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GrHilbert.h

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00001 /* -*- Mode: c++ -*- */
00002 /*
00003  * Copyright 2001 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio
00006  * 
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00020  * Boston, MA 02111-1307, USA.
00021  */
00022 
00023 
00024 #ifndef _GRHILBERT_H_
00025 #define _GRHILBERT_H_
00026 
00027 #include <VrHistoryProc.h>
00028 #include <VrComplex.h>
00029 #include <gr_fir.h>
00030 #include <gr_firdes.h>
00031 
00032 template<class iType> 
00033 class GrHilbert : public VrHistoryProc<iType,VrComplex> {
00034 private:
00035   gr_fir<float,iType,float> hilb;
00036   unsigned int taps;
00037 public: 
00038   virtual const char *name() { return "GrHilbert"; }
00039   virtual int work(VrSampleRange output, void *o[],
00040                    VrSampleRange inputs[], void *i[]);
00041   GrHilbert(unsigned int taps);
00042 };
00043 
00044 template<class iType> int
00045 GrHilbert<iType>::work(VrSampleRange output, void *ao[],
00046                               VrSampleRange inputs[], void *ai[])
00047 {
00048   iType **i = (iType **)ai;
00049   VrComplex **o = (VrComplex **)ao;
00050   int size = output.size;
00051   for(int x = 0; x<size; x++)
00052     {
00053       o[0][x].real(i[0][x+taps/2]);
00054       o[0][x].imag(hilb.filter(&i[0][x]));
00055     }
00056   return output.size;
00057 }
00058 
00059 template<class iType> 
00060 GrHilbert<iType>::GrHilbert(unsigned int taps)
00061   : VrHistoryProc<iType,VrComplex>(1), 
00062     hilb(gr_firdes::hilbert(taps)),taps(taps)
00063 { 
00064   history = taps;
00065 }
00066 #endif

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