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Wyszukujesz frazę "Wigner Distribution" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    A new form of Gabor Wigner Transform by adaptive thresholding in Gabor Transform and Wigner Distribution and the power of signal synthesis techniques to enhance the strengths of GWT
    Autorzy:
    Ajab, M.
    Taj, I. A.
    Shafi, I.
    Stankovic, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/220882.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Gabor transform
    Wigner Distribution
    Gabor Wigner Transform
    signal synthesis
    Opis:
    In this paper, a modified form of the Gabor Wigner Transform (GWT) has been proposed. It is based on adaptive thresholding in the Gabor Transform (GT) and Wigner Distribution (WD). The modified GWT combines the advantages of both GT and WD and proves itself as a powerful tool for analyzing multi-component signals. Performance analyses of the proposed distribution are tested on the examples, show high resolution and crossterms suppression. To exploit the strengths of GWT, the signal synthesis technique is used to extract amplitude varying auto-components of a multi-component signal. The proposed technique improves the readability of GWT and proves advantages of combined effects of these signal processing techniques.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 1; 99-106
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of variants of Gabor-Wigner Transform for crossterm reduction
    Autorzy:
    Ajab, M.
    Taj, I. A.
    Khan, N. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/221743.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Wigner Distribution
    Gabor transform
    Gabor Wigner Transform
    fractional Fourier transform
    Opis:
    Gabor Wigner Transform (GWT) is a composition of two time-frequency planes (Gabor Transform (GT) and Wigner Distribution (WD)), and hence GWT takes the advantages of both transforms (high resolution of WD and cross-terms free GT). In multi-component signal analysis where GWT fails to extract auto-components, the marriage of signal processing and image processing techniques proved their potential to extract autocomponents. The proposed algorithm maintained the resolution of auto-components. This work also shows that the Fractional Fourier Transform (FRFT) domain is a powerful tool for signal analysis. Performance analysis of modified fractional GWT reveals that it provides a solution of cross-terms of WD and blurring of GT.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 3; 499-508
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of lung auscultatory phenomena using the Wigner-Ville Distribution
    Autorzy:
    Maciuk, M.
    Kuniszyk-Jóźkowiak, W.
    Doboszynska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/106244.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    Wigner-Ville Distribution
    WVD
    digital analysis
    auscultatory sound
    computer aided diagnosis
    Short-Time Fourier Transform
    STFT
    Smoothed Wigner-Ville Distribution
    SWVD
    Opis:
    In this paper the authors will try to discuss the applicability of Wigner-Ville Distribution for the digital analysis of auscultatory sounds. First of all, thte issues related to computer aided diagnosis are presented. Next, the methodology of research is shown and subsequently, the types of sounds are described. Another element of this work is the presentation of issues related to the digital signal processing including the Short-Time Fourier Transform(STFT), Wigner-Ville Distribution (WVD), and its variation - Smoothed Wigner-Ville Distribution (SWVD). This paper summarizes the results obtained using STFT and SWVD, showing SWVD more useful to detect the type of auscultatory sounds.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2012, 12, 1; 7-16
    1732-1360
    2083-3628
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The phase-space approach to time evolution of quantum states in confined systems: The spectral split-operator method
    Autorzy:
    Kołaczek, Damian
    Spisak, Bartłomiej J.
    Wołoszyn, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/330780.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    Wigner distribution function
    Moyal dynamics
    spectral split operator method
    funkcja dystrybucji Wignera
    dynamika Moyal
    metoda podziału operatora
    Opis:
    Using the phase space approach, we consider the quantum dynamics of a wave packet in an isolated confined system with three different potential energy profiles. We solve the Moyal equation of motion for the Wigner function with the highly efficient spectral split-operator method. The main aim of this study is to compare the accuracy of the employed algorithm through analysis of the total energy expectation value, in terms of deviation from its exact value. This comparison is performed for the second and fourth order factorizations of the time evolution operator.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2019, 29, 3; 439-451
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advanced time-frequency representation in voice signal analysis
    Autorzy:
    Mika, Dariusz
    Józwik, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/102330.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    signal analysis
    spectrogram
    time-frequency analysis
    time-frequency representation
    Cohen’s class
    Wigner-Ville distribution
    analiza sygnału
    spektrogram
    analiza czasu
    analiza częstotliwości
    reprezentacja czasu i częstotliwości
    klasa Cohena
    rozkład Wignera-Ville'a
    Opis:
    The most commonly used time-frequency representation of the analysis in voice signal is spectrogram. This representation belongs in general to Cohen’s class, the class of time-frequency energy distributions. From the standpoint of properties of the resolution, spectrogram representation is not optimal. In Cohen class representations are known which have a better resolution properties. All of them are created by smoothing the Wigner-Ville’a distribution characterized by the best resolution, however, the biggest harmful interference. The used smoothing functions decide about a compromise between the properties of resolution and eliminating harmful interference term. Another class of time-frequency energy distributions is the affine class of distributions. From the point of view of readability of analysis of the best properties are known so called Redistribution of energy caused by the use of a general methodology referred to as reassignment to any time-frequency representation. Reassigned distributions efficiently combine a reduction of the interference terms provided by a well adapted smoothing kernel and an increased concentration of the signal components.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 1; 251-259
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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