Determination of the exact phase of the bispectrum

It is shown that if the phase of the bispectrum corresponding to a nonminimum phase system has a 2 kπ change at some frequencies, which will not affect the value of the bispectrum, many algorithms proposed for the phase reconstruction of the system transfer function from the bispectrum will give an erroneous result. To solve the problem, an algorithm that can suppress the effect of the 2 kπ phase change of the bispectrum is proposed. The difference between the phase reconstructed by the algorithm and the original phase of the system can only be 2 kπ