Problems of allocation of a useful signal are considered by search of people who as a result of an emergency situation appeared in the closed volume (in blockages), against the acoustic hindrances created by environment. The simplified model of a useful signal is given. It is shown that at the solution of a problem of identification of signals from biological system for identification of nonlinear communication the good effect can give use of polyspectral characteristics of signals.
acoustic energy, hyperbolic symmetry, infrasonic frequencies, Fourier's spectral characteristics, Mellin's spectral characteristics, monospectral analysis, polyspectral analysis
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