Fifth International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 2007)

Florence, Italy
December 13-15, 2007

Towards a Temporal High-Resolution Formant Analysis

Wolfgang Wokurek

Institut für Maschinelle Sprachverarbeitung, Universität Stuttgart, Germany

An attempt to analyse formant movements within the cycle of vocal fold vibration by linear prediction is presented. To achieve a high temporal resolution the duration of the analysis window is adjusted shorter than the fundamental period. The measurement noise increased thereby is counteracted by averaging the parameter estimates by clustering. Preprocessing by a linear band pass filter and by polynomial regression is discussed. The function of the method is demonstrated by analysing a synthetic formant with known resonance parameter contours. Then the method is applied to the first and second formant of the vowels [i:], [a:], and [u:] of a male speaker. The instantaneous formant and bandwidth contours and compared to the electroglottographic recorded contours of vocal fold tissue contact. An interpretation in terms of time varying acoustic coupling of the subglottal cavity through the larynx is proposed.
Index Terms. subglottal coupling, linear prediction, electroglottography

Full Paper (reprinted with permission from Firenze University Press)

Bibliographic reference.  Wokurek, Wolfgang (2007): "Towards a temporal high-resolution formant analysis", In MAVEBA-2007, 11-14.