2 Copyright (C) 2003-2013 Paul Brossier <piem@aubio.org>
4 This file is part of aubio.
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.
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.
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/>.
23 Pitch detection using a Schmitt trigger
25 This pitch extraction method implements a Schmitt trigger to estimate the
28 This file was derived from the tuneit project, written by Mario Lang to
29 detect the fundamental frequency of a sound.
31 See http://delysid.org/tuneit.html
33 \example pitch/test-pitchschmitt.c
37 #ifndef AUBIO_PITCHSCHMITT_H
38 #define AUBIO_PITCHSCHMITT_H
44 /** pitch detection object */
45 typedef struct _aubio_pitchschmitt_t aubio_pitchschmitt_t;
47 /** execute pitch detection on an input buffer
49 \param p pitch detection object as returned by new_aubio_pitchschmitt
50 \param samples_in input signal vector (length as specified at creation time)
51 \param cands_out pitch period estimates, in samples
54 void aubio_pitchschmitt_do (aubio_pitchschmitt_t * p, const fvec_t * samples_in,
57 /** creation of the pitch detection object
59 \param buf_size size of the input buffer to analyse
62 aubio_pitchschmitt_t *new_aubio_pitchschmitt (uint_t buf_size);
64 /** deletion of the pitch detection object
66 \param p pitch detection object as returned by new_aubio_pitchschmitt
69 void del_aubio_pitchschmitt (aubio_pitchschmitt_t * p);
75 #endif /* AUBIO_PITCHSCHMITT_H */