Abstract
The purpose of this study was to examine the relationship between spectral characteristics and the perceptual evaluation of hypernasality in speakers with cleft palate. Speech samples from 32 cleft palate patients (average age 9.3 years) and 5 normal subjects (average age 9.4 years) were used in this study. The isolated vowel /i/ produced by each subject was filtered using 16 one-third octave bandpass filters from 200 Hz to 6.3 kHz to obtain a 1/3 octave spectrum. These spectra were normalized using the total power level of the 16 1/3 octave bands. Three sophisticated listeners rated the speech samples using a six-point equal-appearing interval scale. Average spectra obtained from the hypernasal and the normal groups were compared. Spectral characteristics of hypernasality in the vowel /i/ were identified as a rise in power level between the first formant (F1) and the second formant (F2) and a rise in power level of F1. Multiple regression analysis revealed a high correlation (r=0.81) between the averaged perceptual scores and four levels of 1/3 octave bands: the band containing F1, the first, the second, and the fourth bands from F1. [Work supported by NIDR Grant Nos. DE07105 and DE06957.]
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