source: src/temporal/biquad.c @ c9e20ca1

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchsampleryinfft+
Last change on this file since c9e20ca1 was c9e20ca1, checked in by Paul Brossier <piem@piem.org>, 3 years ago

src/temporal/biquad.c: fix initialization (closes #82)

  • Property mode set to 100644
File size: 1.5 KB
Line 
1/*
2  Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org>
3
4  This file is part of aubio.
5
6  aubio is free software: you can redistribute it and/or modify
7  it under the terms of the GNU General Public License as published by
8  the Free Software Foundation, either version 3 of the License, or
9  (at your option) any later version.
10
11  aubio is distributed in the hope that it will be useful,
12  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  GNU General Public License for more details.
15
16  You should have received a copy of the GNU General Public License
17  along with aubio.  If not, see <http://www.gnu.org/licenses/>.
18
19*/
20
21#include "aubio_priv.h"
22#include "fvec.h"
23#include "lvec.h"
24#include "temporal/filter.h"
25#include "temporal/biquad.h"
26
27uint_t
28aubio_filter_set_biquad (aubio_filter_t * f, lsmp_t b0, lsmp_t b1, lsmp_t b2,
29    lsmp_t a1, lsmp_t a2)
30{
31  uint_t order = aubio_filter_get_order (f);
32  lvec_t *bs = aubio_filter_get_feedforward (f);
33  lvec_t *as = aubio_filter_get_feedback (f);
34
35  if (order != 3) {
36    AUBIO_ERROR ("order of biquad filter must be 3, not %d\n", order);
37    return AUBIO_FAIL;
38  }
39  bs->data[0] = b0;
40  bs->data[1] = b1;
41  bs->data[2] = b2;
42  as->data[0] = 1.;
43  as->data[1] = a1;
44  as->data[2] = a2;
45  return AUBIO_OK;
46}
47
48aubio_filter_t *
49new_aubio_filter_biquad (lsmp_t b0, lsmp_t b1, lsmp_t b2, lsmp_t a1, lsmp_t a2)
50{
51  aubio_filter_t *f = new_aubio_filter (3);
52  aubio_filter_set_biquad (f, b0, b1, b2, a1, a2);
53  return f;
54}
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