We choose wavelet and wavelet packet because wavelet transform (WT) itself has the character of multiresolution.

• 之所以选择小波和小波包变换是因为小波变换本身就是多分辨率的，这使得它比那些固定分辨率的变换，比如STFT(短时傅立叶变换)更加适合人类的生理声学模型。