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jLynx 2023-05-19 08:16:05 +12:00 • committed by GitHub
parent 7aca7ce74d
commit 033c4e9a5b
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599 changed files with 70746 additions and 66896 deletions
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73
firmware/common/dsp_iir.cpp
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@ -24,60 +24,59 @@
#include <hal.h>
void IIRBiquadFilter::configure(const iir_biquad_config_t& new_config) {
config = new_config;
config = new_config;
}
void IIRBiquadFilter::execute(const buffer_f32_t& buffer_in, const buffer_f32_t& buffer_out) {
const auto a_ = config.a;
const auto b_ = config.b;
auto x_ = x;
auto y_ = y;
const auto a_ = config.a;
const auto b_ = config.b;
// TODO: Assert that buffer_out.count == buffer_in.count.
for(size_t i=0; i<buffer_out.count; i++) {
x_[0] = x_[1];
x_[1] = x_[2];
x_[2] = buffer_in.p[i];
auto x_ = x;
auto y_ = y;
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];
// TODO: Assert that buffer_out.count == buffer_in.count.
for (size_t i = 0; i < buffer_out.count; i++) {
x_[0] = x_[1];
x_[1] = x_[2];
x_[2] = buffer_in.p[i];
buffer_out.p[i] = y_[2];
}
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];
x = x_;
y = y_;
buffer_out.p[i] = y_[2];
}
x = x_;
y = y_;
}
void IIRBiquadFilter::execute_in_place(const buffer_f32_t& buffer) {
execute(buffer, buffer);
execute(buffer, buffer);
}
void IIRBiquadDF2Filter::configure(const iir_biquad_df2_config_t& config) {
b0 = config[0] / config[3];
b1 = config[1] / config[3];
b2 = config[2] / config[3];
a1 = config[4] / config[3];
a2 = config[5] / config[3];
b0 = config[0] / config[3];
b1 = config[1] / config[3];
b2 = config[2] / config[3];
a1 = config[4] / config[3];
a2 = config[5] / config[3];
}
// scipy.signal.sosfilt
// scipy.signal.sosfilt
//
// x_n = x[i, n] # make a temporary copy
// # Use direct II transposed structure:
// x[i, n] = b[s, 0] * x_n + zi[i, s, 0]
// zi[i, s, 0] = (b[s, 1] * x_n - a[s, 0] * x[i, n] + zi[i, s, 1])
// zi[i, s, 1] = (b[s, 2] * x_n - a[s, 1] * x[i, n])
// x_n = x[i, n] # make a temporary copy
// # Use direct II transposed structure:
// x[i, n] = b[s, 0] * x_n + zi[i, s, 0]
// zi[i, s, 0] = (b[s, 1] * x_n - a[s, 0] * x[i, n] + zi[i, s, 1])
// zi[i, s, 1] = (b[s, 2] * x_n - a[s, 1] * x[i, n])
float IIRBiquadDF2Filter::execute(float x) {
float y;
y = b0 * x + z0;
z0 = b1 * x - a1 * y + z1;
z1 = b2 * x - a2 * y;
float y;
return y;
y = b0 * x + z0;
z0 = b1 * x - a1 * y + z1;
z1 = b2 * x - a2 * y;
return y;
}