Moreover, the EMG detector, particularly if it is at the surface of the skin, collects signals from different motor units at a time which may generate interaction of different signals. EMG signal acquires noise while traveling through different tissues. Hence, the EMG signal is a complicated signal, which is controlled by the nervous system and is dependent on the anatomical and physiological properties of muscles. The nervous system always controls the muscle activity (contraction/relaxation). The EMG signal is a biomedical signal that measures electrical currents generated in muscles during its contraction representing neuromuscular activities. This signal is normally a function of time and is describable in terms of its amplitude, frequency and phase. Biomedical signal means a collective electrical signal acquired from any organ that represents a physical variable of interest.
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