The intelligibility of Dutch sentences in which specific vowels were systematically replaced by the Dutch vowel /oe/ was tested. The prosodic features of the vowels were copied to their substitute by using the TD-PSOLA technique. Plausibility of the sentences appeared to be the predominant factor in this experiment. Word frequency had only a small effect. For function words the number of correct responses was higher than for content words. A word stress effect could not be demonstrated.
Bibliographic reference. Laan, Gitta P. M. / Bergem, Dick R. van / Beinum, Fiorien J. Koopmans-van (1991): "The importance of spectral quality of vowels for the intelligibility of sentences", In EUROSPEECH-1991, 1129-1132.