In this paper, we substantiate the selection of informative features of helicopter and airplane acoustic signals for the problem of their recognition. We show that the most informative features are the samples of extrema of the power spectrum of input signals, which are non-centered random variables. Invariance of the informative features to the helicopter flight speed is ensured by adding the adaptation block to the block of selection of informative features, which is implemented as a tracking meter of the blade passing encounter frequency.
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