A comparison study on the Wigner and Choi-Williams distributions for detection

Griffin, C.

doi:10.1109/icassp.1991.150726

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…But, its limitation-due to the windowing of data-occurs and manifests a leakage in the spectral domain. When high time and frequency resolution is needed, the Wigner-Ville or the Choi-Williams distributions are preferred [10,11,21,22,26,27]. This is performed by mapping a one dimensional signal in the time domain, into a two dimensional time-frequency representation of the signal.…”

Section: Experimental Set Up and Analysismentioning

confidence: 99%

Reduction of commercial aircraft noise emission around airports. A new environmental challenge

Khardi¹

2009

Eur. Transp. Res. Rev.

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Noise abatement procedures (NAPs) are considered as a necessary measure for a balanced approach of noise control around airports. Their correct implementation depends upon many factors, which vary in operation and influence the efficiency of the NAPs. Any system, which defines the correct features of the NAPs for particular aircraft in specific conditions, would be useful for noise control. Thus, implementation of noise level monitoring systems, currently used around airports, gives a noise map in residential areas but cannot identify source frequencies and their impact on the environment. Consequently, this paper has been produced particularly to characterize the frequential aspect of aircraft noise emission. Its main objective is the analysis of the dominant frequencies emitted during approaches to the Lyon Saint-Exupéry International Airport (France) having a negative impact on the population living around this airport. Thus, the results obtained make it possible to show, through an empirical model of aircraft noise, the effectiveness of this experimental work.

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Section: Experimental Set Up and Analysismentioning

confidence: 99%

Reduction of commercial aircraft noise emission around airports. A new environmental challenge

Khardi¹

2009

Eur. Transp. Res. Rev.

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“…This is an inherent characteristic of the wavelet analysis [10]. On the other hand, the quadratic (Cohen's class) time-frequency distributions are based on estimation of instantaneous energy using bilinear operation on the signal [12]. Among the most commonly used timefrequency distributions from Cohen's class are Wigner-Ville Distribution (WVD), Choi-Williams Distribution (CWD), and Zhao-Atlas Marks (ZAM) Distribution [5,6,8].…”

Section: Introductionmentioning

confidence: 99%

Time-Frequency Analysis of Clinical Percussion Signals Using Matrix Pencil Method

Bhuiyan

Malyarenko²,

Pantea

et al. 2015

Journal of Electrical and Computer Engineering

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This paper discusses time-frequency analysis of clinical percussion signals produced by tapping over human chest or abdomen with a neurological hammer and recorded with an air microphone. The analysis of short, highly damped percussion signals using conventional time-frequency distributions (TFDs) meets certain difficulties, such as poor time-frequency localization, cross terms, and masking of the lower energy features by the higher energy ones. The above shortcomings lead to inaccurate and ambiguous representation of the signal behavior in the time-frequency plane. This work describes an attempt to construct a TF representation specifically tailored to clinical percussion signals to achieve better resolution of individual components corresponding to physical oscillation modes. Matrix Pencil Method (MPM) is used to decompose the signal into a set of exponentially damped sinusoids, which are then plotted in the time-frequency plane. Such representation provides better visualization of the signal structure than the commonly used frequency-amplitude plots and facilitates tracking subtle changes in the signal for diagnostic purposes. The performance of our approach has been verified on both ideal and real percussion signals. The MPM-based time-frequency analysis appears to be a better choice for clinical percussion signals than conventional TFDs, while its ability to visualize damping has immediate practical applications.

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