mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-23 16:37:43 +00:00
033c4e9a5b
* Updated style * Updated files * fixed new line * Updated spacing * File fix WIP * Updated to clang 13 * updated comment style * Removed old comment code
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
/*
|
|
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
|
|
*
|
|
* This file is part of PortaPack.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, Inc., 51 Franklin Street,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "dsp_iir.hpp"
|
|
|
|
#include <hal.h>
|
|
|
|
void IIRBiquadFilter::configure(const iir_biquad_config_t& 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;
|
|
|
|
// 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];
|
|
|
|
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];
|
|
|
|
buffer_out.p[i] = y_[2];
|
|
}
|
|
|
|
x = x_;
|
|
y = y_;
|
|
}
|
|
|
|
void IIRBiquadFilter::execute_in_place(const buffer_f32_t& 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];
|
|
}
|
|
|
|
// 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])
|
|
|
|
float IIRBiquadDF2Filter::execute(float x) {
|
|
float y;
|
|
|
|
y = b0 * x + z0;
|
|
z0 = b1 * x - a1 * y + z1;
|
|
z1 = b2 * x - a2 * y;
|
|
|
|
return y;
|
|
}
|