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filterbank_mel.h
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1 /*
2  Copyright (C) 2007-2013 Paul Brossier <piem@aubio.org>
3  and Amaury Hazan <ahazan@iua.upf.edu>
4 
5  This file is part of aubio.
6 
7  aubio is free software: you can redistribute it and/or modify
8  it under the terms of the GNU General Public License as published by
9  the Free Software Foundation, either version 3 of the License, or
10  (at your option) any later version.
11 
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13  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  GNU General Public License for more details.
16 
17  You should have received a copy of the GNU General Public License
18  along with aubio. If not, see <http://www.gnu.org/licenses/>.
19 
20 */
21 
22 /** \file
23 
24  Filterbank object coefficients initialization
25 
26  Functions to create set the ::aubio_filterbank_t coefficients to
27  - ::aubio_filterbank_set_triangle_bands: overlapping triangular bands,
28  - ::aubio_filterbank_set_mel_coeffs_slaney: Mel frequency bands.
29 
30  \example spectral/test-filterbank_mel.c
31 
32 */
33 
34 #ifndef _AUBIO_FILTERBANK_MEL_H
35 #define _AUBIO_FILTERBANK_MEL_H
36 
37 #ifdef __cplusplus
38 extern "C"
39 {
40 #endif
41 
42 /** filterbank initialization with triangular and overlapping bands
43 
44  \param fb filterbank object
45  \param freqs arbitrary array of boundary frequencies
46  \param samplerate audio sampling rate
47 
48  This function computes the coefficients of the filterbank based on the
49  boundaries found in freqs, in Hz, and using triangular overlapping bands.
50 
51 */
53  fvec_t * freqs, smpl_t samplerate);
54 
55 /** filterbank initialization for Mel filters using Slaney's coefficients
56 
57  \param fb filterbank object
58  \param samplerate audio sampling rate
59 
60  The filter coefficients are built according to Malcolm Slaney's Auditory
61  Toolbox, available at http://cobweb.ecn.purdue.edu/~malcolm/interval/1998-010/
62  (see file mfcc.m).
63 
64 */
66  smpl_t samplerate);
67 
68 #ifdef __cplusplus
69 }
70 #endif
71 
72 #endif /* _AUBIO_FILTERBANK_MEL_H */
struct _aubio_filterbank_t aubio_filterbank_t
filterbank object
Definition: filterbank.h:45
uint_t aubio_filterbank_set_mel_coeffs_slaney(aubio_filterbank_t *fb, smpl_t samplerate)
filterbank initialization for Mel filters using Slaney&#39;s coefficients
float smpl_t
short sample format (32 or 64 bits)
Definition: types.h:41
uint_t aubio_filterbank_set_triangle_bands(aubio_filterbank_t *fb, fvec_t *freqs, smpl_t samplerate)
filterbank initialization with triangular and overlapping bands
Buffer for real data.
Definition: fvec.h:67
unsigned int uint_t
unsigned integer
Definition: types.h:60