/*----------------------------------------------------------------------------------------- * Copyright (C) 2016 For the list of authors, see file AUTHORS. * * This file is part of IFOS. * * IFOS 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, version 2.0 of the License only. * * IFOS 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 IFOS. See file COPYING and/or . -----------------------------------------------------------------------------------------*/ /*------------------------------------------------------------------------ * Calculate the Hilbert transform of a signal * ----------------------------------------------------------------------*/ #include "fd.h" #include void calc_hilbert(float ** datatrace, float ** envelope, int ns, int ntr){ /* declaration of variables */ int i,j, npad, k; float *h; double npadd; /* declaration of variables for FFTW3*/ fftw_complex *in, *out; fftw_plan p; /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% */ /* calculation of the Hilbert transform */ /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% */ /* calculation of the FFT */ npad = (int)(pow(2.0, ceil(log((double)(ns))/log(2.0))+2.0) ); /* ns -> npad for usage in FFT*/ npadd = (double)npad; in = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * npad); out = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * npad); /* calculation of the vector h */ h = vector(1,npad); if ((2*(npad/2))==npad) { /* npad is even */ h[1]=1.0; h[npad/2+1]=1.0; for (i=2;i<=(npad/2);i++) { h[i] = 2.0; } } else { /* npad is odd */ h[1]=1.0; for (i=2;i<=((npad+1)/2);i++) { h[i]=2.0;} } for(k=1;k<=ntr;k++){ for (j=0;j