On the use of instantaneous complex frequency for pitch and formant tracking

In the paper a method for pitch and formant tracking using instantaneous complex frequency (ICF) is presented. It includes estimating the frequencies, as well as the bandwidths of the speech formants. The formants are separated from the speech signal using complex passband Hilbert filters. The filters are simultaneously used to compute the Hilbertian signal in order to calculate the ICF of each formant. Moreover, the filters automatically adapt to the changing pitch of the analyzed speech signal.