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| 1 | #! /usr/bin/python | ||
| 2 | |||
| 3 | from aubio import filterbank, fvec | ||
| 4 | from pylab import loglog, show, subplot, xlim, ylim, xlabel, ylabel, title | ||
| 5 | from numpy import vstack, arange | ||
| 6 | |||
| 7 | win_s = 2048 | ||
| 8 | samplerate = 48000 | ||
| 9 | |||
| 10 | freq_list = [60, 80, 200, 400, 800, 1600, 3200, 6400, 12800, 24000] | ||
| 11 | n_filters = len(freq_list) - 2 | ||
| 12 | |||
| 13 | f = filterbank(n_filters, win_s) | ||
| 14 | freqs = fvec(freq_list) | ||
| 15 | f.set_triangle_bands(freqs, samplerate) | ||
| 16 | |||
| 17 | coeffs = f.get_coeffs() | ||
| 18 | coeffs[4] *= 5. | ||
| 19 | |||
| 20 | f.set_coeffs(coeffs) | ||
| 21 | |||
| 22 | times = vstack([arange(win_s / 2 + 1) * samplerate / win_s] * n_filters) | ||
| 23 | title('Bank of filters built using a simple list of boundaries\nThe middle band has been amplified by 2.') | ||
| 24 | loglog(times.T, f.get_coeffs().T, '.-') | ||
| 25 | xlim([50, samplerate/2]) | ||
| 26 | ylim([1.0e-6, 2.0e-2]) | ||
| 27 | xlabel('log frequency (Hz)') | ||
| 28 | ylabel('log amplitude') | ||
| 29 | |||
| 30 | show() | ||