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根据语音信号在声门闭合时刻（ＧＣＩ）的锐变特性，通过检测语音信号小波变换发生在ＧＣＩ附近的局部极大值的位置估计声门闭合时刻，两个相邻ＧＣＩ的距离为该段语音的基音周期，它的倒数即为基频Ｆ０．实验结果表明，采用本方法检测到的基音周期准确，能按基音周期及时反映它的迅速变化，且抗噪声性能强，还能可靠的判别清／浊音．
According to the sharpness of the glottal closure time (GCI) of the speech signal, the estimated glottal closure time is determined by detecting the location of the local maximum around the GCI of the speech signal wavelet transform. The distance between two adjacent GCIs is the speech of the segment Of the pitch period, which is the reciprocal of the fundamental frequency F0. The experimental results show that the pitch cycle detected by this method is accurate and it can reflect its rapid change according to the pitch cycle in time, and the anti-noise performance is strong, and the clear / voiced sound can be discriminated reliably.