Kjell Gustafson

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The automatic derivation of word pronunciations from input text is a central task for any text-to-speech system. For general English text at least, this is often thought to be a solved problem, with manually-derived linguistic rules assumed capable of handling “novel” words missing from the system dictionary. Data-driven methods, based on machine learning(More)
This paper addresses the question of how children between the ages of nine and eleven perceive and respond to prosodic variation in speech synthesis. Prosodic features were varied in samples of both concatenative and formant synthesis. Children and an adult control group were asked to compare these samples and to evaluate which were the most fun and which(More)
Dictionary look-up is the primary strategy for deriving pronunciations for input words in a text-to-speech (TTS) system. This strategy is accurate for dictionary words, but it is not complete: it is impossible to list exhaustively all input words. The proper treatment of `unknown' words is currently an unsolved problem in TTS synthesis. There are many(More)
The current work deals with the modelling of one type of disfluency, hesitations. A perceptual experiment using speech synthesis was designed to evaluate two duration features found to be correlates to hesitation, pause duration and final lengthening. A variation of F0 slope before the hesitation was also included. The most important finding is that it is(More)
In our efforts to model spontaneous speech for use in, for example, spoken dialogue systems, a series of experiments have been conducted in order to investigate correlates to perceived hesitation. Previous work has shown that it is the total duration increase that is the valid cue rather than the contribution by either of the two factors pause duration and(More)
The main goal of our current research is the development of the Swedish prosody model. In our analysis of discourse and dialogue intonation we are exploiting model-based resynthesis. By comparing synthesized default and fine-tuned pitch contours for dialogues under study we are able to isolate relevant intonation patterns. This analysis of intonation is(More)