2 Copyright (C) 2003 Paul Brossier
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 Pitch detection using the YIN algorithm
23 This algorithm was developped by A. de Cheveigne and H. Kawahara and
26 De Cheveigné, A., Kawahara, H. (2002) "YIN, a fundamental frequency
27 estimator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930.
29 see http://recherche.ircam.fr/equipes/pcm/pub/people/cheveign.html
40 /** compute difference function
42 \param input input signal
43 \param yinbuf output buffer to store difference function (half shorter than input)
46 void aubio_pitchyin_diff(fvec_t * input, fvec_t * yinbuf);
48 /** in place computation of the YIN cumulative normalised function
50 \param yinbuf input signal (a square difference function), also used to store function
53 void aubio_pitchyin_getcum(fvec_t * yinbuf);
55 /** detect pitch in a YIN function
57 \param yinbuf input buffer as computed by aubio_pitchyin_getcum
60 uint_t aubio_pitchyin_getpitch(fvec_t *yinbuf);
62 /** fast implementation of the YIN algorithm
64 \param input input signal
65 \param yinbuf input buffer used to compute the YIN function
66 \param tol tolerance parameter for minima selection [default 0.15]
69 smpl_t aubio_pitchyin_getpitchfast(fvec_t * input, fvec_t *yinbuf, smpl_t tol);