Choi-Williams Time-frequency Analysis Of
Forearm Flexors Mechanomyogram Acquired
From A Laser Diode Sensor Based Probe
Author(s)
S. Mekaoui, K. Ghoumid & T. Gharbi
Abstract
The aim of this paper is to show how time-frequency plane can be used to
directly read the frequency contents of forearm flexors muscles vibrations
actually called MMG signals (Mechanomyogram). The MMG signals under
scope are acquired from a laser diode sensor based probe connected to precise
interface acquisition cards and the acquired signals are put into the memory of a
PC for further analysis. The time-frequency technique used is the Choi-Williams
energy distribution which belongs to the well reputed Cohen’s class and satisfies
many very useful properties especially in its 3D version. With this technique a
good compromise between time and frequency resolution can be found. The 3D
spectrograms displayed from the data acquired from few normal subjects and
patients with specific muscle disorders are compared. This analysis method
revealed an efficient localization of the MMG most significant frequencies.
Keywords: MMG signals (Mechanomyogram), optical laser diode sensor,
time-frequency analysis, Choi-Williams distribution, Morlet Wavelet
Scalograms.
1 Introduction
Nowadays, a considerable progress has been performed in developing various
methods for the acquisition and analysis of MMG signal (Mechanomyogram). In
Keywords
MMG signals (Mechanomyogram), optical laser diode sensor,
time-frequency analysis, Choi-Williams distribution, Morlet Wavelet
Scalograms.
Related Book
Other papers in this volume
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