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GrMixer.h

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00001 /* -*- c++ -*- */ 00002 /* 00003 * Copyright 2002 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 #ifndef _GRMIXER_H_ 00024 #define _GRMIXER_H_ 00025 00026 #include <VrSigProc.h> 00027 #include <gr_nco.h> 00028 00029 template<class iType,class oType> 00030 class GrMixer : public VrSigProc { 00031 00032 public: 00033 GrMixer(double carrier_freq, double gain) 00034 : VrSigProc(1,sizeof(iType), sizeof(oType)), 00035 carrier_freq (carrier_freq), gain (gain) {} 00036 00037 const char *name() { return "GrMixer"; } 00038 00039 int work (VrSampleRange output, void *ao[], 00040 VrSampleRange inputs[], void *ai[]); 00041 00042 00043 protected: 00044 00045 void initialize (); 00046 00047 double carrier_freq; 00048 double gain; 00049 gr_nco<float,float> nco; 00050 }; 00051 00052 template<class iType,class oType> void 00053 GrMixer<iType,oType>::initialize () 00054 { 00055 double Fs = getSamplingFrequency (); 00056 nco.set_freq (carrier_freq / Fs * 2 * M_PI); 00057 nco.set_phase (0); 00058 } 00059 00060 template<class iType,class oType> 00061 int 00062 GrMixer<iType,oType>::work (VrSampleRange output, void *ao[], 00063 VrSampleRange inputs[], void *ai[]) 00064 { 00065 iType *in = ((iType**) ai)[0]; 00066 oType *out = ((iType**) ao)[0]; 00067 00068 sync (output.index); // we've got state, must compute in order 00069 00070 for (unsigned oo = 0; oo < output.size; oo++){ 00071 out[oo] = (oType) (gain * in[oo] * nco.sin ()); 00072 nco.step (); 00073 } 00074 00075 return output.size; 00076 } 00077 00078 00079 #endif /* _GRMIXER_H_ */

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