Results 51 to 60 of about 769 (173)
Harmonic oscillators coupled by springs: Discrete solutions as a Wigner quantum system
, 2006 We consider a quantum system consisting of a one-dimensional chain of M identical harmonic oscillators with natural frequency ω, coupled by means of springs. Such systems have been studied before, and appear in various models.
J. Van Der Jeugt +5 more
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A revised discrete pseudo-Wigner distribution and its application to nonstationary signal analyses.
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C, 1991 Recently, several efforts have been directed towards developing a joint time and frequency representation for signal analysis. For a time-varying signal, whether a deterministic transient or nonstationary random signal, the use of a discrete pseudo-Wigner distribution (WD) is especially suitable.
ISHIMITSU, Shunsuke, KITAGAWA, Hajime
openaire +2 more sources
Multiple multidimensional morse wavelets
, 2007 This paper defines a set of operators that localize a radial image in space and radial frequency simultaneously. The eigenfunctions of the operator are determined and a nonseparable orthogonal set of radial wavelet functions are found. The eigenfunctions
Metikas, G, Olhede, SC
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Aplicacao de funcoes de Wigner discretas a analise tempo frequencia de sinais em plasmas de fusao.
, 2001 In this thesis, different discrete Wigner functions are studied and applied to situations requiring an appropriate discrete formalism. The Wigner function is reviewed in two fields: in physics, in the framework of the Weyl Wigner formulation of quantum ...
Figueiredo, Antonio Carlos Almeida
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Discrete Bai distribution function and its sampling requirements [PDF]
In recent years, many phase space distributions have been proposed, and one of the more independently interesting is the Bai distribution function (BDF).
Zheng, Yushi +2 more
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, 2004 An optimised time-frequency signal analysis software tool is presented here as a MATLAB toolbox. This toolbox is implemented using existing and novel methods for a specific class of Time-Frequency Distributions (TFDs) called quadratic TFDs. This is first
O'Toole, J. +3 more
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The multiresolution Fourier transform : a general purpose tool for image analysis [PDF]
The extraction of meaningful features from an image forms an important area of image analysis. It enables the task of understanding visual information to be implemented in a coherent and well defined manner.
Calway, Andrew David
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, 1993 The Wigner higher order moment spectra (WHOS) are defined as extensions of the Wigner-Ville distribution (WD) to higher order moment spectra domains. A general class of time-frequency higher order moment spectra is also defined in terms of arbitrary ...
Nikias, Chrysostomos L. +1 more
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The multiresolution Fourier transform and its application to polyphonic audio analysis [PDF]
Many people listen to, or at least hear, some form of music almost every day of their lives. However, only some of the processes involved in creating the sensations and emotions evoked by the music are understood in any detail.
Pearson, Edward R. S.
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Aquisição e processamento de sons crepitantes para auxílio ao diagnóstico de enfermidades pulmonares [PDF]
, 2011 Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2011O presente trabalho aborda o desenvolvimento e a implementação de um sistema de aquisição de sons ...
Ponte, Daniel Ferreira da
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