A large sample of vowels produced by male and female speakers were inverse filtered and parameterized using 21 different glottal flow parameters. The performance of the different parameters in expression of the phonation type was then tested using objective statistical methods. The comparison of the results revealed marked differences in the parameters ’ performance, and therefore, guidelines for parameter use and comparison were established. Index Terms: voice quality, phonation type, inverse filtering, voice source, parameterization

Emotions in short vowel segments of continuous speech were analysed using inverse filtering and a recently developed glottal flow parameter, the normalised amplitude quotient (NAQ). Simulated emotion portrayals were produced by 9 professional stage actors. Separated /a: / vowel segments were inverse filtered and parameterised using NAQ. Statistical analyses showed significant differences among most of the emotions studied. Results also demonstrated clear gender differences. Inverse filtering, together with NAQ, was shown to be a promising method for the analysis of emotional content in continuous speech. Copyright © 2006 S. Karger AG, Basel 1

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Voice quality, defined by John Laver as the characteristic auditory colouring of a speaker’s voice, is a significant feature of speech, and it is used to signal various properties such as emotions, intentions, and mood of the speaker. While voice quality measurement techniques and algorithms have been developed, much work is needed to obtain a comprehensive view of the function and analysis of human voice in the production of different voice qualities. Two major research questions are presented in this thesis: First, how can the most important laryngeal voice quality features be analyzed, and second, how do the voice quality features affect different facets of vocal expression? To answer these questions, five separate studies of the analysis methodology and two studies regarding the voice quality behaviour were