Sixth International Conference on Spoken Language Processing (ICSLP 2000)

Beijing, China
October 16-20, 2000

Subglottal Pressure and Prosody in Swedish

Johan Liljencrants, Gunnar Fant, Anita Kruckenberg

Dept of Speech, music and hearing, KTH (Royal Institute of Technology), Stockholm, Sweden

One part of our study is concerned with modelling of the respiratory system. A phonetically trained speaker uttered a sequence of similar sentences differing in stress patterns. Suband supraglottal pressures and oral flow were measured and from these data stylized articulatory trajectories representing glottal and oral constrictions were derived. A simplified mass, spring, resistance equivalent circuit of the pulmonary system was adopted for an analysis-by-synthesis derivation of underlying pulmonary forces. These amount to simple binary onset and offset commands for breath group initiation and offsets and a set of superimposed gaussian shaped pressure pulses for modelling stress patterns. Glottal and supraglottal articulations impose a passively induced fine structure on a Psub contour. This production oriented modelling supports the findings in speech analysis.

A second object of our study was the reading of a one minute long passage from a novel with the respiratory pressures included in the recording. A special listening test was carried our to grade the relative prominence of each syllable. We thus had the opportunity to add both production and perception data to the speech analysis. Of special interest was studies of the covariation of subglottal pressure with F0 and their joint contribution to speech intensity measures. A general finding was that the subglottal pressure plays a role even at moderate stress level. It usually builds up to a maximum at the left boundary of a stressed syllable and decays with a rate that is positively correlated to the perceived prominence.


Full Paper

Bibliographic reference.  Liljencrants, Johan / Fant, Gunnar / Kruckenberg, Anita (2000): "Subglottal pressure and prosody in Swedish", In ICSLP-2000, vol.1, 1-4.