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 a spectral implementation of the YIN algorithm
23 This algorithm was derived from the YIN algorithm (see pitchyin.c). In this
24 implementation, a Fourier transform is used to compute a tapered square
25 difference function, which allows spectral weighting. Because the difference
26 function is tapered, the selection of the period is simplified.
28 Paul Brossier, ``Automatic annotation of musical audio for interactive
29 systems'', Chapter 3, Pitch Analysis, PhD thesis, Centre for Digital music,
30 Queen Mary University of London, London, UK, 2006.
41 /** pitch detection object */
42 typedef struct _aubio_pitchyinfft_t aubio_pitchyinfft_t;
44 /** execute pitch detection on an input buffer
46 \param p pitch detection object as returned by new_aubio_pitchyinfft
47 \param input input signal window (length as specified at creation time)
48 \param tol tolerance parameter for minima selection [default 0.85]
51 smpl_t aubio_pitchyinfft_detect (aubio_pitchyinfft_t *p, fvec_t * input, smpl_t tol);
52 /** creation of the pitch detection object
54 \param bufsize size of the input buffer to analyse
57 aubio_pitchyinfft_t * new_aubio_pitchyinfft (uint_t bufsize);
58 /** deletion of the pitch detection object
60 \param p pitch detection object as returned by new_aubio_pitchyinfft()
63 void del_aubio_pitchyinfft (aubio_pitchyinfft_t *p);
69 #endif /*PITCHYINFFT_H*/