Johan Liljencrants

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A g l o t t a l flow model with four independent parameters is described: I t is r e f e r r e d t o as t h e LF-model. Three o f t h e s e p e r t a i n to the frequency, amplitude, and the exponential growth constant of a sinusoid. The fourth parameter is the time constant of an exponential recovery, i.e., r e t u r n phase, from t h e po in t of maximum(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)
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)
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)
Modelling of the glottal airflow has been performed with two different methods. One is with a frequency domain analog synthesizer, FLEA. The special aim of that study by Båvegård and Fant (1994a, 1994b) was to quantify and verify the interaction ripple on the flow, which is caused by the oral and tracheal loads when glottis is regarded as an oscillator. In(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 set-up and describe possible solutions considered. The system(More)
The main body of our study derives from the processing of 5 subjects’ reading of a corpus from a Swedish novel. Two of the subjects were females. Intonation contours on a log frequency scale have been sampled and normalised to eliminate differences in mean tonal level and duration. As a result, intonation patterns across speakers are brought out revealing(More)