field programmable gate array (FPGA) development kit and the processing units allow one to control an optoelectronic
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2014-12
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4. Reconhecimento de PadrÃes AtravÃs de AnÃlises EstatÃsticas e Fractais Aplicadas a Dados de Ensaios NÃo-Destrutivos / Pattern Recognition by Statistical Fluctuation and Fractal Analyses Applied to Nondestructive Testing Data
In this work a procedure is studied for pattern classification related to different types of data, namely: (1) signals obtained from ultrasonic testing ( pulse-echo technique) and magnetic signals obtained from BarkhÃusen noise in samples of ferritic-pearlitic carbon steel tubes which, due to temperature effects, have shown microstructural changes as conseq
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/12/2011
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5. Processamento de sinais de descargas parciais em tempo real com base em wavelets e seleção de coeficientes adaptativa espacialmente
On-line partial discharge (PD) analysis is a highly pursued feature due to the economy related to scheduled shutdowns, disassembling and transport. Nevertheless, on-site PD measurements are frequently limited by interferences found in high-voltage facilities, a situation that imposes the continued development of PD signal processing methods. In the last year
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/11/2011
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6. Sobre modelos e métodos de estimação de direção de chegada de sinais em sistemas digitais de comunicação sem fio / On models and methods for direction of arrival estimation of signals in digital wireless communication systems
This thesis deals with the problem of estimating the direction of arrival of digitally modulated signals, specifically found in the uplink of multiuser wireless communication systems where the base station uses an antenna array. The main objectives of the thesis are: to clarify some details normally not treated in the description of the data models assumed i
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/08/2011
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7. Contribuições ao problema de separação cega de fontes, com ênfase no estudo de sinais esparsos / Contributions to the problem of blind source separation, with emphasis on the study of sparse signals
Neste trabalho, foi estudado o problema de Separação Cega de Fontes (BSS), com ênfase nos casos chamados de subparametrizados, isto é, em que o número de fontes é maior do que o de misturas. A primeira contribuição proposta foi a de um limitante relacionado ao erro de inversão intrínseco ao problema quando é utilizada uma estrutura linear de separ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/08/2011
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8. MODELING OF THE CARDIAC ELECTRODYNAMICS AND OF THE EFFECTS OF SPATIAL AND TIME RESOLUTION ON OPTICAL MAPS / MODELAGEM DA ELETRODINÂMICA CARDÍACA E DOS EFEITOS DA RESOLUÇÃO ESPACIAL E TEMPORAL EM MAPAS ÓPTICOS
Fluorescence studies using potentiometric dyes to optically measure the action potential of cardiac cells constitute an important tool to better understand the electrophysiology of the heart. However, in many experimental setups, the finite sensing area of optical detectors cannot be neglected. As a consequence, the detected fluorescence signal may effective
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/02/2011
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9. Empirical propagation model to digital TV signals in Curitiba / Modelo de propagaÃÃo empÃrico para sinais de TV digital em Curitiba
The channel modeling is of crucial importance in determining the path loss of RF signals emitted by a transmitter. This work aimed at determining a channel model, by means of the analysis of measurement of the received signals levels from a TV Digital transmitter operating in the UHF range during a survey in the region of Curitiba. From the comparison of som
Publicado em: 2009
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10. Conversão simbólica de sinais digitais por meio da Teoria de Extremos Relativos
The goal is to develop a new technique for symbolic conversion of digital signals, called Quantization based on Relative Extrema (QBER). This technique can convert unidimensional digital signals into strings. The technique QBER, formalized in this proposal, uses Relative Extrema Theory (TER ) and signals similarity functions, as metric Edit Distance with Rea
Publicado em: 2009
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11. Detecção do complexo QRS em sinais cardiacos utilizando FPGA / QRS complex detection in cardiac signals using FPGA
The electrocardiogram (ECG) is a tool used for diagnosis of diseases related to the heart. This work has the purpose of detecting QRS complex, focusing on the R wave, which represents the ventriclescontraction. It is presented two techniques of processing ECG signals. The first uses Pan &Tompkins algorithm based on digital filtering. The second uses the di
Publicado em: 2009
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12. Estimation of parameters of signals generated by time invariant linear systems / Estimação de parâmetros de sinais gerados por sistemas lineares invariantes no tempo
A study on the recovery of signals modeled by weighted sums of complex exponentials complex is presented. For this, basic concepts of signals and systems theory are introduced. In particular, the linear time invariant systems (LTI Systems) are considered, which can be mathematically represented by differential equations or difference equations, respectively,
Publicado em: 2009