A simple method of analysing dynamic processes during pulse propagation is described. A change in duration of pulses and interpulse intervals in the course of propagation is taken into consideration. It is shown that due to inhomogeneity the excitation fronts are grouped into peculiar "cluster" moving at a low rate. It is also indicated that after passing the "cluster", the influence of inhomogeneity upon the form of the propagating consequence of pulses is essentially weakened.
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