摘要
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．
The accurate estimation of the glottal closure instants(GCI) is carried out by detecting the position of local maximum in the wavelet transform of speech signals, and the interval between two adjacent GCI's is defined as one pitch period, whose reciprocal is the fundamental frequency F0. The experimental results show that the proposed method can not only detect fairly accurate pitch period,exhibit the rapid change in pitch period contours,but also have robustness to noise and give reliable determination of voiced/unvoiced sounds.
基金
国家自然科学基金
关键词
基音周期
小波变换
声门闭合时刻
语音信号处理
pitch period extraction,wavelet transform,estimation of glottal closure instants,nonstationary pitch period variation
