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KMID : 0917519980040020069
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Journal of Speech Sciences
1998 Volume.4 No. 2 p.69 ~ p.89
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The Speech of Cleft Palate Patients Using Nasometer, EPG and Computer based Speech Analysis System
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Abstract
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The aim of this study is to develop an objectively method of speech evaluation for children with cleft palates. To assess velopharyngeal function, Visi-Pitc, Computerized Speech Lab. (CSL), Nasometer and Palatometer were used for this study. Acoustic parameters were measured depending on the diagnostic instruments: Pitch (Hz), sound pressure leve (dB), jitter (%) and diadochokinetic rate by Visi-Pitch, VOT and vowels formant (F_1 & F_2) by a Spectrography and the degree of hypernasality by Nasometer. In addition, Palatometer was used to find the lingual-palatal patterns of cleft palate. Ten clildren with cleft palates and fifty normal children participated in the experiment.
The results are as follows: (1) Higher nasalance of children with cleft palates showed the resonance disorder. (2) The cleft palate showed palatal misarticulation and lateral misarticulatio on palatogram. (3) Children with cleft palates showed the phonatory and respiratory problems. The duration of sustained vowels in children with cleft palates was shorter than in the control groups. The pitch of children with cleft palates was higher than in the control groups. However, intensity, jitter and diadochokinetic rate of children with cleft palates were lower than in the control group. (4) On the spectrogram, the VOT of children with cleft palates was longer than control group. F_1 & F_2 were lower than in the control group.
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