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/*
vox - a musical real-time vocoder. version 1.0
Copyright (C) 2000 Simon MORLAT (simon.morlat@free.fr)
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
void lpc_filter(double *buf_ppf, double *lpc_coef, double *buf_sy, int n)
{
int i,j;
double acc;
for(i=0; i<n; i++)
{
acc=buf_ppf[i]*lpc_coef[0];
for(j=1; j<11; j++)
{
acc=acc-lpc_coef[j]*buf_sy[i-j];
};
buf_sy[i]=acc;
};
}
void hp_filter(double *in,double cut,int n)
{
int i;
double prev_e,s_out;
prev_e=s_out=0;
for(i=0; i<n; i++)
{
s_out=in[i]-prev_e+cut*s_out;
prev_e=in[i];
in[i]=s_out;
};
}
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