


Calculates Bispectrum
[BISPEC] = bispec(Z,N);
Input: Z Signal
N % of coefficients
Output: BiACF bi-autocorrelation function = 3rd order cumulant
BISPEC Bi-spectrum
Reference(s):
C.L. Nikias and A.P. Petropulu 'Higher-Order Spectra Analysis' Prentice Hall, 1993.
M.B. Priestley, 'Non-linear and Non-stationary Time series Analysis', Academic Press, London, 1988.