comb.h

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// Comb filter class
//
// Written by Jezar at Dreampoint, June 2000
// http://www.dreampoint.co.uk
// This code is public domain

#ifndef _comb_
#define _comb_

#include "denormals.h"

class comb
{
public:
 comb()
  {
   filterstore = 0;
   bufidx = 0;
  }
 void setbuffer(float *buf, int size)
  {
   buffer = buf;
   bufsize = size;
  }
 __forceinline  float process(float input)
  {
   float output;

   output = buffer[bufidx];
   undenormalise(output);

   filterstore = (output*damp2) + (filterstore*damp1);
   undenormalise(filterstore);

   buffer[bufidx] = input + (filterstore*feedback);

   if(++bufidx>=bufsize) bufidx = 0;

   return output;
  }
 void mute()
  {
   for (int i=0; i<bufsize; i++)
    buffer[i]=0;
  }
 void setdamp(float val)
  {
   damp1 = val;
   damp2 = 1-val;
  }
 float getdamp()
  {
   return damp1;
  }
 void setfeedback(float val)
  {
   feedback = val;
  }
 float getfeedback()
  {
   return feedback;
  }
private:
 float   feedback;
 float   filterstore;
 float   damp1;
 float   damp2;
 float   *buffer;
 int     bufsize;
 int     bufidx;
};

#endif //_comb_

//ends