In this paper, a novel framework based on a time-frequency (TF) approach is proposed for detection of murmurs from heart sound signal. First, a high-resolution TF algorithm, matching pursuit, was used to decompose each heart beat into a series of TF atoms selected from a redundant dictionary. Next, representative components of murmurs were identified by clustering the selected atoms of all the ...

The purpose of this paper is to review the work that has been done in the past years by various researchers in vibration based health and usage monitoring and to identify the principal features and signal-processing algorithm used to this purpose. The damage detection concepts and the signal analysis techniques will be reviewed and categorized. Latest advances in signal processing methodologies...

A comparison of linear and quadratic transform implementation on field programmable gate array (FPGA) is presented. Popular namely Stockwell Transform Smoothed Pseudo Wigner Ville Distribution (SPWVD) from Quadratic transforms considered for the FPGA. Both are coded in Verilog hardware description language (Verilog HDL). Complex calculations transformation performed by using CORDIC algorithm. F...

ABSTRACT. Research in time-frequency representations (TFRs) has often been directed towards determining how two-dimensional weighting kernels, which operate convolutionally on Wigner-Ville distributions, effect desired properties and trade-offs of the resulting representation. For example, a kernel with a diamond-shaped support region results in a spectrogram which has the well-known trade-off ...

Cardiovasculary diseases are affecting a constantly growing number of people. Due to this reason we are continously looking for new ways of investigations. The processing of the heart’s audio signals also belong to this category. Heart sound is an acoustic wave generated by the mechanical movement of the heart and blood. The sounds can be divided into normal heart sounds and heart murmurs. Murm...

In this paper, a wave propagation model is developed to investigate the wave propagation in fluid-filled steel pipe. Based on the Kennard shell equations the investigation is achieved under the conditions of coupling between the shell elastic acoustic field and the interior fluid acoustic field. Tests are conducted on fluid-filled pipeline blockage detection. An active acoustic source is used t...

AbstraciThe following is a presentation of echo detection techniques based on time-frequency signal analysis for the measuring of thickness in thin multilayer structures. These techniques are shown to provide high-resolution signal characterization in a time-frequency space, and good noise rejection performance. In particular, the Short-Time Fourier Transform, the Gabor expansion, the Cross-Amb...

The peak of the polynomial Wigner–Ville distribution (PWVD) has been recently proposed as an estimator of the instantaneous frequency (IF) for a monocomponent polynomial frequency modulated (FM) signal. In this paper, we evaluate the statistical performance of this estimator in the case of additive white Gaussian noise and provide an analytical expression for the variance. We show that for a gi...