Modulation frequency and modulation level owing to vocal microtremor

Vocal microtremor designates a normal slow modulation of the vocal cycle lengths of speakers who do not suffer from pathological tremor of the limbs and whose voices are not perceived as tremulous. Vocal microtremor is therefore distinct from pathological vocal tremor. The objective is to report dat...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2002-08, Vol.112 (2), p.690-700
Main Author: Schoentgen, Jean
Format: Article
Language:English
Subjects:
Data Interpretation, Statistical
Female
Humans
Larynx - physiopathology
Male
Middle Aged
Reference Values
Sound Spectrography
Voice Disorders - diagnosis
Voice Disorders - etiology
Voice Disorders - physiopathology
Voice Quality
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Summary:Vocal microtremor designates a normal slow modulation of the vocal cycle lengths of speakers who do not suffer from pathological tremor of the limbs and whose voices are not perceived as tremulous. Vocal microtremor is therefore distinct from pathological vocal tremor. The objective is to report data about the modulation frequency and modulation level owing to vocal microtremor. The modulation data have been obtained for vowels [a], [i], and [u] sustained by normophonic and mildly dysphonic male and female speakers. The results are the following. First, modulation frequencies and relative modulation levels do not differ significantly for male and female speakers, normophonic and mildly dysphonic speakers, as well as for vowel timbres [a], [i], and [u]. Second, the typical interquartile intervals of the modulation frequency and modulation level are equal to 2.0-4.7 Hz and 0.4%-1.3%, respectively. Third, dissimilarities between data reported by different studies are due to different cutoff frequencies below which spectral peaks are considered not to contribute to vocal microtremor.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.1492820