allpass_iir.h

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// 
// author="Tony Kirke"
// Copyright(c) 1993-1996 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 ALLPASS_IIR
#define ALLPASS_IIR
#include "allpass_1.h"
namespace SPUC {










template <class Numeric> class allpass_iir
{
    protected:   
                allpass_1<Numeric> A0,A1;
                delay<Numeric> dly;
                long delay_size;
       
    public:
        allpass_iir(Numeric c0, Numeric c1, long delay=2) 
                        : A0(c0,delay), A1(c1,delay), delay_size(delay)
                { 
                        dly.set_size(delay);
                }
                void reset() { dly.reset(); A0.reset(), A1.reset() }
           
                Numeric clock(Numeric input) {
                  Numeric out0,out1;

                  dly.input(input);
                  out0 = A0.clock(input);
                  out1 = A1.clock(dly.check(delay_size/2));
                  return(0.5*(out0 + out1));
                  // Complimentary filter return(0.5*(out0 - out1));
                }
};                                               
} // namespace SPUC 
#endif

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