00001 /* Copyright 2001,2002 Matt Flax <flatmax@ieee.org> 00002 This file is part of the MFFM FFTw Wrapper library. 00003 00004 MFFM MFFM FFTw Wrapper library is free software; you can 00005 redistribute it and/or modify 00006 it under the terms of the GNU General Public License as published by 00007 the Free Software Foundation; either version 2 of the License, or 00008 (at your option) any later version. 00009 00010 MFFM FFTw Wrapper library is distributed in the hope that it will be useful, 00011 but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 GNU General Public License for more details. 00014 00015 You have received a copy of the GNU General Public License 00016 along with the MFFM FFTw Wrapper library 00017 */ 00018 #ifndef REALFFTDATA_H_ 00019 #define REALFFTDATA_H_ 00020 00021 #include "realFFT.H" 00022 #include <fftw3.h> 00023 00024 #include <iostream> 00025 using namespace std; 00026 00027 #ifndef fftw_real 00028 #define fftw_real double 00029 #endif 00030 00031 /// class realFFTData controls and manipulates fft data 00032 class realFFTData { 00033 /// Var used to specify if the memory was allocated by the realFFTData class 00034 int deleteInOutMemory; 00035 public: 00036 /// Specifies the size of the data array 00037 int size; 00038 /// Specifies the minimum and maximum power bins as used in the methods findMaxMinPowerBins and compPowerSpec 00039 int minPowerBin, maxPowerBin; 00040 /// the input, output and power_spectrum arrays 00041 fftw_real *in, *out, *power_spectrum; //, *powerDeriv; power deriv. removed for now 00042 /// The total power (summed) of the power spectrum as used in the method compPowerSpec 00043 double totalPower; 00044 00045 /// All memory to be allocated internally 00046 realFFTData(int sz); 00047 /// input and output data arrays are to be allocated by another process 00048 realFFTData(int sz, fftw_real*inp, fftw_real*outp); 00049 /// Deconstructor 00050 ~realFFTData(void); 00051 00052 /// Limits the maximum to 'lim' and returns the last fft bin with max 00053 int limitHalfPowerSpec(double lim); 00054 00055 /// Returns the number of elements in the input and output arrays 00056 int getSize(void){return size;} 00057 /// Returns the number of elements in the power spectrum array 00058 int getHalfSize(void){ if (!(size%2)) return size/2; else return size/2+1;} 00059 00060 /// Returns the maximum input variable 00061 fftw_real findMaxIn(void); 00062 /// Fills the max and min power spectrum bins 00063 void findMaxMinPowerBins(void); 00064 00065 /// This function computes the power spectrum and returns the max bin 00066 int compPowerSpec(); 00067 /// This function computes the square root of the power spectrum and returns the max bin 00068 int sqrtPowerSpec(); 00069 00070 // int powerSpecDeriv(); // Find the derivative of the power spectrum 00071 00072 /// This function zeros the output data array (out) 00073 void zeroFFTData(void); 00074 }; 00075 #endif // REALFFTDATA_H_
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