Abstract
Voice source differences between the female chest and middle registers were analysed in flow glottograms, obtained by inverse filtering, from 11 females, all untrained in singing. The subjects sang ascending scales on the syllables [pæ:] in soft, middle and loud voice. Subglottal pressure was estimated from the oral pressures during the p-occlusions. A panel of voice experts identified register transitions in recordings of these scales and the most obvious examples of register transitions were analysed. At the register transition the closed quotient decreased almost consistently and the level difference between the two lowest source spectrum partials tended to increase. Subglottal pressure, glottal compliance, peak-to-peak amplitude, and glottal minimum flow did not change consistently across the register boundary.
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