Qucs-core  0.0.19
fourier.h
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00001 /*
00002  * fourier.h - fourier transformation class definitions
00003  *
00004  * Copyright (C) 2005, 2006, 2009 Stefan Jahn <stefan@lkcc.org>
00005  *
00006  * This is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 2, or (at your option)
00009  * any later version.
00010  *
00011  * This software is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  * GNU General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU General Public License
00017  * along with this package; see the file COPYING.  If not, write to
00018  * the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
00019  * Boston, MA 02110-1301, USA.
00020  *
00021  * $Id$
00022  *
00023  */
00024 
00025 #ifndef __FOURIER_H__
00026 #define __FOURIER_H__
00027 
00028 namespace qucs {
00029 
00030 class vector;
00031 
00032 namespace fourier {
00033 
00034   // public functions
00035   qucs::vector  fft_1d (qucs::vector, int isign = 1);
00036   qucs::vector ifft_1d (qucs::vector);
00037   qucs::vector  dft_1d (qucs::vector, int isign = 1);
00038   qucs::vector idft_1d (qucs::vector);
00039 
00040   // additional public function
00041   qucs::vector fftshift (qucs::vector);
00042 
00043   // internal functions
00044   void  _fft_1d (nr_double_t *, int, int isign = 1);
00045   void _ifft_1d (nr_double_t *, int);
00046   void  _dft_1d (nr_double_t *, int, int isign = 1);
00047   void _idft_1d (nr_double_t *, int);
00048 
00049   void  _fft_1d_2r (nr_double_t *, nr_double_t *, int);
00050   void _ifft_1d_2r (nr_double_t *, nr_double_t *, int);
00051 
00052   void  _fft_nd (nr_double_t *, int[], int, int isign = 1);
00053   void _ifft_nd (nr_double_t *, int[], int);
00054 
00055 } // namespace
00056 
00057 } // namespace qucs
00058 
00059 #endif /* __FOURIER_H__ */