Readability Of Reassigned Scalograms And Extraction Of Spectra Features For Signal Analysis
Author(s)
S. Mekaoui, A. Houacine & T. Gharbi
Abstract
In this paper, wavelet scalogram is being used. The wavelet scalogram presents
some disadvantages. This is particularly true for time-frequency analysis and
representation which present inconvenient cross-terms. MMG signals (Mechanomyograms)
are acquired via a home probe high sensitive optical sensor. The data
obtained from 2 healthy subjects and 2 patients sat and tested under drastic
conditions are analyzed to characterize the dynamic properties of the MMG and
to determine their frequency contents as well. We developed the reassignment
form of the scalogram which improves its resolution and readability. A plot of
the scalogram contours is also presented to test the direct readability of the
scalogram representations. Spectra features are extracted and relevant parameters
are assessed such as the power spectral density, the mean frequency, the average
frequency and the well known ratio HF% that characterizes the dynamic
characteristics of the tested muscles. For that purpose, the number of subjects
had been increased to 24 healthy subjects and up to 18 patients affected by
different specific muscular diseases.
Keywords
MMG Signals (Mechano-myograms), Reassigned Wavelet Scalogram, power spectral density, mean and average frequencies, MMG rms value, MMG average value, HF % ratio value
Related Book
Other papers in this volume
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