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1. compute audio file THD+N value compute audio file THD+N value

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   # please refer https://gist.github.com/endolith/246092

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   from __future__ import division

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   import sys

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   from scipy.signal import blackmanharris

2. compute coherence with wave compute coherence with wave

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   from scipy import signal

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   import matplotlib.pyplot as plt

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   import numpy as np

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   import scipy.io.wavfile as wav

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