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/*
libaudiomask - hybrid simultaneous audio masking threshold evaluation library
Copyright (C) 2000-2010 Dr Matthew Raphael Flax
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <math.h>
#include <complex>
#include <values.h>
#include "AudioMask.H"
AudioMask::
AudioMask(int sampFreq, int fBankCount) : MooreSpread(fBankCount){
fs=sampFreq;
mask=Lvmu=NULL;
if (!(excitation=new double[fBankCount]))
std::cerr << "AudioMask: excitation malloc: Out of Memory"<<std::endl;
if (!(mask=new double[fBankCount]))
std::cerr << "AudioMask: mask malloc: Out of Memory"<<std::endl;
if (!(Lvmu=new double[fBankCount*fBankCount]))
std::cerr << "AudioMask: Lvmu malloc: Out of Memory"<<std::endl;
}
AudioMask::
~AudioMask(void){
if (excitation) delete [] excitation;
excitation=NULL;
if (mask) delete [] mask;
mask=NULL;
if (Lvmu) delete [] Lvmu;
Lvmu=NULL;
}
#include <fstream>
#define F2CB(f) (13.3*atan(0.75*f/1000))
void AudioMask::
exciteTerhardt(double **filterBankOutput, int sampleCount){
max=-MAXDOUBLE;
// Find the factor to scale by and scale ...
factor=fabs(bankCount-F2CB((double)fs/2.0));
// std::cout <<"factor "<<factor<<std::endl;
// Find the excitation ...
for (int i=0;i<bankCount;i++){
// int which=bankCount-i-1;
//int which=i;
excitation[i]=0.0;
for (int j=0;j<sampleCount;j++){
excitation[i]+=filterBankOutput[i][j];
}
excitation[i]=10.0*log10(excitation[i]);
if (sampleCount!=fs){
// std::cout<<"adjusting"<<std::endl;
// excitation[i]+=20*log10((fs/2.0-sampleCount)/sampleCount);
}
}
/* ofstream ex("excite.dat");
for (int i=0;i<bankCount;i++)
ex<<excitation[i]<<'\n';
ex.close();*/
// Find the spreading function ...
// MooreSpread::excite(filterBankOutput, sampleCount, fs);
MooreSpread::excite(filterBankOutput, fs, fs);
/*
ofstream os("spread.dat");
for (int i=0;i<bankCount;i++){
for (int j=0;j<bankCount;j++)
os<<10.0*log10(spread[i][j])<<'\t';
os<<std::endl;
}
os.close();
*/
// Find the mask ...
for (int i=0;i<bankCount;i++){
for (int j=0;j<bankCount;j++)
Lvmu[j+i*bankCount]=excitation[j]+10.0*log10(spread[i][j]);
}
/* ofstream lvmu("Lvmu.dat");
for (int i=0;i<bankCount;i++){
for (int j=0;j<bankCount;j++){
lvmu<<Lvmu[j+i*bankCount]<<'\t';
}
lvmu<<std::endl;
}*/
for (int i=0;i<bankCount;i++){
mask[i]=0.0;
for (int j=0;j<i;j++) // Lower Freqs.
mask[i]+=pow(10.0,Lvmu[i+j*bankCount]/20.0);
for (int j=i+1;j<bankCount;j++) // Higher Freqs.
mask[i]+=pow(10.0,Lvmu[i+j*bankCount]/20.0);
mask[i]/=factor;
if (mask[i]>max) max=mask[i];
// std::cout<<excitation[i]<< '\t'<<mask[i]<<std::endl;
}
}
#define ALPHA 0.8
void AudioMask::
exciteBeerends(double **filterBankOutput, int sampleCount){
max=-1000000.0;
// Find the factor to scale by and scale ...
factor=fabs(bankCount-F2CB((double)fs/2.0));
// Find the excitation ...
for (int i=0;i<bankCount;i++){
int which=bankCount-i-1;
excitation[which]=0.0;
for (int j=0;j<sampleCount;j++){
excitation[which]+=filterBankOutput[i][j];
}
excitation[which]=10.0*log10(excitation[which]);
}
// Find the spreading function ...
MooreSpread::excite(filterBankOutput, sampleCount, fs);
// Find the mask ...
for (int i=0;i<bankCount;i++){
for (int j=0;j<bankCount;j++)
Lvmu[j+i*bankCount]=excitation[j]+10.0*log10(spread[i][j]);
}
for (int i=0;i<bankCount;i++){
mask[i]=0.0;
for (int j=0;j<i;j++) // Lower Freqs.
mask[i]+=pow(10.0,pow(Lvmu[i+j*bankCount],ALPHA)/20.0);
for (int j=i+1;j<bankCount;j++) // Higher Freqs.
mask[i]+=pow(10.0,pow(Lvmu[i+j*bankCount],ALPHA)/20.0);
mask[i]=pow(mask[i], 1.0/ALPHA);
mask[i]/=factor;
if (mask[i]>max) max=mask[i];
// std::cout<<excitation[i]<< '\t'<<mask[i]<<std::endl;
}
}
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