If the wavelet transform is directly implemented in pitch detection, comparing the glottal closure singularity of speech signal with image grey break, we will not obtain the anticipative result.
将声门闭合在语音信号中表现出相应的奇异性，与图像边缘的灰阶突变进行等价对比，直接将小波变换用于声门闭合奇异型的检测，并不会得到预期效果。
参考来源 - 小波分析应用于语音信号的基音周期检测·2,447,543篇论文数据，部分数据来源于NoteExpress
声带麻痹和喉肌力弱均会使声门闭合不良，而造成声音嘶哑。
Incomplete closure of the glottis with hoarseness of voice is usually caused by vocal cord paralysis and weakness of laryngeal muscles of phonation.
结论：元音不同，声门闭合度存在差异，进而影响声学测试的参数。
Vowels have something to do with glottal closure, therefore influence acoustical measures.
于是从语音产生模型入手，详细的分析了声门闭合时刻语音信号的性质，找到了浊音信号经过小波变换后周期性消失、极值点个数增多的原因。
Based on the speech produce model, we find the reason of periodicity disappearance and the extremum number increase by analysing the character of speech signal when the glottal closes.
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