ヴィグナー分布による衝突音の周波数解析

概要

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For the analysis of nonstationary signals and time-varying signals such as impact sound, the use of a discrete pseudo-Wigner distribution (WD) is particularly suitable. Review of its mathematical properties indicates that its expression is suitable to represent the signal simultaneously in the time and frequency domains. In order to compute the WD, digital signal processing is necessary. WD for digital processing can be carried out simply by adapting the fast Fourier transform algorithm. Analyzing several types of time-varying transient acoustic signals by means of the WD, we can illustrate their dynamic features jointly in time and frequency representation. Especially for the sandwich steel sheet, the damping characteristic of the signal can be clearly represented in the time-frequency domain.
社団法人日本機械学会の論文
1989-12-25