delay.h

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// 
// Copyright(c) 1993-1996 Tony Kirke
// author="Tony Kirke" *
/*
 * SPUC - Signal processing using C++ - A DSP library
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef DLYL
#define DLYL
namespace SPUC {





template <class Numeric> class delay 
{
 public: 
  long num_taps;
 protected:
  Numeric* z; 
      
 public: 
  delay(long n=0) : num_taps(n+1) {
        int i=0;
        z = new Numeric[num_taps];
        for (i=0;i<num_taps;i++) z[i] = 0;
  }
  delay& operator=(const delay &rhs) {
        num_taps = rhs.num_taps;
        for (int i=0;i<num_taps;i++) z[i] = rhs.z[i];
        return(*this);
  }
  ~delay(void) {        if (num_taps>0) delete [] z;}
  void reset(void) { for (int i=0;i<num_taps;i++) z[i] = 0; }
  Numeric check(long i) { return(z[i]); }
  Numeric checkback(long i) { return(z[num_taps-1-i]); }
  Numeric last() { return(z[num_taps-1]);}
  void set_size(long n=2) {
        int i=0;
        if (num_taps>0) delete [] z;
        num_taps = n+1;
        z = new Numeric[num_taps];
        for (i=0;i<num_taps;i++) z[i] = 0;
  }  
  Numeric input(Numeric in) {
        int i;                                           
        // Update history of inputs
        for (i=num_taps-1;i>0;i--) z[i] = z[i-1];  
        // Add new input
        z[0] = in;   
        return(z[num_taps-1]);
  }
  inline Numeric update(Numeric in) {
        input(in);
        return(z[num_taps-1]);
  }     
};
} // namespace SPUC 
#endif

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