blob: 10db5d7ed66d07ae7919e31e4d9d56fe0e0d9f81 (
plain)
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
|
#ifndef __FILTER_H__
#define __FILTER_H__
#include "fixed.h"
/**
* A 24 dB/octave resonant low-pass filter.
**/
class LowPassFilter
{
public:
LowPassFilter();
/**
* Reset the filter - clear anything in the delay units of the filter.
*/
void reset();
void set_params(float fc, float res);
void process_sample(fixed_t* smp);
private:
float rate;
float nyquist;
double d1, d2, d3, d4;
double a0, a1, a2, b1, b2;
};
#endif
|
