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Comparison of Two Inverse Filtering Methods in Parameterization of the Glottal Closing Phase Characteristics in Different Phonation Types
Authors:Laura Lehto  Matti Airas  Eva Bjrkner  Johan Sundberg  Paavo Alku
Institution:Laboratory of Acoustics and Audio Signal Processing, Helsinki University of Technology, Helsinki, Finland. laura.lehto@iki.fi
Abstract:SUMMARY: Inverse filtering (IF) is a common method used to estimate the source of voiced speech, the glottal flow. This investigation aims to compare two IF methods: one manual and the other semiautomatic. Glottal flows were estimated from speech pressure waveforms of six female and seven male subjects producing sustained vole /a/ in breathy, normal, and pressed phonation. The closing phase characteristics of the glottal pulse were parameterized using two time-based parameters: the closing quotient (C1Q) and the normalized amplitude quotient (NAQ). The information given by these two parameters indicates a strong correlation between the two IF methods. The results are encouraging in showing that the parameterization of the voice source in different speech sounds can be performed independently of the technique used for inverse filtering.
Keywords:Inverse filtering  Glottal flow  Closing quotient  Normalized amplitude quotient
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