音频 特征提取：①幅度谱（短时傅里叶变换谱stft）、②梅尔频谱（mel Spectrogram）、③梅尔倒谱（mfcc）【在梅尔频谱上取

音频 特征提取：①幅度谱（短时傅里叶变换谱stft）、②梅尔频谱（mel Spectrogram）、③梅尔倒谱（mfcc）【在梅尔频谱上取
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