filter.h

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#pragma once
#include "config.h"
#include <array>
 
// I really don't like to include this header file here, and it should not have
// been necessary if the BelaContext was not an anonymous struct (anonymous
// structs cannot be forward declared: `https://bytes.com/topic/c/answers/
// 216243-forward-declaration-typedef-unnamed-structs`).
#include <Bela.h>
 
using std::array;
class QuadBiquad;
 
const us RAW_MICT = 0;
const us RAW_MICW = 1;
const us RAW_VPU = 2;
const us RAW_IMU_ROT = 3;
const us RAW_IMU_ACC = 4;
const us RAW_PEDAL = 5;
const us NUMBER_RAW_CHANNELS = 6;
 
typedef array<float, NUMBER_RAW_CHANNELS> RawFrame;
 
 
const us FILT_RAW_MICT = 0;
const us FILT_HP8k_MICT = 1;
const us FILT_HP2k_MICT = 2;
const us FILT_LP500_MICT = 3;
 
const us FILT_RAW_MICW = 4;
const us FILT_HP8k_MICW = 5;
const us FILT_LP500_MICW = 6;
 
const us FILT_RAW_VPU = 7;
const us FILT_HP2k_VPU = 8;
const us FILT_LP500_VPU = 9;
 
const us FILT_IMU_ROT = 10;
const us FILT_HP_IMU_ACC = 11;
const us FILT_PEDAL = 12;
 
const us NUMBER_FILTERED_CHANNELS = 13;
 
 
typedef array<float, NUMBER_FILTERED_CHANNELS> FilteredFrame;
 
 
class Filter {
    QuadBiquad* _filters1; // First four biquads
    QuadBiquad* _filters2; // Second four biquads
    QuadBiquad* _filters3; // Third four biquads
  public:
    // Filter stages for biquad filters of sensors
    Filter(const float fs);
 
    void filter(const RawFrame& rawframe,FilteredFrame& filteredframe);
    ~Filter();
 
};