title: The effect of sustained phonation at high and low pitch on vocal jitter and shimmer.
abstract: Looking for possible signs of vocal fatigue, acoustic waveform perturbation was measured in normal female subjects during sustained phonation at various fundamental frequencies (Fo). At none of the pitch levels a rise of the jitter or the shimmer was found after 25 min of vocalization. On the other hand, an effect of Fo was seen from the start: above the habitual speaking Fo of our subjects' voices there was a tendency for the jitter to be higher and for the shimmer to be lower.
authors.affiliation: Department of Logopedics, Hoger Technisch Instituut, Brugge, Belgium.
authors.forename: J
authors.initials: J
authors.lastname: Verstraete
authors.forename: G
authors.initials: G
authors.lastname: Forrez
authors.forename: P
authors.initials: P
authors.lastname: Mertens
authors.forename: F
authors.initials: F
authors.lastname: Debruyne
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008838:Microcomputers; D010699:Phonation / Q000502:physiology*; D012016:Reference Values; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation; D013018:Sound Spectrography; D014833:Voice Quality / Q000502:physiology*