source: src/spectral/filterbank.c @ 0e30a12

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretch
Last change on this file since 0e30a12 was 0e30a12, checked in by Paul Brossier <piem@piem.org>, 2 years ago

[filterbank] add norm and power parameters

  • Property mode set to 100644
File size: 2.7 KB
RevLine 
[88199ce]1/*
[06cae6c]2  Copyright (C) 2007-2009 Paul Brossier <piem@aubio.org>
3                      and Amaury Hazan <ahazan@iua.upf.edu>
[88199ce]4
[1c2e186]5  This file is part of aubio.
[88199ce]6
[1c2e186]7  aubio is free software: you can redistribute it and/or modify
[06cae6c]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.
[88199ce]11
[1c2e186]12  aubio is distributed in the hope that it will be useful,
[06cae6c]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.
[88199ce]16
[06cae6c]17  You should have received a copy of the GNU General Public License
[1c2e186]18  along with aubio.  If not, see <http://www.gnu.org/licenses/>.
[88199ce]19
[06cae6c]20*/
[f918cb9]21
[7c6c806]22#include "aubio_priv.h"
[6c7d49b]23#include "fvec.h"
[d95ff38]24#include "fmat.h"
[6c7d49b]25#include "cvec.h"
[0e30a12]26#include "vecutils.h"
[32d6958]27#include "spectral/filterbank.h"
[17961b0]28#include "mathutils.h"
[88199ce]29
[8708556]30/** \brief A structure to store a set of n_filters filters of lenghts win_s */
[e6c11e3]31struct _aubio_filterbank_t
[3b3b03e]32{
33  uint_t win_s;
34  uint_t n_filters;
[d95ff38]35  fmat_t *filters;
[0e30a12]36  smpl_t norm;
37  smpl_t power;
[7c6c806]38};
39
[3b3b03e]40aubio_filterbank_t *
41new_aubio_filterbank (uint_t n_filters, uint_t win_s)
42{
[06cae6c]43  /* allocate space for filterbank object */
[3b3b03e]44  aubio_filterbank_t *fb = AUBIO_NEW (aubio_filterbank_t);
45  fb->win_s = win_s;
46  fb->n_filters = n_filters;
[88199ce]47
[d95ff38]48  /* allocate filter tables, a matrix of length win_s and of height n_filters */
[4ed0ed1]49  fb->filters = new_fmat (n_filters, win_s / 2 + 1);
[88199ce]50
[0e30a12]51  fb->norm = 1;
52
53  fb->power = 1;
54
[b276dee]55  return fb;
56}
57
[3b3b03e]58void
59del_aubio_filterbank (aubio_filterbank_t * fb)
60{
[d95ff38]61  del_fmat (fb->filters);
[3b3b03e]62  AUBIO_FREE (fb);
[06cae6c]63}
[95a64c7]64
[3b3b03e]65void
[feb694b]66aubio_filterbank_do (aubio_filterbank_t * f, const cvec_t * in, fvec_t * out)
[3b3b03e]67{
[06cae6c]68  /* apply filter to all input channel, provided out has enough channels */
[fc2d7fb]69  //uint_t max_filters = MIN (f->n_filters, out->length);
70  //uint_t max_length = MIN (in->length, f->filters->length);
71
72  // view cvec->norm as fvec->data
73  fvec_t tmp;
74  tmp.length = in->length;
75  tmp.data = in->norm;
76
[0e30a12]77  if (f->power != 1.) fvec_pow(&tmp, f->power);
78
[fc2d7fb]79  fmat_vecmul(f->filters, &tmp, out);
[b276dee]80
81  return;
[fe28ff3]82}
[17961b0]83
[d95ff38]84fmat_t *
[feb694b]85aubio_filterbank_get_coeffs (const aubio_filterbank_t * f)
[3b3b03e]86{
[06cae6c]87  return f->filters;
[17961b0]88}
[33916b8]89
90uint_t
[feb694b]91aubio_filterbank_set_coeffs (aubio_filterbank_t * f, const fmat_t * filter_coeffs)
[33916b8]92{
[d95ff38]93  fmat_copy(filter_coeffs, f->filters);
[33916b8]94  return 0;
95}
[0e30a12]96
97uint_t
98aubio_filterbank_set_norm (aubio_filterbank_t *f, smpl_t norm)
99{
100  if (norm != 0 && norm != 1) return AUBIO_FAIL;
101  f->norm = norm;
102  return AUBIO_OK;
103}
104
105smpl_t
106aubio_filterbank_get_norm (aubio_filterbank_t *f)
107{
108  return f->norm;
109}
110
111uint_t
112aubio_filterbank_set_power (aubio_filterbank_t *f, smpl_t power)
113{
114  f->power = power;
115  return AUBIO_OK;
116}
117
118smpl_t
119aubio_filterbank_get_power (aubio_filterbank_t *f)
120{
121  return f->norm;
122}
Note: See TracBrowser for help on using the repository browser.