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Python Audio Libraries

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• Author: Diego Inácio
• GitHub: github.com/diegoinacio
• Notebook: audio_libraries.ipynb

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Brief overview about some of the main python libraries which promote input and output of digital audio files.

%matplotlib inline
import matplotlib.pyplot as plt
from IPython.display import Audio
import numpy as np

from _utils import *

1. Scipy

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Reading and writing audio files using SciPy.

1.1. Installation

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Install by command line:

>>> conda install scipy

or

>>> pip install scipy

1.2. Input

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from scipy.io import wavfile

%%time
try:
    fs, x_scipy = wavfile.read('../_data/A4_cello01.wav')
    x_scipy = x_scipy.astype(np.float32)
    x_scipy /= np.abs(x_scipy).max(axis=0)
except:
    print('Can not load audio!')

Wall time: 26 ms

audiovis(x_scipy, fs)

audio stereo

Audio(x_scipy.min(axis=1), rate=fs)

1.3. Analysis

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summary(x_scipy)

                          L               R
       min:         -0.9645         -0.9377
  1st Quar:         -0.2134         -0.1654
    median:         -0.0060         -0.0115
      mean:         -0.0017         -0.0016
  3rd Quar:          0.1955          0.1379
       max:          1.0000          1.0000
     sigma:          0.3149          0.2663

%%time
spectrogram(x_scipy, fs=fs, ws=2048)

audio stereo