Signal Reconstruction
Mostrando 13-24 de 39 artigos, teses e dissertações.
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13. Padrões visuais de sinais de voz aravés de técnica de análise não linear / Voice signal discrimination with nonlinear analysis techniques
Human voice has been the focus of study for different areas of science. Researches in the last two decades have demonstrated the existence of chaos in human voice production. The purpose of this work is to use nonlinear dynamics techniques in the analysis of normal voices from healthy subjects and correlate them to traditional acoustic parameters as well as
Publicado em: 2006
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14. Stepped inversion of magnetic data / "Inversão por etapas de anomalias magnéticas bi-dimensionais"
This work presents a three step magnetic inversion procedure in which invariant quantities related to source parameters are sequentially inverted to provide i) cross-section of two-dimensional sources; ii)intensity of source magnetization, and iii) inclination of source magnetization. The first inverted quantity (called geometrical function) is obtained by r
Publicado em: 2006
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15. Studies about personalization of the head-related transfer function in binaural virtual auditory displays. / Estudos sobre personalização da função de transferência relativa à cabeça em sistemas biaurais de reprodução acústica virtual.
This work presents several proposals associated with the optimal use of head-related transfer functions (HRTF) in virtual auditory spaces presented via headphones. These proposals lead to personalization of the HRTF to particular individuals, using a combination of the structural and morphological modeling techniques. In the context of structural modeling, t
Publicado em: 2006
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16. Análise e síntese da fala por interpolação de ondas
This doctoral dissertation addresses to study of waveform interpolation (WI) for speech coding, and the description, visualization and implementation of an algorithm to simulate a conventional WI system of analysis synthesis of speech signal, like portion of a WI system for coding - decoding that operates on the outer layer which is called of WI analysis syn
Publicado em: 2005
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17. Metodo de sincronização de cameras de video utilizando a banda de audio
This work proposes and evaluates a novel method for synchronisation of video cameras using the audio band. The method consists in generating and transmitting an audio signal through radio frequency for receivers connected to the microphone input of the cameras and inserting the signal in the audio band. In a software environment, the phase differences among
Publicado em: 2005
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18. Fast neutral lithium beam for density and its fluctuation measurements at the boundary regions of ETE tokamak
A Fast Neutral Lithium Beam Probe (FNLBP) is being developed, in order, to perform measurement of the boundary plasma density in discharges of the Spherical Tokamak ETE, recently built at LAP/INPE. This plasma diagnostic method is adequate for use in fusion devices because it does not perturb the plasma and it provides data with high space and time resolutio
Brazilian Journal of Physics. Publicado em: 2002-03
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19. Desenvolvimento de um sistema de tomografia capacitiva para processos multifasicos
This work presents the development of a capacitive tomography system to the study of multiphase processes. The research starts with a literature review about tomography. A finite element analysis is accomplished to offer data for the optimization of the capacitance sensor and for a comparative analysis with the experimental results. The image reconstruction
Publicado em: 2002
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20. Vibroacoustic vharacterization using nearfield acoustic holography / Caracterização vibroacustica usando holografia acustica de campo proximo
In this work, the Nearfield Acoustic Holography technique - NAH was explored as an way to analyze vibroacoustic problems. Holography is a process that allows to determine acoustic fields characteristics using a Discrete Fourier Transform - DFT, from a regular grid of measurements obtained in an acoustic environment for which the Green s function is known. Th
Publicado em: 1999
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21. TOMOGRAFIA DE SUSCEPTIBILIDADE MAGNÉTICA COM MAGNETÔMETRO SUPERCONDUTOR SQUID / MAGNETIC SUSCEPTIBILITY TOMOGRAPHY USING A SUPERCONDUCTOR SQUID MAGNETOMETER
Several modalities of tomography have been developed for medical applications. Some example are x-ray tomography, positron emission tomography and magnetic resonance imaging which are used routinely in the clinical enviroment and electricall impedance tomography, still considered a research technique. During the seventies, measurements of the weak fields pro
Publicado em: 1996
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22. Three-dimensional, Bayesian image reconstruction from sparse and noisy data sets: Near-infrared fluorescence tomography
A method for inverting measurements made on the surfaces of tissues for recovery of interior optical property maps is demonstrated for sparse near-infrared (NIR) fluorescence measurement sets on large tissue-simulating volumes with highly variable signal-to-noise ratio. A Bayesian minimum-variance reconstruction algorithm compensates for the spatial variabil
The National Academy of Sciences.
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23. Reconstruction of in vivo time-evolving neuroendocrine dose–response properties unveils admixed deterministic and stochastic elements
Homeostasis in the intact organism is achieved implicitly by repeated incremental feedback (inhibitory) and feedforward (stimulatory) adjustments enforced via intermittent signal exchange. In separated systems, neurohormone signals act deterministically on target cells via quantifiable effector-response functions. On the other hand, in vivo interglandular si
National Academy of Sciences.
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24. 3'-Terminal nucletide sequence (n equals 361) of bacteriophage MS2 RNA.
32P-Labeled MS2 RNA was partially digested with ribonuclease T1 (guanyloribonuclease; ribonucleate 3'-guanylo-oligonucleotidohydrolase; EC 3.1.4.8) or with epilson-carboxymethyl-lysine-41 pancreatic ribonuclease A (ribonucleate 3'-pyrimidino-oligonucleotidohydrolase; EC 3.1.4.22). A series of overlapping fragments was obtained which allowed the reconstructio