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/* Copyright 2001,2002 Matt Flax <flatmax@ieee.org>
This file is part of the MFFM FFTw Wrapper library.
MFFM MFFM FFTw Wrapper library 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 2 of the License, or
(at your option) any later version.
MFFM FFTw Wrapper library 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 have received a copy of the GNU General Public License
along with the MFFM FFTw Wrapper library
*/
#include "realFFTData.H"
#include <values.h>
#include <iostream>
#include <math.h>
#include <stdlib.h>
realFFTData::
realFFTData(int sz){
deleteInOutMemory=1;
//cout <<"realFFTData init:"<<this<<endl;
size=sz;
in = out = power_spectrum = NULL;
// powerDeriv = NULL;
in = new fftw_real[size];
out = new fftw_real[size];
power_spectrum = new fftw_real[size/2+1];
if (!in || !out || !power_spectrum){
std::cerr << "Could not allocate enough mem for a realFFT"<<std::endl;
if (in) delete [] in;
if (out) delete [] out;
if (power_spectrum) delete [] power_spectrum;
exit(-1);
}
totalPower = 0.0;
}
realFFTData::
realFFTData(int sz, fftw_real *inp, fftw_real *outp){
deleteInOutMemory=0;
// cout <<"realFFTData init:"<<this<<endl;
size=sz;
if (!inp || !outp){
std::cerr<<"realFFTData::realFFTData : input or output array doesn't exist"<<std::endl;
exit(-1);
}
in = inp;
out = outp;
power_spectrum = NULL;
//powerDeriv = NULL;
power_spectrum = new fftw_real[size/2+1];
if (!power_spectrum){
std::cerr << "Could not allocate enough mem for a realFFT"<<std::endl;
if (power_spectrum) delete [] power_spectrum;
exit(-1);
}
totalPower = 0.0;
}
realFFTData::
~realFFTData(){
if (power_spectrum) delete [] power_spectrum; power_spectrum=NULL;
//if (powerDeriv) delete [] powerDeriv; powerDeriv=NULL;
// std::cout<<"realFFTData::~realFFTData"<<std::endl;
if (deleteInOutMemory){
if (in) delete [] in; in=NULL;
if (out) delete [] out; out=NULL;
}
//std::cout<<"realFFTData::~realFFTData exit"<<std::endl;
}
fftw_real realFFTData::
findMaxIn(){
fftw_real max=-MAXDOUBLE;
for (int i=0; i<getSize(); i++)
if (in[i]>max)
max=in[i];
// cout<<"max "<<max<<endl;
return max;
}
void realFFTData::
findMaxMinPowerBins(void){
double min=MAXDOUBLE;
double max=-min;
for (int i=0; i<getHalfSize(); i++){
if (power_spectrum[i]>max)
max=power_spectrum[maxPowerBin=i];
if (power_spectrum[i]<min)
min=power_spectrum[minPowerBin=i];
}
// cout<<"min bin "<<minPowerBin<<'\t'<<min<<" max poewr bin "<<maxPowerBin<<'\t'<<max<<endl;
}
int realFFTData::
limitHalfPowerSpec(double lim){
double max=0.0;
int bin=0;
for (int i=0; i<getHalfSize(); i++)
if (power_spectrum[i]> max)
max=power_spectrum[bin=i];
for (int i=0; i<getHalfSize(); i++)
power_spectrum[i] /=(max/lim);
return bin;
}
int realFFTData::
compPowerSpec(){
// int bin;
totalPower = 0.0;
double min=MAXDOUBLE;
double max=-min;
power_spectrum[maxPowerBin=0] = out[0]*out[0]; /* DC component */
for (int k = 1; k < (getSize()+1)/2; ++k){ /* (k < N/2 rounded up) */
if ((power_spectrum[k] = out[k]*out[k] + out[getSize()-k]*out[getSize()-k])>max){
max=power_spectrum[maxPowerBin=k];
}
if (power_spectrum[k]<min) min=power_spectrum[minPowerBin=k];
totalPower += power_spectrum[k];
}
if (getSize() % 2 == 0){ /* N is even */
power_spectrum[getSize()/2] = out[getSize()/2]*out[getSize()/2]; /* Nyquist freq. */
if (power_spectrum[getSize()/2]>max)
max=power_spectrum[maxPowerBin=getSize()/2];
if (power_spectrum[getSize()/2]<min)
min=power_spectrum[minPowerBin=getSize()/2];
totalPower += power_spectrum[getSize()/2];
}
return maxPowerBin;
}
int realFFTData::
sqrtPowerSpec(){
double max=-MAXDOUBLE;
for (int k = 0; k < (getSize()+1)/2; ++k) /* (k < N/2 rounded up) */
if ((power_spectrum[k]=sqrt(power_spectrum[k]))>max)
max=power_spectrum[maxPowerBin=k];
return maxPowerBin;
}
/*
int realFFTData::
powerSpecDeriv(){
if (!powerDeriv){ // create memory if it doesn't exist
powerDeriv = new fftw_real[size/2+1];
if (!powerDeriv){
std::cerr << "Could not allocate enough mem for a powerSpectrum deriv"<<std::endl;
exit(-1);
}
}
int pos=0;
double max = 0.0;
powerDeriv[0] = 0.0; // DC component
for (int k = 1; k < (getSize()+1)/2; ++k){ // (k < N/2 rounded up)
if (fabs(powerDeriv[k] = power_spectrum[k]-power_spectrum[k-1]) > max){
max = fabs(powerDeriv[k] = power_spectrum[k]-power_spectrum[k-1]);
pos = k;
}
}
if (getSize() % 2 == 0) // N is even
if (fabs(powerDeriv[getSize()/2] = power_spectrum[getSize()/2]-power_spectrum[getSize()/2-1]) > max){
max = fabs(powerDeriv[getSize()/2] = power_spectrum[getSize()/2]-power_spectrum[getSize()/2-1]);
pos = getSize()/2;
}
return pos;
}
*/
void realFFTData::
zeroFFTData(void){
//cout<<"here"<<std::endl;
for (int i=0;i<getSize();i++)
out[i]=0.0;
}
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