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Jean-Marc Valin 2018-06-21 20:45:54 -04:00
commit c41afe41f0
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dnn/ulaw.py Normal file
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import numpy as np
import math
def ulaw2lin(u):
return (math.exp(u/128*math.log(256))-1)/255
def lin2ulaw(x):
s = np.sign(x)
x = np.abs(x)
u = (s*(128*np.log(1+255*x)/math.log(256)))
u = np.round(u)
return u.astype('int16')