Англо-русский словарь промышленной и научной лексики. 2014.
polyspectrum — noun A higher order spectrum of a multivariate stationary time series … Wiktionary
Bispectrum — In mathematics, in the area of statistical analysis, the bispectrum is a statistic used to search for nonlinear interactions. The Fourier transform of the second order cumulant, i.e., the autocorrelation function, is the traditional power… … Wikipedia
Bicoherence — In mathematics, in the area of statistical analysis, bicoherence is a squared normalised version of the bispectrum. The bicoherence takes values bounded between 0 and 1, which make it a convenient measure for quantifying the extent of phase… … Wikipedia
