source: src/spectral/filterbank_mel.h @ 3c18f9e

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 3c18f9e was 3c18f9e, checked in by Paul Brossier <piem@piem.org>, 11 years ago

src/spectral/filterbank_mel.{c,h}: rename _set_mel_coeffs to _set_triangle_bands, add some warnings, setters return uint_t,

  • Property mode set to 100644
File size: 2.0 KB
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1/*
2  Copyright (C) 2007-2009 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
12  aubio is distributed in the hope that it will be useful,
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  Mel frequency filter bankd coefficients
25
26  Set filter bank coefficients to Mel frequency bands.
27
28  The filter coefficients are built according to Malcolm Slaney's Auditory
29  Toolbox available at http://cobweb.ecn.purdue.edu/~malcolm/interval/1998-010/
30  (see the file mfcc.m).
31
32*/
33
34#ifndef FILTERBANK_MEL_H
35#define FILTERBANK_MEL_H
36
37#ifdef __cplusplus
38extern "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*/
52uint_t aubio_filterbank_set_triangle_bands (aubio_filterbank_t * fb,
53    smpl_t samplerate, fvec_t * freqs);
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  This function fills the filterbank coefficients according to Malcolm Slaney.
61
62*/
63uint_t aubio_filterbank_set_mel_coeffs_slaney (aubio_filterbank_t * fb,
64    smpl_t samplerate);
65
66#ifdef __cplusplus
67}
68#endif
69
70#endif                          // FILTERBANK_MEL_H
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