| 1 | /* |
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| 2 | Copyright (C) 2007-2009 Paul Brossier <piem@aubio.org> |
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| 3 | and Amaury Hazan <ahazan@iua.upf.edu> |
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| 4 | |
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| 5 | This file is part of aubio. |
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| 6 | |
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| 7 | aubio is free software: you can redistribute it and/or modify |
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| 8 | it under the terms of the GNU General Public License as published by |
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| 9 | the Free Software Foundation, either version 3 of the License, or |
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| 10 | (at your option) any later version. |
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| 11 | |
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| 12 | aubio is distributed in the hope that it will be useful, |
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | GNU General Public License for more details. |
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| 16 | |
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| 17 | You should have received a copy of the GNU General Public License |
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| 18 | along with aubio. If not, see <http://www.gnu.org/licenses/>. |
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| 19 | |
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| 20 | */ |
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| 21 | |
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| 22 | /** \file |
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| 23 | |
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| 24 | Filterbank object coefficients initialization |
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| 25 | |
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| 26 | Functions to create set the ::aubio_filterbank_t coefficients to |
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| 27 | - ::aubio_filterbank_set_triangle_bands: overlapping triangular bands, |
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| 28 | - ::aubio_filterbank_set_mel_coeffs_slaney: Mel frequency bands. |
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| 29 | |
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| 30 | \example spectral/test-filterbank_mel.c |
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| 31 | |
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| 32 | */ |
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| 33 | |
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| 34 | #ifndef FILTERBANK_MEL_H |
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| 35 | #define FILTERBANK_MEL_H |
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| 36 | |
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| 37 | #ifdef __cplusplus |
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| 38 | extern "C" |
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| 39 | { |
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| 40 | #endif |
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| 41 | |
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| 42 | /** filterbank initialization with triangular and overlapping bands |
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| 43 | |
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| 44 | \param fb filterbank object |
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| 45 | \param freqs arbitrary array of boundary frequencies |
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| 46 | \param samplerate audio sampling rate |
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| 47 | |
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| 48 | This function computes the coefficients of the filterbank based on the |
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| 49 | boundaries found in freqs, in Hz, and using triangular overlapping bands. |
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| 50 | |
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| 51 | */ |
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| 52 | uint_t aubio_filterbank_set_triangle_bands (aubio_filterbank_t * fb, |
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| 53 | fvec_t * freqs, smpl_t samplerate); |
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| 54 | |
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| 55 | /** filterbank initialization for Mel filters using Slaney's coefficients |
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| 56 | |
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| 57 | \param fb filterbank object |
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| 58 | \param samplerate audio sampling rate |
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| 59 | |
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| 60 | The filter coefficients are built according to Malcolm Slaney's Auditory |
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| 61 | Toolbox, available at http://cobweb.ecn.purdue.edu/~malcolm/interval/1998-010/ |
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| 62 | (see file mfcc.m). |
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| 63 | |
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| 64 | */ |
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| 65 | uint_t aubio_filterbank_set_mel_coeffs_slaney (aubio_filterbank_t * fb, |
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| 66 | smpl_t samplerate); |
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| 67 | |
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| 68 | #ifdef __cplusplus |
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| 69 | } |
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| 70 | #endif |
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| 71 | |
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| 72 | #endif // FILTERBANK_MEL_H |
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