python/demos/demo_simple_robot_voice.py

   1 #! /usr/bin/env python
   2
   3 import sys
   4 from aubio import source, sink, pvoc
   5
   6 if __name__ == '__main__':
   7     if len(sys.argv) < 2:
   8         print 'usage: %s <inputfile> <outputfile>' % sys.argv[0]
   9         sys.exit(1)
  10     samplerate = 44100
  11     f = source(sys.argv[1], samplerate, 256)
  12     g = sink(sys.argv[2], samplerate)
  13     total_frames, read = 0, 256
  14
  15     win_s = 512                          # fft size
  16     hop_s = win_s / 2                    # hop size
  17     pv = pvoc(win_s, hop_s)              # phase vocoder
  18
  19     while read:
  20         samples, read = f()
  21         spectrum = pv(samples)           # compute spectrum
  22         #spectrum.norm *= .8             # reduce amplitude a bit
  23         spectrum.phas[:] = 0.            # zero phase
  24         new_samples = pv.rdo(spectrum)   # compute modified samples
  25         g(new_samples, read)             # write to output
  26         total_frames += read
  27
  28     print "wrote", total_frames, "from", f.uri, "to", g.uri