Sixth International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 2009)

Florence, Italy
December 14-16, 2009

Tracking Formants, Extra-Formants and Anti-Formants in Non-Modal Speech by Means of a Spectral Pole-Zero Model

Jean Schoentgen (1,2), Francis Grenez (1)

(1) Dpt of Image and Signal Processing & Telecommunication Devices, Université Libre de Bruxelles, Brussels, Belgium
(2) National Fund for Scientific Research, Belgium

The presentation concerns a preliminary investigation of a spectral pole-zero model that is fitted directly to observed log-magnitude spectra. The parameters of pole-zero models are interpretable in terms of (anti-)formant frequencies and bandwidths that may thus be tracked over time. The speech corpus has comprised connected speech tokens with prominent formant/anti-formant pairs owing to hyper-nasality in many speech frames. Results show that the direct fitting of spectral models is feasible. The quality of fit of the spectral contour by a model transfer function is comparable to the quality of fit obtained via cepstral smoothing with an effective number of cepstral coefficients equal to the number of independent model parameters.

Index Terms. Spectral pole-zero models, formant and anti-formant tracking, hyper-nasality

Full Paper (reprinted with permission from Firenze University Press)

Bibliographic reference.  Schoentgen, Jean / Grenez, Francis (2009): "Tracking formants, extra-formants and anti-formants in non-modal speech by means of a spectral pole-zero model", In MAVEBA-2009, 87-90.