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librosa音频处理教程
2022-07-06 06:43:00 【andrew P】
语音特征提取: 看懂梅尔语谱图(Mel-spectrogram)、梅尔倒频系数(MFCCs)的原理_BeichenLiu.Polaris的博客-CSDN博客_梅尔谱图
1.librosa.core.load(path,sr)对音频进行重新采样
librosa.core.load — librosa 0.7.2 documentation
librosa .core。负载(路径, sr=22050,单声道=真,偏移量=0.0,持续时间=无, dtype =<class 'numpy.float32'>, res_type='kaiser_best') [资源]¶
将音频文件加载为浮点时间序列。
音频将自动重新采样到给定的速率(默认sr=22050)。
要保留文件的本机采样率,请使用sr=None。
2.librosa.stft(),短时傅里叶变换
librosa.core.stft — librosa 0.7.2 documentation
短时傅里叶变换 ( STFT )。[1](第 2 章)
STFT通过在短重叠窗口上计算离散傅里叶变换 (DFT) 来表示时频域中的信号。
此函数返回一个复值矩阵 D 使得
np.abs(D[f, t])是 帧t处频率 bin f的幅度,并且
np.angle(D[f, t])是频率 bin f 在帧t的相位。
整数t和f可以通过实用函数frames_to_sample和转换为物理单位fft_frequencies。
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