采用自相关函数法求基音周期，将采样得到的声音信号按每20ms一帧分为若干帧，并对每帧的序列求自相关函数，取自相关函数第一个最大值点算出基音周期，并以帧为横坐标，基音周期为纵坐标画图，并去除野点，最后取图中浊音部分即面积较大部分的值作为基音周期。-Using the autocorrelation function method pitch period, the sound signal is sampled every 20ms fr a me is divided into a plurality of fr a mes, and each fr a me sequence　uates the autocorrelation function, taken　the first maximum point of correlation function calculated　the pitch period, and fr a me as the horizontal, the vertical axis pitch drawing and remove outliers, and finally take the value of the area that is part of a larger portion of the figure as voiced pitch.