/**
@file pitch.c
@brief Pitch analysis
*/
/* Copyright (C) 2005
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include
#include
#include "fftwrap.h"
#include "pitch.h"
void find_spectral_pitch(void *fft, float *x, float *y, int lag, int len, int *pitch)
{
int n2 = lag/2;
float xx[lag];
float X[lag];
float Y[lag];
float curve[n2];
int i;
for (i=0;i=0;i--)
curve[i] = curve[i] + .7*curve[i+1];
X[0] = 0;
for (i=1;ilag/6)
// n *= .5;
float tmp = X[2*i-1];
X[2*i-1] = (X[2*i-1]*Y[2*i-1] + X[2*i ]*Y[2*i ])*n;
X[2*i ] = (- X[2*i ]*Y[2*i-1] + tmp*Y[2*i ])*n;
}
X[lag-1] = 0;
X[0] = X[lag-1] = 0;
spx_ifft(fft, X, xx);
float max_corr=-1e10;
//int pitch;
*pitch = 0;
for (i=0;i max_corr)
{
*pitch = i;
max_corr = xx[i];
}
}
//printf ("\n");
//printf ("%d %f\n", *pitch, max_corr);
//printf ("%d\n", *pitch);
}