feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
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Last change
on this file since 735a739 was
735a739,
checked in by Paul Brossier <piem@piem.org>, 11 years ago
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python/demos/demo_filterbank.py: added simple filterbank demo
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Property mode set to
100755
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File size:
787 bytes
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| 1 | #! /usr/bin/python |
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| 2 | |
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| 3 | from aubio import filterbank, fvec |
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| 4 | from pylab import loglog, show, subplot, xlim, ylim, xlabel, ylabel, title |
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| 5 | from numpy import vstack, arange |
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| 6 | |
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| 7 | win_s = 2048 |
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| 8 | samplerate = 48000 |
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| 9 | |
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| 10 | freq_list = [60, 80, 200, 400, 800, 1600, 3200, 6400, 12800, 24000] |
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| 11 | n_filters = len(freq_list) - 2 |
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| 12 | |
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| 13 | f = filterbank(n_filters, win_s) |
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| 14 | freqs = fvec(freq_list) |
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| 15 | f.set_triangle_bands(freqs, samplerate) |
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| 16 | |
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| 17 | coeffs = f.get_coeffs() |
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| 18 | coeffs[4] *= 5. |
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| 19 | |
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| 20 | f.set_coeffs(coeffs) |
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| 21 | |
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| 22 | times = vstack([arange(win_s / 2 + 1) * samplerate / win_s] * n_filters) |
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| 23 | title('Bank of filters built using a simple list of boundaries\nThe middle band has been amplified by 2.') |
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| 24 | loglog(times.T, f.get_coeffs().T, '.-') |
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| 25 | xlim([50, samplerate/2]) |
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| 26 | ylim([1.0e-6, 2.0e-2]) |
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| 27 | xlabel('log frequency (Hz)') |
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| 28 | ylabel('log amplitude') |
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| 29 | |
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| 30 | show() |
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