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VOICING AND SILENCE PERIODS IN DAILY AND WEEKLY VOCALIZATIONS OF TEACHERS
Journal article   Peer reviewed

VOICING AND SILENCE PERIODS IN DAILY AND WEEKLY VOCALIZATIONS OF TEACHERS

Ingo R. Titze, Eric J. Hunter and Jan G. Švec
The Journal of the Acoustical Society of America, Vol.121(1), pp.469-478
01/01/2007
DOI: 10.1121/1.2390676
PMCID: PMC6371399
PMID: 17297801
url
https://www.ncbi.nlm.nih.gov/pmc/articles/6371399View
Open Access

Abstract

The National Center for Voice and Speech (NCVS) data bank on voice dosimetry was used to study the distributions of continuous voicing periods and silence periods in 31 teachers over the duration of two weeks. Recordings were made during all awake hours of the day. Voicing periods were grouped into half-decades, ranging from 0.0316 – 0.10 s for the shortest periods of phonation to 31.6 – 100 s for the longest periods of phonation. Silence periods were grouped into similar half-decades, but ranged up to periods of several hours. On average, the teachers had 1800 occurrences of voicing (onset followed by offset) per hour at work and 1200 occurrences per hour while not at work. Voicing occurred 23% of the total time at work, dropping to 13% during off-work hours and 12% on weekends. The greatest accumulation of voicing occurred in the 0.316 – 1.0 s voicing periods, whereas the greatest accumulation of silence occurred in the 3 – 10 s silence periods. The study begins to lay the groundwork for understanding vocal fatigue in terms of repetitive motion and collision of tissue, as well as recovery from such mechanical stress.
 43.70.Bk 43.70.Fq 43.70.Jt occupational voice use phonation vocal fatigue vocal vibration dose

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