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KMID : 0384019960070010050
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Journal of the Korean Society of Logopedics and Phoniatrics
1996 Volume.7 No. 1 p.50 ~ p.55
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The Study on Intraoral Pressure, Closure Duration and VOT During Phonation of Korean Bilabial Stop Consonants
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Abstract
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Acoustic analysis study was performed on 20 normal subjects by speaking nonsense syllables composed of Korean bilabial stops(/p, /p*, /ph/) and their preceding and/or following vowel /a/ (that is, [pa, p*a, apa, ap*;, apha]) with an
ultraminiature
pressure sensor in their mouths, Speech materials were phonated twice, once with a moderate voice, another time with a loud voice. The acoustic signal and intraoral pressure were recorded simultaneously on computer. By these procedures, we were
to
measure the intraoral pressure, closure duration and VOT of Korean bilabial stops, and to compare the values one another according to the intensity of phonation and the position of the target consonants. Intraoral pressure was measured by the
peak
intraoral pressure value of its wave : closure duration by the time interval between the onset of intraoral pressure build-up the burst meaning the release of closure : Voice onset time (VOT) by the time interval between the burst and the onset
of
glottal vibration.
Heavily aspirated bilabial stop consonant /ph/ showed the highest intraoral pressure value, unaspirated /p*/, the second, slightly aspirated /p/, the lowest. The syllable initial bilabial stops showed higher intraoral pressure than word initial
stops,
and the value of loudly phonated consonants were higher than moderate consonants. The longest closure duration period was that of /p*/ and the shortest, /p/, and the duration was longer in word initial position and in the moderate voice. In VOT,
the
order of the longest to shortest was /ph/, /p/, /p&/, and the value was shorter when the consonant was in intervocalic position and when it was phonated with loud voice.
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KEYWORD
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