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jLynx 2023-05-19 08:16:05 +12:00 • committed by GitHub
parent 7aca7ce74d
commit 033c4e9a5b
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77
firmware/common/dsp_iir.hpp
View file

@ -27,64 +27,61 @@
#include "dsp_types.hpp"
struct iir_biquad_config_t {
std::array<float, 3> b;
std::array<float, 3> a;
std::array<float, 3> b;
std::array<float, 3> a;
};
// 0..2 - b, 3..5 - a
typedef std::array<float, 6> iir_biquad_df2_config_t;
constexpr iir_biquad_config_t iir_config_passthrough {
{ { 1.0f, 0.0f, 0.0f } },
{ { 0.0f, 0.0f, 0.0f } },
constexpr iir_biquad_config_t iir_config_passthrough{
{{1.0f, 0.0f, 0.0f}},
{{0.0f, 0.0f, 0.0f}},
};
constexpr iir_biquad_config_t iir_config_no_pass {
{ { 0.0f, 0.0f, 0.0f } },
{ { 0.0f, 0.0f, 0.0f } },
constexpr iir_biquad_config_t iir_config_no_pass{
{{0.0f, 0.0f, 0.0f}},
{{0.0f, 0.0f, 0.0f}},
};
class IIRBiquadFilter {
public:
// http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt
constexpr IIRBiquadFilter(
) : IIRBiquadFilter(iir_config_no_pass)
{
}
public:
// http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt
constexpr IIRBiquadFilter()
: IIRBiquadFilter(iir_config_no_pass) {
}
// Assume all coefficients are normalized so that a0=1.0
constexpr IIRBiquadFilter(
const iir_biquad_config_t& config
) : config(config)
{
}
// Assume all coefficients are normalized so that a0=1.0
constexpr IIRBiquadFilter(
const iir_biquad_config_t& config)
: config(config) {
}
void configure(const iir_biquad_config_t& new_config);
void configure(const iir_biquad_config_t& new_config);
void execute(const buffer_f32_t& buffer_in, const buffer_f32_t& buffer_out);
void execute_in_place(const buffer_f32_t& buffer);
void execute(const buffer_f32_t& buffer_in, const buffer_f32_t& buffer_out);
void execute_in_place(const buffer_f32_t& buffer);
private:
iir_biquad_config_t config;
std::array<float, 3> x { { 0.0f, 0.0f, 0.0f } };
std::array<float, 3> y { { 0.0f, 0.0f, 0.0f } };
private:
iir_biquad_config_t config;
std::array<float, 3> x{{0.0f, 0.0f, 0.0f}};
std::array<float, 3> y{{0.0f, 0.0f, 0.0f}};
};
class IIRBiquadDF2Filter {
public:
public:
void configure(const iir_biquad_df2_config_t& config);
float execute(float z);
void configure(const iir_biquad_df2_config_t& config);
float execute(float z);
private:
float b0 = 0;
float b1 = 0;
float b2 = 0;
float a1 = 0;
float a2 = 0;
private:
float b0 = 0;
float b1 = 0;
float b2 = 0;
float a1 = 0;
float a2 = 0;
float z0 = 0;
float z1 = 0;
float z0 = 0;
float z1 = 0;
};
#endif/*__DSP_IIR_H__*/
#endif /*__DSP_IIR_H__*/