def make_wave(self):
"""Transforms to the time domain.
returns: Wave
"""
N = len(self.hs)
ys = scipy.fftpack.idct(self.hs, type=2) / 2 / N
#NOTE: whatever the start time was, we lose it when
# we transform back
#ts = self.start + np.arange(len(ys)) / self.framerate
return Wave(ys, framerate=self.framerate)
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