DETERMINATION OF THE EXACT PHASE OF THE BISPECTRUM

In this paper, we show that if the phase of the bispectrum correspondi ng to a nonminimum phase system has a 2k-pi change at some frequencies , which will not affect the value of the bispectrum, many algorithms p roposed for the phase reconstruction of the system transfer function f rom the bispectrum will give an erroneous result. To solve the problem , an algorithm that can suppress the effect of the 2k-pi phase change of the bispectrum is proposed. The difference between the reconstructe d phase by the algorithm and the original phase of the system can only be 2n-pi.