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Diffstat (limited to 'python/demos/demo_simple_spectral_weighting.py')
-rwxr-xr-x | python/demos/demo_simple_spectral_weighting.py | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/python/demos/demo_simple_spectral_weighting.py b/python/demos/demo_simple_spectral_weighting.py new file mode 100755 index 0000000..dd4abbe --- /dev/null +++ b/python/demos/demo_simple_spectral_weighting.py @@ -0,0 +1,56 @@ +#! /usr/bin/env python + +import sys +from aubio import source, sink, pvoc +from numpy import arange, exp, hstack, zeros, cos +from math import pi + +def gauss(size): + return exp(- 1.0 / (size * size) * pow(2.0* arange(size) - 1. *size, 2.)); + +def hanningz(size): + return 0.5 * (1. - cos(2.*pi*arange(size) / size)) + +if __name__ == '__main__': + if len(sys.argv) < 2: + print('usage: %s <inputfile> <outputfile>' % sys.argv[0]) + sys.exit(1) + samplerate = 0 + if len(sys.argv) > 3: samplerate = int(sys.argv[3]) + f = source(sys.argv[1], samplerate, 256) + samplerate = f.samplerate + g = sink(sys.argv[2], samplerate) + + win_s = 512 # fft size + hop_s = win_s // 2 # hop size + pv = pvoc(win_s, hop_s) # phase vocoder + + # spectral weighting vector + spec_weight = hstack ( [ + .8 * hanningz(80)[40:], + zeros( 50 ), + 1.3 * hanningz(100), + zeros (win_s // 2 + 1 - 40 - 50 - 100), + ] ) + + if 0: + from pylab import plot, show + plot(spec_weight) + show() + + total_frames, read = 0, hop_s + while read: + # get new samples + samples, read = f() + # compute spectrum + spectrum = pv(samples) + # apply weight to spectral amplitudes + spectrum.norm *= spec_weight + # resynthesise modified samples + new_samples = pv.rdo(spectrum) + # write to output + g(new_samples, read) + total_frames += read + + duration = total_frames / float(samplerate) + print("read {:.3f}s from {:s}".format(duration, f.uri)) |