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GrAGC.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 
00024 #ifndef _GRAGC_H_
00025 #define _GRAGC_H_
00026 
00027 #include <VrSigProc.h>
00028 
00029 template<class iType,class oType> 
00030 class GrAGC : public VrSigProc {
00031 protected:
00032   double k;
00033   double power;
00034   virtual void initialize();
00035 public: 
00036   virtual const char *name() { return "GrAGC"; }
00037   virtual int work(VrSampleRange output, void *ao[],
00038                    VrSampleRange inputs[], void *ai[]);
00039   GrAGC(double k):VrSigProc(1,sizeof(iType),sizeof(oType)),k(k) { }
00040 };
00041 
00042 template<class iType,class oType> int
00043 GrAGC<iType,oType>::work(VrSampleRange output, void *ao[],
00044                 VrSampleRange inputs[], void *ai[])
00045 {
00046   iType **i = (iType **)ai;
00047   oType **o = (oType **)ao;
00048   double inv_gain;
00049   int size = output.size;
00050   while(size -- > 0) {
00051     power = power + ((*i[0] * *i[0]) - power)/k;
00052     inv_gain = sqrt(power);
00053     *o[0]++ = (*i[0]++ / inv_gain);
00054   }
00055   return output.size;
00056 }
00057 
00058 template<class iType,class oType> void
00059 GrAGC<iType,oType>::initialize()  
00060 {
00061   power = 1;
00062 }
00063 #endif

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