source: src/filterbank.h @ 17961b0

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change on this file since 17961b0 was 17961b0, checked in by Paul Brossier <piem@piem.org>, 17 years ago

filterbank.{c,h}: add aubio_filterbank_get_channel function

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