Acoustic differences between samples of [i], [u], and [a] uttered in nose-open and nose-obstructed condition were studied in 6 women with isolated cleft palate and pathological nasalance scores and 9 healthy women with normal nasalance scores. The speech samples were depicted by 14-component vocal tract area feature vectors obtained by linear prediction and the differences between the samples were studied with a self organized feature map. Each location on the map corresponds to a certain signal pattern, neighboring locations to similar patterns. The group of healthy subjects differed from the patients for the vowels [i] and [u] but not for [a]. In the patients the nose obstruction induced a significant change in the location of these vowel samples on the map. In healthy subjects no such changes were detected. The result agreed with perceived differences between the subjects.

Keywords:
Hypernasality, Cul-de-sac hypernasality test, Cul-de-sac resonance, Spectral pattern recognition, Neural networks
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© 1996 S. Karger AG, Basel
1996
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