15th International Congress of Phonetic Sciences (ICPhS-15)
The present study examines the extent to which increased nasal coupling affects estimates of glottal parameters, when derived from inverse filtering based on an all-pole assumption of the vocal tract. The analysis involved synthesis of five steady-state vowels using the HLSYN quasi-articulatory synthesizer. For each vowel, the parameter controlling the nasal aperture, series An, was systematically varied from 0 to 100 mm2. The acoustic signal for each utterance was subsequently inverse filtered and estimates were made for a range of glottal source parameters. Preliminary results suggest that for most vowels, many of the source parameter estimates remain relatively unaffected by increased nasal coupling. However, for the high vowels (the high front vowel in particular) substantial changes in the source estimates were found in some of the source parameters with increasing degree of nasal coupling.
Bibliographic reference. Mahshie, James J. / Gobl, Christer (2003): "Estimating glottal parameters in nasalized speech: an analysis by synthesis", In ICPhS-15, 2193-2196.