Development of diagnostic methods of lip motion and speech function in cleft lip and palate patients by applying a chaotic theory

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Using motion images captured from three infrared and one color digital video cameras, range images were produced. Homologous models of the lips were produced, and principal component analyses were then applied to the homologous models. Consequently, discriminate analyses suggested the possibility to distinguish motion during the phonation of/ u/ from that of other vowels.Next, fundamental frequencies(F0), frequencies of the first and second formant(F1, F2), and Lyapunov exponents(mLE1s) of cleft palate(CP) patients, jaw deformity patients and normal control were then calculated for five Japanese vowels. Consequently, the mLE1s for/ a/ both in males and females with CP were significantly higher than in normal individuals. Class III voice characteristics were observed in/ i/ of both males and females.