diff options
Diffstat (limited to 'muse_qt4_evolution/synti/zynaddsubfx/DSP/FormantFilter.C')
| -rw-r--r-- | muse_qt4_evolution/synti/zynaddsubfx/DSP/FormantFilter.C | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/muse_qt4_evolution/synti/zynaddsubfx/DSP/FormantFilter.C b/muse_qt4_evolution/synti/zynaddsubfx/DSP/FormantFilter.C new file mode 100644 index 00000000..482cef91 --- /dev/null +++ b/muse_qt4_evolution/synti/zynaddsubfx/DSP/FormantFilter.C @@ -0,0 +1,163 @@ +/* + 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; + }; +}; + |