用经验模式分解分解出固有模式函数，从而得出瞬时频率和包络，适合进行特征提取-using empirical mode decomposition decomposition patterns inherent function, thereby reaching and instantaneous frequency envelope, suitable for feature extraction

一部分希尔伯特-黄变换HHT的经验模式分解EMD程序-Hilbert huang transform (HHT- a part of the empirical mode decomposition EMD program,,