[The study on the acoustic features of congenital velopharyngeal insufficiency in 28 patients].

OBJECTIVE To study the acoustic features of the patients with congenital velopharyngeal insufficiency (CVPI). METHODS The acoustic features of 28 patients with CVPI were analyzed with the computer speech lab, contrasted by the features of 20 controls. RESULTS There was significant difference in F2, B2, F3, B3 and VOT between the patients and the controls (P<0.05). It was not same on every syllable; From phonetic images, F1, F2 and F3 of the controls were more clear than those of the patients, the other districts of the controls were lighter than those of the patients. F1 of the patients was darker and broader, their F2 and F3 were lower, weaker and broader. Among F1, F2 and F3 of the patients, there were some extra FORMANTs. Erected stripes and fills before the vowel of the patients were fewer than those of the controls. CONCLUSION There were apparent distinctions in F2, B2, F3 and B3 between the patients and the controls, and there was significant difference in phonetic images of two groups, especially in FORMANTs, and consonants.