source: src/temporal/biquad.c @ 741bdda

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 741bdda was 741bdda, checked in by Paul Brossier <piem@piem.org>, 10 years ago

src/temporal: switch to mono

  • 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
26uint_t
27aubio_filter_set_biquad (aubio_filter_t * f, lsmp_t b0, lsmp_t b1, lsmp_t b2,
28    lsmp_t a1, lsmp_t a2)
29{
30  uint_t order = aubio_filter_get_order (f);
31  lvec_t *bs = aubio_filter_get_feedforward (f);
32  lvec_t *as = aubio_filter_get_feedback (f);
33
34  if (order != 3) {
35    AUBIO_ERROR ("order of biquad filter must be 3, not %d\n", order);
36    return AUBIO_FAIL;
37  }
38  bs->data[0] = b0;
39  bs->data[1] = b1;
40  bs->data[2] = b2;
41  as->data[0] = 1.;
42  as->data[1] = a1;
43  as->data[1] = a2;
44  return AUBIO_OK;
45}
46
47aubio_filter_t *
48new_aubio_filter_biquad (lsmp_t b0, lsmp_t b1, lsmp_t b2, lsmp_t a1, lsmp_t a2)
49{
50  aubio_filter_t *f = new_aubio_filter (3);
51  aubio_filter_set_biquad (f, b0, b1, b2, a1, a2);
52  return f;
53}
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