Japan Journal of Logopedics and Phoniatrics, Vol. 35, No. 2, pp. 199-206, 1994 (in Japanese)
A quantitative evaluation of hypernasality in children: Using the slope of spectrum envelope
S. Hirai, K. Okazaki and T. Arai
Abstract: This study investigated the acoustical characteristics of hypernasality in childres for a quantitative evaluation. The subjects consisted of an experimental group of 39 children with repaired cleft lips or palates and congenital velopharyngeal incompetence, and a control group of 152 normal children. Ages ranged from 4 to 8. Thematerials consisted of 5 Japanese vowels Speech therapists were requested to make auditory evaluations of the utterances of the pathological group in terms of degree of hypernasality using three-level rating scale: severe, mild and absent. The isolated vowels /i/ uttered by the subjects were analyzed acoustically by cepstrum analysis.
Keywords: hypernasality, children, acoustic analysis