Objective Quality Measures for Glottal Inverse Filtering of Speech Pressure Signals
Tom Bäckström, Matti Airas, Laura Lehto, Paavo Alku · 2006
Glottal inverse filtering is a process where the effects of the vocal tract are cancelled from the speech signal in order to estimate the voice source. Traditionally, inverse filtering methods have involved a high level of manual tuning of parameters, such as the vocal tract model order. We present objective heuristics for the measurement of the quality of the resulting glottal flow estimate. In addition, we propose an automatic method for determining the order of the vocal tract all-pole model in inverse filtering based on phase-plane analysis and estimation of the glottal flow kurtosis.