Phase Estimation in speech enhancement
According to their model given by Eq. (2), voiced speech is assumed to consist of a weighted sum of sinusoids with frequencies that are multiples of the fundamental frequency. They assume that in each frequency band $k$ there is one dominant harmonic with normalized angular frequency $\Omega_h^k$, which is the harmonic that is closest to the frequency corresponding to the $k^{th}$ frequency bin of the FFT. The frequency of this harmonic is used to estimate the current phase in band $k$ from the previous phase value in that band according to Eq. (3).