对输入的语音信号进行分帧处理，低通滤波，中心削波，求自相关函数最后得到基音轨迹。-Speech input signal framing processing, low-pass filtering, center clipping, seeking autocorrelation function finally got the pitch trajectory.

给定连续20帧的语音信号，此算法实现其LSF轨迹图。-Given a continuous 20-frame speech signal, this algorithm implements its LSF trajectory