Title: Control of Fundamental Frequency, Intensity and Voice Quality in Speech Running Title: Control of F0, Il and Voice Quality

In this paper the control of fundamental frequency (F0), intensity level of the radiated acoustic signal (IL), and voice quality is studied in normal conversational speech. It is shown that the physiological fac tors that best explain measured features of the speech wave depend on the part of the utterance taken into account. Also, it appears that in speech transglottal pressure (Ptr) is more important than subglottal pressure (Psb). We conclude that currently available mathematical models that describe the waveform of glottal volume flow (Ug) lack a number of parameters necessary for a better understanding of the physiological con trol of the speech parameters investigated in this study.