ref: dee41640230a506657873f5a38e5ba4c2cd03d84
dir: /src/pitch/pitchschmitt.h/
/* Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org> This file is part of aubio. aubio 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 3 of the License, or (at your option) any later version. aubio 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 aubio. If not, see <http://www.gnu.org/licenses/>. */ /** \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 \example pitch/test-pitchschmitt.c */ #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 samples_in input signal vector (length as specified at creation time) \param cands_out pitch period estimates, in samples */ void aubio_pitchschmitt_do (aubio_pitchschmitt_t * p, fvec_t * samples_in, fvec_t * cands_out); /** creation of the pitch detection object \param buf_size size of the input buffer to analyse */ aubio_pitchschmitt_t *new_aubio_pitchschmitt (uint_t buf_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 */