Abstract
We consider propagation of intense acoustic beams having a noise temporal structure at the initial aperture. The evolution of the probability distribution and the wave spectrum at a discontinuous stage of propagation is studied experimentally when the field on the radiator axis represents a sequence of discontinuities with universal behavior between them. It has been shown, both theoretically and experimentally, that in this case the field spectrum retains its shape determined by the probability distribution of the frequency of the initial wave.
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