基于小波变换的基音同步叠加技术  

A Scheme for Pitch Synchronous Overlap Add Based on Wavelet Transform

作　　者：刘轶[1] 王长富[1] 戴蓓倩[1] 

机构地区：[1]中国科学技术大学电子技术部

出　　处：《中国科学技术大学学报》1998年第4期470-475,共6页JUSTC

基　　金：国家自然科学基金

摘　　要：针对传统的基音同步叠加方法的缺陷提出了相应的改进方法：一是将小波变换用于声门闭合时刻（ＧＣＩ）的检测，获得ＧＣＩ的准确位置，在此基础上，按每个基音周期起始的精确位置进行基音同步叠加，在一定的范围内，改变单音节的基频和时长去拟合连续语流中音节的超音段变化；二是用升余弦滚降窗函数代替基音同步叠加算法中的Ｈａｍｍｉｎｇ窗函数，使合成语音的质量明显提高，调节更加方便．In order to overcome the shortage of traditional Pitch synchronous overlap add method, some new methods for improvment are proposed in this paper. First, Wavelet Transform to is used detect the glottal closure instant (GCI), so that the accurate location of GCI can be obtained. Using the GCI information, the fundamental frequency and the speech duration of a monosyllable are modified in the definitive ranges to fit the varies of the syllable in natural continuous speech. Then, Tukey window function is used in our PSOLA method to take the place of Hamming window function. Thanks to these methods, the quality of synthesized speech is greatly improved.

关 键 词：小波变换 基音同步叠加 语音合成 

分 类 号：TN912.33[电子电信—通信与信息系统]