1 | /* |
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2 | Copyright (C) 2007 Amaury Hazan <ahazan@iua.upf.edu> |
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3 | and Paul Brossier <piem@piem.org> |
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4 | |
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5 | This program is free software; you can redistribute it and/or modify |
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6 | it under the terms of the GNU General Public License as published by |
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7 | the Free Software Foundation; either version 2 of the License, or |
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8 | (at your option) any later version. |
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9 | |
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10 | This program is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | GNU General Public License for more details. |
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14 | |
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15 | You should have received a copy of the GNU General Public License |
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16 | along with this program; if not, write to the Free Software |
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17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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18 | */ |
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19 | |
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20 | /** \file |
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21 | |
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22 | Filterbank object |
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23 | |
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24 | General-purpose spectral filterbank object. Comes with mel-filter initialization function. |
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25 | |
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26 | */ |
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27 | |
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28 | #ifndef FILTERBANK_H |
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29 | #define FILTERBANK_H |
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30 | |
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31 | #ifdef __cplusplus |
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32 | extern "C" { |
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33 | #endif |
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34 | |
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35 | typedef struct aubio_filterbank_t_ aubio_filterbank_t; |
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36 | |
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37 | /** create filterbank object |
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38 | |
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39 | \param win_s size of analysis buffer (and length the FFT transform) |
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40 | \param n_filters number of filters to create |
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41 | |
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42 | */ |
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43 | |
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44 | aubio_filterbank_t * new_aubio_filterbank(uint_t n_filters, uint_t win_s); |
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45 | |
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46 | /** filterbank initialization for mel filters |
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47 | |
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48 | |
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49 | \param n_filters number of filters |
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50 | \param win_s window size |
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51 | \param samplerate |
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52 | \param freq_min lowest filter frequency |
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53 | \param freq_max highest filter frequency |
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54 | |
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55 | */ |
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56 | aubio_filterbank_t * new_aubio_filterbank_mfcc(uint_t n_filters, uint_t win_s, uint_t samplerate, smpl_t freq_min, smpl_t freq_max); |
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57 | |
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58 | /** filterbank initialization for mel filters |
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59 | |
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60 | \param n_filters number of filters |
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61 | \param win_s window size |
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62 | \param samplerate |
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63 | \param freq_min lowest filter frequency |
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64 | \param freq_max highest filter frequency |
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65 | |
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66 | */ |
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67 | aubio_filterbank_t * new_aubio_filterbank_mfcc_2(uint_t n_filters, uint_t win_s, uint_t samplerate, smpl_t freq_min, smpl_t freq_max); |
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68 | |
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69 | |
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70 | /** destroy filterbank object |
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71 | |
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72 | \param fb filterbank, as returned by new_aubio_filterbank method |
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73 | |
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74 | */ |
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75 | void del_aubio_filterbank(aubio_filterbank_t * fb); |
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76 | |
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77 | /** compute filterbank |
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78 | |
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79 | */ |
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80 | void aubio_filterbank_do(aubio_filterbank_t * fb, cvec_t * in, fvec_t *out); |
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81 | |
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82 | /** dump filterbank filter tables in a txt file |
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83 | |
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84 | */ |
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85 | void aubio_dump_filterbank(aubio_filterbank_t * fb); |
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86 | |
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87 | #ifdef __cplusplus |
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88 | } |
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89 | #endif |
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90 | |
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91 | #endif // FILTERBANK_H |
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