腭裂语音治疗中腭咽阻塞器对鼻化元音的影响

①目的分析腭裂语音非手术治疗病理性语音频谱特点，评价腭咽阻塞器对腭裂语音中鼻化元音作用。②方法用语音频谱分析系统对10例健康儿童、30例腭裂术前病人、30例腭裂术后病人及15例用腭咽阻塞器的腭裂术后病人的鼻化元音进行检查，对其单元音共振峰和额外共振峰频谱特点进行分析。③结果[a]音Fn频率和振幅腭咽阻塞器组与腭裂术后组有显著差异（F=7．86、5．44，q=3．65～5．26，P〈0．05）．[i]音F1振幅腭咽阻塞器组减弱，与术前、术后及正常对照组均有显著差别（F=5．44，q=3．65～4．29，P〈0．05）。④结论通过对鼻化元音的共振峰及额外峰的频谱分析，可以了解戴腭咽阻塞器后鼻音化程度下降的情况；可以判断腭裂病人手术前后及戴用腭咽阻塞器后的语音效果。

EFFECT OF OBTURATOR ON NASALISED VOWELS IN SPEECH THERAPY OF CLEFT PALATE

Objective To analyze the spectrum features of nasalized vowels after the obturator application and to assess its value. Methods The acoustic features of amplitude of the vowels [a],[i],the extra formant and amplitude of 10 healthy children(control group),30 patients with cleft palate(pre-operative group),30 patients with cleft palate after operation(post-operative group) and 15 patients after obturator speech therapy(obturator group) were studied by spectrography.The mean value of the amplitude(An,A1 of [i]) and frequency of extra formant(Fn) were analyzed. Results Fn and An of [a] were lower in obturator group and control group than those of pre-operative group and post-operative group.A1 of decreased in the obturator group compared with the pre-and post-operative groups. Conclusion According to the analysis of formants,extra formant of vowels,nasalized vowels decrease and the condition of velopharyngeal competence(VPC) is improved.