N2 - 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 Brüel & 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. L1 - http://www.czasopisma.pan.pl/Content/101465/PDF/09_paper.pdf L2 - http://www.czasopisma.pan.pl/Content/101465 PY - 2014 IS - No 3 EP - 394 DO - 10.2478/aoa-2014-0042 KW - modal analysis KW - Short-Time Fourier Transform KW - wavelet transform KW - acoustic signal processing A1 - Błażejewski, Andrzej A1 - Kozioł, Piotr A1 - Łuczak, Maciej PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 39 DA - 2014 T1 - Acoustical Analysis of Enclosure as Initial Approach to Vehicle Induced Noise Analysis Comparatevely Using STFT and Wavelets SP - 385 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/101465 T2 - Archives of Acoustics