ref: 7280e6782f5f5ac3a666eda48e66d6c2d2537fa8
dir: /src/pitch/pitchschmitt.h/
/*
Copyright (C) 2003 Paul Brossier
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** \file
Pitch detection using a Schmitt trigger
This pitch extraction method implements a Schmitt trigger to estimate the
period of a signal.
This file was derived from the tuneit project, written by Mario Lang to
detect the fundamental frequency of a sound.
see http://delysid.org/tuneit.html
*/
#ifndef _PITCHSCHMITT_H
#define _PITCHSCHMITT_H
#ifdef __cplusplus
extern "C" {
#endif
/** pitch detection object */
typedef struct _aubio_pitchschmitt_t aubio_pitchschmitt_t;
/** execute pitch detection on an input buffer
\param p pitch detection object as returned by new_aubio_pitchschmitt
\param input input signal window (length as specified at creation time)
\param output pitch period estimates, in samples
*/
void aubio_pitchschmitt_do (aubio_pitchschmitt_t *p, fvec_t * input, fvec_t * output);
/** creation of the pitch detection object
\param size size of the input buffer to analyse
*/
aubio_pitchschmitt_t * new_aubio_pitchschmitt (uint_t size);
/** deletion of the pitch detection object
\param p pitch detection object as returned by new_aubio_pitchschmitt
*/
void del_aubio_pitchschmitt (aubio_pitchschmitt_t *p);
#ifdef __cplusplus
}
#endif
#endif /* _PITCHSCHMITT_H */