iir_hpc.h

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// 
// Copyright(c) 1993-1996 Tony Kirke
// author="Tony Kirke" *
/* Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  This software is provided "as is" 
 * without express or implied warranty.
*/
#ifndef IIR1STHC
#define IIR1STHC
namespace SPUC {
//
template <class Numeric> class iir_hpc
{
    protected:   
        double gain;                    
        double coeff;                    
        Numeric out;
        Numeric previous_out;
                Numeric previous_in;
        
    public:
        iir_hpc(double A=0) {
                  set_coeff(A);
                  previous_in = previous_out = out = 0 ; 
                }
                void set_coeff(double A) { 
                  coeff=A;
                  gain=2.0/(1+coeff);
                }
                iir_hpc(const char* file)
                  {
                        FILE *iirf = fopen(file,"r"); 
                        fscanf(iirf,"%lf",&coeff);
                        fclose(iirf);
                        previous_in = previous_out = out = 0;
                        set_coeff(coeff);
                  }             
                void print() {printf("IIR Coefficient gain = %lf\n",gain);}
                Numeric clock(Numeric input) {
                  out += (input-coeff*previous_in);
                  previous_in = input;
                  return(gain*out);
                }
                void reset() {
                  previous_in = previous_out = out = 0;
                }
};       
} // namespace SPUC
#endif

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