For accurate formant tracking, Linear Prediction (LP) and Fourier Transform (FT) analysis have some limitations. For the first, the limitation is the validity of the speech production model. For the second it is the limited time and frequency resolution. In this paper we focus on the improvment of - the FT using the reassignment technique. This method allows a much more accurate representation taking into account the phase of the FT. Comparison of this method with the normal FT and LP is carried out on Vowel-Vowel transitions, using respectively a pitch synchronous analyisis and a closed phase analysis. For the first case, the reassigned spectrum performs better than the LP, and slightly worse for the closed phase. In both conditions the results are significantly improved compared with the normal FT. The efficiency of the method with regard to the Formant definition is discussed.
Bibliographic reference. Plante, F. / Ainsworth, William A. (1995): "Formant tracking using reassigned spectrum", In EUROSPEECH-1995, 741-744.