It is assumed in the paper that the signals in the enclosure in a transient period are similar to a
noise induced by vehicles, tracks, cars, etc. passing by. The components of such signals usually points out
specific dynamic processes running during the observation or measurements. In order to choose the best
method of analysis of these phenomena, an acoustic field in a closed space with a sound source inside is
created. Acoustic modes of this space influence the sound field. Analytically, the modal analyses describe
the above mentioned phenomena. The experimental measurements were conducted in the room that
might comprise the closed space with known boundary conditions and the sound source Br¨uel & Kjær
Omni-directional type 4292 inside. To record sound signals before the field’s steady state was reached,
the microphone type 4349 and the 4-channel frontend 3590 had been used. The obtained signals have
been analysed by using two approaches, i.e. Fourier and the wavelet analysis, with the emphasis on their
efficiency and the capability to recognise important details of the signal. The results obtained for the
enclosure might lead to the formulation of a methodology for an extended investigation of a rail track or
vehicles dynamics.
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