波形图的基本信息

>>> import librosa
>>> import librosa.display
>>> # Load a wav file
>>> y, sr = librosa.load(r‘C:\Users\guini\Desktop\rain.wav‘, sr=None)
>>> # extract mel spectrogram feature
>>> melspec = librosa.feature.melspectrogram(y, sr, n_fft=1024, hop_length=512, n_mels=128)
>>> # convert to log scale
>>> logmelspec = librosa.power_to_db(melspec)
>>> plt.figure()
>>> # plot a wavform
>>> plt.subplot(2, 1, 1)
>>> librosa.display.waveplot(y, sr)
>>> plt.title(‘rain wavform‘)
>>> # plot mel spectrogram
>>> plt.subplot(2, 1, 2)
>>> librosa.display.specshow(logmelspec, sr=sr, x_axis=‘time‘, y_axis=‘mel‘)
>>> plt.title(‘Mel spectrogram‘)
>>> plt.tight_layout() #保证图不重叠
>>> plt.show()