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Diffstat (limited to 'python/demos/demo_filterbank.py')
-rwxr-xr-x | python/demos/demo_filterbank.py | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/python/demos/demo_filterbank.py b/python/demos/demo_filterbank.py new file mode 100755 index 0000000..54aff57 --- /dev/null +++ b/python/demos/demo_filterbank.py @@ -0,0 +1,30 @@ +#! /usr/bin/env python + +from aubio import filterbank, fvec +from pylab import loglog, show, xlim, ylim, xlabel, ylabel, title +from numpy import vstack, arange + +win_s = 2048 +samplerate = 48000 + +freq_list = [60, 80, 200, 400, 800, 1600, 3200, 6400, 12800, 24000] +n_filters = len(freq_list) - 2 + +f = filterbank(n_filters, win_s) +freqs = fvec(freq_list) +f.set_triangle_bands(freqs, samplerate) + +coeffs = f.get_coeffs() +coeffs[4] *= 5. + +f.set_coeffs(coeffs) + +times = vstack([arange(win_s // 2 + 1) * samplerate / win_s] * n_filters) +title('Bank of filters built using a simple list of boundaries\nThe middle band has been amplified by 2.') +loglog(times.T, f.get_coeffs().T, '.-') +xlim([50, samplerate/2]) +ylim([1.0e-6, 2.0e-2]) +xlabel('log frequency (Hz)') +ylabel('log amplitude') + +show() |