MFCCExtr：MFCC特征提取程序，常规MFCC（梅尔系数）特征
HFCCExtr：HFCC特征提取程序,在MFCC的框架下，去掉DCT，修改滤波器组，改用HFF滤波器，突出人声的特性，抑制乐器的声音
MFCC_walshExtr:音频HFCC特征提取程序,在MFCC的框架下,替换fft，改为walsh变换，抗噪性增强
PhilipsExtr：matlab程序，提取philips音频指纹
poryfly/AudioFeExtr
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音频特征提取程序，MFCC,HFCC,MFCC_WALSH，Philips
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