ref: f8340e1cf44061891b4d45d8c835bd140ee46318
dir: /python/tests/test_phasevoc.py/
#! /usr/bin/env python
from numpy.testing import TestCase, assert_equal, assert_almost_equal
from aubio import fvec, cvec, pvoc
from numpy import array, shape
from numpy.random import random
precision = 6
class aubio_pvoc_test_case(TestCase):
""" pvoc object test case """
def test_members_automatic_sizes_default(self):
""" check object creation with default parameters """
f = pvoc()
assert_equal ([f.win_s, f.hop_s], [1024, 512])
def test_members_unnamed_params(self):
""" check object creation with unnamed parameters """
f = pvoc(2048, 128)
assert_equal ([f.win_s, f.hop_s], [2048, 128])
def test_members_named_params(self):
""" check object creation with named parameters """
f = pvoc(hop_s = 128, win_s = 2048)
assert_equal ([f.win_s, f.hop_s], [2048, 128])
def test_zeros(self):
""" check the resynthesis of zeros gives zeros """
win_s, hop_s = 1024, 256
f = pvoc (win_s, hop_s)
t = fvec (hop_s)
for time in range( 4 * win_s / hop_s ):
s = f(t)
r = f.rdo(s)
assert_equal ( array(t), 0)
assert_equal ( s.norm, 0)
assert_equal ( s.phas, 0)
assert_equal ( r, 0)
def test_resynth_two_steps(self):
""" check the resynthesis of steps is correct with 50% overlap """
hop_s = 512
buf_s = hop_s * 2
f = pvoc(buf_s, hop_s)
sigin = fvec(hop_s)
zeros = fvec(hop_s)
# negative step
sigin[20:50] = -.1
# positive step
sigin[100:200] = .1
s1 = f(sigin)
r1 = f.rdo(s1)
s2 = f(zeros)
r2 = f.rdo(s2)
#self.plot_this ( s2.norm.T )
assert_almost_equal ( r2, sigin, decimal = precision )
def test_resynth_three_steps(self):
""" check the resynthesis of steps is correct with 25% overlap """
hop_s = 16
buf_s = hop_s * 4
sigin = fvec(hop_s)
zeros = fvec(hop_s)
f = pvoc(buf_s, hop_s)
for i in xrange(hop_s):
sigin[i] = random() * 2. - 1.
t2 = f.rdo( f(sigin) )
t2 = f.rdo( f(zeros) )
t2 = f.rdo( f(zeros) )
t2 = f.rdo( f(zeros) )
assert_almost_equal( sigin, t2, decimal = precision )
def plot_this( self, this ):
from pylab import semilogy, show
semilogy ( this )
show ()
if __name__ == '__main__':
from unittest import main
main()