1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
// 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"
/**
* Combination filter
*Takes multiple audio channels and mix them for one ear
*/
class comb
{
public:
comb();
void setbuffer(float *buf, int size);
inline float process(float inp);
void mute();
void setdamp(float val);
float getdamp();
void setfeedback(float val);
float getfeedback();
private:
float feedback;
float filterstore;
float damp1;
float damp2;
float *buffer;
int bufsize;
int bufidx;
};
// Big to inline - but crucial for speed
inline float comb::process(float input)
{
/* FIXME
* comb::process is not really ear-friendly the tunning values must
* be changed*/
float output;
output = undenormalise( buffer[bufidx] );
filterstore = undenormalise(output*damp2);
buffer[bufidx] = input + filterstore*feedback;
if(++bufidx>=bufsize) bufidx = 0;
return output;
}
#endif //_comb_
//ends
|
