python/demos/demo_filterbank_slaney.py

   1 #! /usr/bin/env python
   2
   3 from aubio import filterbank
   4 from numpy import arange, vstack
   5
   6 win_s = 8192
   7 samplerate = 16000
   8
   9 f = filterbank(40, win_s)
  10 f.set_mel_coeffs_slaney(samplerate)
  11
  12 from pylab import loglog, title, show, xlim, ylim, xlabel, ylabel
  13 xlim([0,samplerate / 2])
  14 times = vstack([arange(win_s // 2 + 1) * samplerate / win_s] * 40)
  15 loglog(times.T, f.get_coeffs().T, '.-')
  16 title('Mel frequency bands coefficients')
  17 xlim([100, 7500])
  18 ylim([1.0e-3, 2.0e-2])
  19 xlabel('Frequency (Hz)')
  20 ylabel('Amplitude')
  21 show()