Created
April 18, 2015 16:55
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Display a mel-scaled power spectrogram using librosa
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# Mostly taken from: http://nbviewer.ipython.org/github/bmcfee/librosa/blob/master/examples/LibROSA%20demo.ipynb | |
import librosa | |
import matplotlib.pyplot as plt | |
# Load sound file | |
y, sr = librosa.load("filename.mp3") | |
# Let's make and display a mel-scaled power (energy-squared) spectrogram | |
S = librosa.feature.melspectrogram(y, sr=sr, n_mels=128) | |
# Convert to log scale (dB). We'll use the peak power as reference. | |
log_S = librosa.logamplitude(S, ref_power=np.max) | |
# Make a new figure | |
plt.figure(figsize=(12,4)) | |
# Display the spectrogram on a mel scale | |
# sample rate and hop length parameters are used to render the time axis | |
librosa.display.specshow(log_S, sr=sr, x_axis='time', y_axis='mel') | |
# Put a descriptive title on the plot | |
plt.title('mel power spectrogram') | |
# draw a color bar | |
plt.colorbar(format='%+02.0f dB') | |
# Make the figure layout compact | |
plt.tight_layout() |
Nice work. In v6.0, librosa.logamplitude(S, ref_power=np.max)
is replaced by librosa.amplitude_to_db(S, ref=np.max)
Nice work. In v6.0,
librosa.logamplitude(S, ref_power=np.max)
is replaced bylibrosa.amplitude_to_db(S, ref=np.max)
Thanks!!
Nice work. In v6.0,
librosa.logamplitude(S, ref_power=np.max)
is replaced bylibrosa.amplitude_to_db(S, ref=np.max)
you can also use librosa.amplitude.power_to_db(S, ref = np.max)
you also need import librosa.display
instead of import librosa
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Great tutorial. You're forgetting
plot.show()
.