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Analysis of lung auscultatory phenomena using the Wigner-Ville Distribution

Maciuk M., Kuniszyk-Jóźkowiak W., Doboszynska A., Maciuk M.

Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica

2012

Vol. 12, no. 1

7--16

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.

Binary Quantization of 2D Images Obtained From Short Time Fourier Transform And Wigner-Ville Distribution Methods Used in Power Quality Investigation

Zygarlicka M.

Zeszyty Naukowe. Elektryka / Politechnika Opolska

2009

z. 62

81-82

It's very well known in the signal processing community, that the Wigner-Ville Distribution (WVD) - a bilinear time-frequency representation - introduce some artifacts (cross-terms), while analyzing a multi-component signal. Even though the WVD has very good time-frequency resolution. But these cross-terms complicate both visual interpretation and extraction of required information from the WVD of the multi-component signal.

Metody diagnozowania stanu technicznego amortyzatorów zabudowanych w samochodach osobowych

Gardulski J.

Zeszyty Naukowe. Transport / Politechnika Śląska

2006

z. 63

307-314

W artykule przedstawiono nową metodę diagnozowania amortyzatorów samochodów osobowych. Zaproponowano metodykę obliczania estymatorów diagnostycznych z przetworzonych za pomocą transformat STFT, CWT, WVD sygnałów drganiowych. Wyznaczone miary stanu technicznego amortyzatora wykazały czułość na analizowane uszkodzenia.

The paper presents new method of passenger cars shock-absorbers diagnosis. It were proposed technical condition estimators based on STFT, CWT, WVD analysis of vibration signals analytical algorithm. Determined shock-absorber technical condition measures show simulations defects sensitivity.