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/*
* maxiBark.cpp
* Bark scale loudness
*
* Created by Jakub on 01/12/2014.
* Copyright 2014 Goldsmiths Creative Computing. All rights reserved.
*
*/
#pragma once
#pragma pack(16)
#include "maxiFFT.h"
#include <math.h>
#include <iostream>
//#include <algorithm>
#include <cstdlib>
#ifdef __APPLE_CC__
#include <Accelerate/Accelerate.h>
#endif
using namespace std;
//convert to Bark scale (Zwicker, 1961)
inline double hzToBark(double hz) {
return 13.0*atan(hz/1315.8) + 3.5*atan(pow((hz/7518.0),2));
}
inline double binToHz(unsigned int bin, unsigned int sR, unsigned int bS) {
return bin*sR/bS;
}
template <class T>
class maxiBarkScaleAnalyser {
public:
int NUM_BARK_BANDS;
void setup(unsigned int sR, unsigned int bS) {
this->sampleRate = sR;
this->bufferSize = bS;
specSize = bS/2;
NUM_BARK_BANDS = 24;
for (int i=0; i<specSize; i++) {
barkScale[i] = hzToBark(binToHz(i, sR, bS));
}
bbLimits[0] = 0;
int currentBandEnd = barkScale[specSize-1]/NUM_BARK_BANDS;
int currentBand = 1;
for(int i = 0; i<specSize; i++){
while(barkScale[i] > currentBandEnd) {
bbLimits[currentBand] = i;
currentBand++;
currentBandEnd = currentBand*barkScale[specSize-1]/NUM_BARK_BANDS;
}
}
bbLimits[NUM_BARK_BANDS] = specSize-1;
};
double* specificLoudness(float* normalisedSpectrum) {
for (int i = 0; i < NUM_BARK_BANDS; i++){
double sum = 0;
for (int j = bbLimits[i] ; j < bbLimits[i+1] ; j++) {
sum += normalisedSpectrum[j];
}
specific[i] = pow(sum,0.23);
}
return specific;
};
double* relativeLoudness(float* normalisedSpectrum) {
for (int i = 0; i < NUM_BARK_BANDS; i++){
double sum = 0;
for (int j = bbLimits[i] ; j < bbLimits[i+1] ; j++) {
sum += normalisedSpectrum[j];
}
specific[i] = pow(sum,0.23);
}
double max = 0;
for (int i = 0; i < NUM_BARK_BANDS; i++){
if (specific[i] > max) max = specific[i];
}
for (int i = 0; i < NUM_BARK_BANDS; i++){
relative[i] = specific[i]/max;
}
return relative;
};
double* totalLoudness(float* normalisedSpectrum) {
for (int i = 0; i < NUM_BARK_BANDS; i++){
double sum = 0;
for (int j = bbLimits[i] ; j < bbLimits[i+1] ; j++) {
sum += normalisedSpectrum[j];
}
specific[i] = pow(sum,0.23);
}
total[0] = 0;
for (int i = 0; i < 24; i++){
total[0] += specific[i];
}
return total;
};
private:
int bbLimits[24];
unsigned int sampleRate, bufferSize, specSize;
double barkScale[2048];
double specific[24];
double relative[24];
double total[1];
};
typedef maxiBarkScaleAnalyser<double> maxiBark;
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