It is proposed to apply the wavelet transform to localize in time the frequen-cy components of the information signals in this article. The wavelet trans-form allows to fulfil time-frequency analysis of signals, which is very im-portant for studying the structure of a composite material from the mode composition of free oscillations. The proposed approach to the development of information signals using wavelet transform makes it possible to further study the nature of the occurrence of free oscillations and the propagation of acoustic waves in individual layers of composites and to study the change in the structure of composites from the changes in the three-dimensional wave-let spectrum.