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/*
ZynAddSubFX - a software synthesizer
Filter.C - Filters, uses analog,formant,etc. filters
Copyright (C) 2002-2005 Nasca Octavian Paul
Author: Nasca Octavian Paul
This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License
as published by the Free Software Foundation.
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 (version 2) for more details.
You should have received a copy of the GNU General Public License (version 2)
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <math.h>
#include <stdio.h>
#include "Filter.h"
Filter::Filter(FilterParams *pars){
unsigned char Ftype=pars->Ptype;
unsigned char Fstages=pars->Pstages;
category=pars->Pcategory;
switch (category) {
case 1:filter=new FormantFilter(pars);
break;
case 2:filter=new SVFilter(Ftype,1000.0,pars->getq(),Fstages);
filter->outgain=dB2rap(pars->getgain());
if (filter->outgain>1.0) filter->outgain=sqrt(filter->outgain);
break;
default:filter=new AnalogFilter(Ftype,1000.0,pars->getq(),Fstages);
if ((Ftype>=6)&&(Ftype<=8)) filter->setgain(pars->getgain());
else filter->outgain=dB2rap(pars->getgain());
break;
};
};
Filter::~Filter(){
delete (filter);
};
void Filter::filterout(REALTYPE *smp){
filter->filterout(smp);
};
void Filter::setfreq(REALTYPE frequency){
filter->setfreq(frequency);
};
void Filter::setfreq_and_q(REALTYPE frequency,REALTYPE q_){
filter->setfreq_and_q(frequency,q_);
};
void Filter::setq(REALTYPE q_){
filter->setq(q_);
};
REALTYPE Filter::getrealfreq(REALTYPE freqpitch){
if ((category==0)||(category==2)) return(pow(2.0,freqpitch+9.96578428));//log2(1000)=9.95748
else return(freqpitch);
};
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