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Refactor IIRBiquadFilter to separate configuration structure.

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This commit is contained in:
Jared Boone 2015-08-04 15:00:38 -07:00
parent 76df4f0369
commit caef87fe90
2 changed files with 24 additions and 24 deletions
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18
firmware/baseband/dsp_iir.hpp
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@ -26,16 +26,19 @@
#include "dsp_types.hpp"
struct iir_biquad_config_t {
const std::array<float, 3> b;
const std::array<float, 3> a;
};
class IIRBiquadFilter {
public:
// http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt
// Assume all coefficients are normalized so that a0=1.0
constexpr IIRBiquadFilter(
std::array<float, 3> b,
std::array<float, 3> a
) : b(b),
a(a)
const iir_biquad_config_t& config
) : config(config)
{
}
@ -51,8 +54,7 @@ public:
}
private:
const std::array<float, 3> b;
const std::array<float, 3> a;
const 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 } };
@ -63,8 +65,8 @@ private:
y[0] = y[1];
y[1] = y[2];
y[2] = b[0] * x[2] + b[1] * x[1] + b[2] * x[0]
- a[1] * y[1] - a[2] * y[0];
y[2] = config.b[0] * x[2] + config.b[1] * x[1] + config.b[2] * x[0]
- config.a[1] * y[1] - config.a[2] * y[0];
return y[2];
}