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. In this article, 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 phaseplane analysis and estimation of the glottal flow kurtosis.
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