中文说明：
MFCC：Mel频率倒谱系数的缩写。Mel频率是基于人耳听觉特性提出来的，它与Hz频率成非线性对应关系。Mel频率倒谱系数（MFCC）则是利用它们之间的这种关系，计算得到的Hz频谱特征。
English Description：
MFCC: abbreviation of Mel frequency cepstrum coefficient. Mel frequency is proposed based on the auditory characteristics of human ear. It has a nonlinear relationship with Hz frequency. Mel frequency cepstrum coefficient (MFCC) is the frequency spectrum characteristics calculated by using the relationship between them.