Description: calculated ARMA (p, q) model of the power spectral density.- Participation : b-- double-precision real one-dimensional arrays, length (q 1), storage ARMA (p, q) model of the average coefficient of sliding. A-- double-precision real one-dimensional arrays, length (p 1), storage ARMA (p, q) model of regression coefficients. Q-- integer variables, ARMA (p, q) moving average model of order. P-- integer variables, ARMA (p, q) model of order since the reunification. Sigma2-- double precision real-type variables, ARMA (p, q) model white noise variance. Fs-- double precision real-type variables, sampling frequency (Hz). X-- double-precision real one-dimensional array, the length of len. When the sign = 0, storage power spectral density; When the sign = 1:00, storage decibel levels, said th
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