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// Comb filter class declaration
//
// Written by Jezar at Dreampoint, June 2000
// http://www.dreampoint.co.uk
// This code is public domain
#ifndef _comb_
#define _comb_
#include "denormals.h"
//---------------------------------------------------------
// comb
//---------------------------------------------------------
class comb
{
float feedback;
float filterstore;
float damp1;
float damp2;
float *buffer;
int bufsize;
int bufidx;
public:
comb() {
filterstore = 0;
bufidx = 0;
}
void setbuffer(float *buf, int size) {
buffer = buf;
bufsize = size;
}
float process(float input) {
float output = buffer[bufidx];
undenormalise(output);
filterstore = (output*damp2) + (filterstore*damp1);
undenormalise(filterstore);
buffer[bufidx] = input + (filterstore*feedback);
if (++bufidx >= bufsize)
bufidx = 0;
// bufidx = ++bufidx % bufsize;
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; }
};
// Big to inline - but crucial for speed
#endif //_comb_
//ends
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