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GrComplexVCOMixer.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 _GRCOMPLEXVCOMIXER_H_ 00024 #define _GRCOMPLEXVCOMIXER_H_ 00025 00026 #include <VrSigProc.h> 00027 00028 template<class iType,class oType> 00029 class GrComplexVCOMixer : public VrSigProc { 00030 protected: 00031 double sensitivity; 00032 double freq; 00033 double arg; 00034 double argInc; 00035 void evaluate(int n); 00036 virtual void initialize(); 00037 public: 00038 virtual const char *name() { return "GrComplexVCOMixer"; } 00039 virtual int work(VrSampleRange output, void *ao[], 00040 VrSampleRange inputs[], void *ai[]); 00041 GrComplexVCOMixer(double f,double s) :VrSigProc(2,sizeof(iType),sizeof(oType)),sensitivity(s),freq(f),arg(0) { } 00042 }; 00043 00044 template<class iType,class oType> int 00045 GrComplexVCOMixer<iType,oType>::work(VrSampleRange output, void *ao[], 00046 VrSampleRange inputs[], void *ai[]) 00047 { 00048 iType **i = (iType**)ai; 00049 oType **o = (iType**)ao; 00050 int size = output.size; 00051 while(size -- > 0) { 00052 *o[0]++ = (oType) (*i[0] * cos(arg)); 00053 *o[1]++ = (oType) (*i[0]++ * sin(arg)); 00054 arg += argInc; 00055 argInc = 2*M_PI*(freq + sensitivity * *i[1]++)*(1 / (double)getInputSamplingFrequencyN(0)); 00056 } 00057 return output.size; 00058 } 00059 00060 template<class iType,class oType> void 00061 GrComplexVCOMixer<iType,oType>::initialize() 00062 { 00063 argInc = 2*M_PI*freq*(1 / (double)getInputSamplingFrequencyN(0)); 00064 } 00065 #endif

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