Johan Liljencrants

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One aim of our study is to discuss some of the relations of prosodic parameters to the speech production process, e.g. how speech intensity is related to the vocal tract filter and the voice source and the underlying aerodynamics. A specific problem of phonetic interest is the role of subglottal pressure and fundamental frequency as intensity determinants(More)
Vocal tract area functions may contain quite abrupt changes in cross-sectional area. In formant frequency calculations for such area functions, an inner length correction (ILC) should be applied. The relevance of this correction was investigated by comparing acoustic measurements obtained from a physical model of the vocal tract with data gathered by means(More)
This paper describes experiences from the development of a Swedish spoken dialogue system with a talking agent, August. The system was exposed to the general public at a very early stage. Apart from describing the system and its components this paper discusses the problems encountered during the setup and describe possible solutions considered. The system(More)
Features of glottal flow are visualized by numerical simulation, using a Navier-Stokes solver for two-dimensional, incompressible flow. Four different shapes of glottal passages are examined, for comparison to stationary model measurements. Results include pressure distributions leading to the forces acting on the vocal folds and illustrate entry pressure(More)
This is a summary of studies of word and syllable prominence in Swedish performed during several years. A unique feature is the correlation of observed acoustic data with a continuously scaled parameter of perceived prominence. Besides the established parameters of duration, F0, intensity, and spectral tilt we have also data on true subglottal pressure.(More)