headphones/firmware/code/user.c

71 lines
3.0 KiB
C

/**
* Copyright 2022 Colin Lam, Ploopy Corporation
*
* 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
*/
#include "user.h"
#include "bqf.h"
#include "run.h"
/*****************************************************************************
* Here is where your digital signal processing journey begins. Follow this
* guide, and don't forget any steps!
*
* 1. Go to user.h and change FILTER_STAGES to the number of filter stages you
* want.
* 2. Define the filters that you want to use. Check out "bqf.c" for a
* complete list of what they are and how they work. Using those filters, you
* can create ANY digital signal shape you want. Anything you can dream of.
* 3. You're done! Enjoy the sounds of anything you want.
****************************************************************************/
void define_filters() {
// First filter.
bqf_memreset(&bqf_filters_mem_left[0]);
bqf_memreset(&bqf_filters_mem_right[0]);
bqf_peaking_config(SAMPLING_FREQ, 38.0, -22.0, 0.9, &bqf_filters_left[0]);
bqf_peaking_config(SAMPLING_FREQ, 38.0, -22.0, 0.9, &bqf_filters_right[0]);
// Second filter.
bqf_memreset(&bqf_filters_mem_left[1]);
bqf_memreset(&bqf_filters_mem_right[1]);
bqf_peaking_config(SAMPLING_FREQ, 430.0, 6.0, 3.5, &bqf_filters_left[1]);
bqf_peaking_config(SAMPLING_FREQ, 430.0, 6.0, 3.5, &bqf_filters_right[1]);
// Third filter.
bqf_memreset(&bqf_filters_mem_left[2]);
bqf_memreset(&bqf_filters_mem_right[2]);
bqf_peaking_config(SAMPLING_FREQ, 2200.0, 7.0, 4.0, &bqf_filters_left[2]);
bqf_peaking_config(SAMPLING_FREQ, 2200.0, 7.0, 4.0, &bqf_filters_right[2]);
// Fourth filter.
bqf_memreset(&bqf_filters_mem_left[3]);
bqf_memreset(&bqf_filters_mem_right[3]);
bqf_peaking_config(SAMPLING_FREQ, 3500.0, -5.0, 2.0, &bqf_filters_left[3]);
bqf_peaking_config(SAMPLING_FREQ, 3500.0, -5.0, 2.0, &bqf_filters_right[3]);
// Fifth filter.
bqf_memreset(&bqf_filters_mem_left[4]);
bqf_memreset(&bqf_filters_mem_right[4]);
bqf_peaking_config(SAMPLING_FREQ, 6800.0, -6.0, 3.0, &bqf_filters_left[4]);
bqf_peaking_config(SAMPLING_FREQ, 6800.0, -6.0, 3.0, &bqf_filters_right[4]);
// Sixth filter.
bqf_memreset(&bqf_filters_mem_left[5]);
bqf_memreset(&bqf_filters_mem_right[5]);
bqf_peaking_config(SAMPLING_FREQ, 9200.0, 3.0, 4.0, &bqf_filters_left[5]);
bqf_peaking_config(SAMPLING_FREQ, 9200.0, 3.0, 4.0, &bqf_filters_right[5]);
}