Impact of duration on F1/F2 forma automatic analysis of large broadca and Germa

Formant values of oral vowels are automatically measured in a total of 50000 segments from four hours of journalistic broadcast speech in French and German. After automatic segmentation using the LIMSI speech alignment system, formant values are automatically extracted using PRAAT. Vowels with unlikely formant values are discarded (4%). The measured values are exposed with respect to segment duration and language identity. The gap between the measured mean Fi values and reference Fi values is inversely proportional to vowel duration: a tendency to reduction for vowels of short duration clearly emerges for both languages. These results are briefly discussed in terms of centralisation and coarticulation.