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/*
ZynAddSubFX - a software synthesizer
FormantFilter.C - formant 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 "FormantFilter.h"
FormantFilter::FormantFilter(FilterParams *pars){
numformants=pars->Pnumformants;
for (int i=0;i<numformants;i++) formant[i]=new AnalogFilter(4/*BPF*/,1000.0,10.0,pars->Pstages);
cleanup();
inbuffer=new REALTYPE [SOUND_BUFFER_SIZE];
tmpbuf=new REALTYPE [SOUND_BUFFER_SIZE];
for (int j=0;j<FF_MAX_VOWELS;j++)
for (int i=0;i<numformants;i++){
formantpar[j][i].freq=pars->getformantfreq(pars->Pvowels[j].formants[i].freq);
formantpar[j][i].amp=pars->getformantamp(pars->Pvowels[j].formants[i].amp);
formantpar[j][i].q=pars->getformantq(pars->Pvowels[j].formants[i].q);
};
for (int i=0;i<FF_MAX_FORMANTS;i++) oldformantamp[i]=1.0;
for (int i=0;i<numformants;i++){
currentformants[i].freq=1000.0;
currentformants[i].amp=1.0;
currentformants[i].q=2.0;
};
formantslowness=pow(1.0-(pars->Pformantslowness/128.0),3.0);
sequencesize=pars->Psequencesize;if (sequencesize==0) sequencesize=1;
for (int k=0;k<sequencesize;k++) sequence[k].nvowel=pars->Psequence[k].nvowel;
vowelclearness=pow(10.0,(pars->Pvowelclearness-32.0)/48.0);
sequencestretch=pow(0.1,(pars->Psequencestretch-32.0)/48.0);
if (pars->Psequencereversed) sequencestretch*= -1.0;
outgain=dB2rap(pars->getgain());
oldinput=-1.0;
Qfactor=1.0;oldQfactor=Qfactor;
firsttime=1;
};
FormantFilter::~FormantFilter(){
for (int i=0;i<numformants;i++) delete(formant[i]);
delete (inbuffer);
delete (tmpbuf);
};
void FormantFilter::cleanup(){
for (int i=0;i<numformants;i++) formant[i]->cleanup();
};
void FormantFilter::setpos(REALTYPE input){
int p1,p2;
if (firsttime!=0) slowinput=input;
else slowinput=slowinput*(1.0-formantslowness)+input*formantslowness;
if ((fabs(oldinput-input)<0.001)&&(fabs(slowinput-input)<0.001)&&
(fabs(Qfactor-oldQfactor)<0.001)) {
// oldinput=input; daca setez asta, o sa faca probleme la schimbari foarte lente
firsttime=0;
return;
} else oldinput=input;
REALTYPE pos=fmod(input*sequencestretch,1.0);if (pos<0.0) pos+=1.0;
F2I(pos*sequencesize,p2);
p1=p2-1;if (p1<0) p1+=sequencesize;
pos=fmod(pos*sequencesize,1.0);
if (pos<0.0) pos=0.0; else if (pos>1.0) pos=1.0;
pos=(atan((pos*2.0-1.0)*vowelclearness)/atan(vowelclearness)+1.0)*0.5;
p1=sequence[p1].nvowel;
p2=sequence[p2].nvowel;
if (firsttime!=0) {
for (int i=0;i<numformants;i++){
currentformants[i].freq=formantpar[p1][i].freq*(1.0-pos)+formantpar[p2][i].freq*pos;
currentformants[i].amp=formantpar[p1][i].amp*(1.0-pos)+formantpar[p2][i].amp*pos;
currentformants[i].q=formantpar[p1][i].q*(1.0-pos)+formantpar[p2][i].q*pos;
formant[i]->setfreq_and_q(currentformants[i].freq,currentformants[i].q*Qfactor);
oldformantamp[i]=currentformants[i].amp;
};
firsttime=0;
} else {
for (int i=0;i<numformants;i++){
currentformants[i].freq=currentformants[i].freq*(1.0-formantslowness)
+(formantpar[p1][i].freq*(1.0-pos)+formantpar[p2][i].freq*pos)*formantslowness;
currentformants[i].amp=currentformants[i].amp*(1.0-formantslowness)
+(formantpar[p1][i].amp*(1.0-pos)+formantpar[p2][i].amp*pos)*formantslowness;
currentformants[i].q=currentformants[i].q*(1.0-formantslowness)
+(formantpar[p1][i].q*(1.0-pos)+formantpar[p2][i].q*pos)*formantslowness;
formant[i]->setfreq_and_q(currentformants[i].freq,currentformants[i].q*Qfactor);
};
};
oldQfactor=Qfactor;
};
void FormantFilter::setfreq(REALTYPE frequency){
setpos(frequency);
};
void FormantFilter::setq(REALTYPE q_){
Qfactor=q_;
for (int i=0;i<numformants;i++) formant[i]->setq(Qfactor*currentformants[i].q);
};
void FormantFilter::setfreq_and_q(REALTYPE frequency,REALTYPE q_){
Qfactor=q_;
setpos(frequency);
};
void FormantFilter::filterout(REALTYPE *smp){
int i,j;
for (i=0;i<SOUND_BUFFER_SIZE;i++) {
inbuffer[i]=smp[i];
smp[i]=0.0;
};
for (j=0;j<numformants;j++) {
for (i=0;i<SOUND_BUFFER_SIZE;i++) tmpbuf[i]=inbuffer[i]*outgain;
formant[j]->filterout(tmpbuf);
if (ABOVE_AMPLITUDE_THRESHOLD(oldformantamp[j],currentformants[j].amp))
for (i=0;i<SOUND_BUFFER_SIZE;i++) smp[i]+=tmpbuf[i]*
INTERPOLATE_AMPLITUDE(oldformantamp[j],currentformants[j].amp,i,SOUND_BUFFER_SIZE);
else for (i=0;i<SOUND_BUFFER_SIZE;i++) smp[i]+=tmpbuf[i]*currentformants[j].amp;
oldformantamp[j]=currentformants[j].amp;
};
};
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