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running_average.h

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00001 // 
00002 // Copyright(c) 1993-1996 Tony Kirke
00003 // author="Tony Kirke" *
00004 /*
00005  * SPUC - Signal processing using C++ - A DSP library
00006  * 
00007  * This program 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  * This program 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 this program; if not, write to the Free Software
00019  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00020 */
00021 #ifndef RUNAV
00022 #define RUNAV
00023 #include <delay.h>
00024 namespace SPUC {
00028 
00029 
00030 
00031 
00032 template <class Numeric> class running_average
00033 {
00034     protected:
00035         Numeric result;
00036     delay<Numeric>* z; 
00037         long size;
00038       
00039 public: 
00041         running_average(long n=0) : z(NULL) {
00042           int i=0;
00043           size = n;
00044           if (n>1) {
00045                 z = new delay<Numeric>(n-1);
00046                 z->reset();
00047           }
00048           result = 0;
00049         }
00051         running_average& operator=(const running_average &rhs) {
00052           z = rhs.z;
00053           result = rhs.result;
00054           return(*this);
00055         }
00057         void set_size(long n) {
00058           if (z) delete z;
00059           else {
00060                 z = new delay<Numeric>(n-1);
00061                 result = 0;
00062                 size = n;
00063           }
00064         }
00066         ~running_average(void) { if (z) delete z;}
00068         void reset(void) { z->reset(); result = 0;}
00070         Numeric get_result() { return(result);}
00072         Numeric update(Numeric in) {
00073                 result -= z->last();
00074                 z->input(in);
00075                 result += in;
00076                 return(result);
00077         }
00078 };
00079 } // namespace SPUC 
00080 #endif

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