65 lines
2.9 KiB
C
65 lines
2.9 KiB
C
/**
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* Copyright 2022 Colin Lam, Ploopy Corporation
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "user.h"
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#include "bqf.h"
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#include "run.h"
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int filter_stages = 0;
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/*****************************************************************************
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* Here is where your digital signal processing journey begins. Follow this
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* guide, and don't forget any steps!
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*
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* 1. Define the filters that you want to use. Check out "bqf.c" for a
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* complete list of what they are and how they work. Using those filters, you
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* can create ANY digital signal shape you want. Anything you can dream of.
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* 2. You're done! Enjoy the sounds of anything you want.
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****************************************************************************/
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void define_filters() {
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// First filter.
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bqf_memreset(&bqf_filters_mem_left[filter_stages]);
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bqf_memreset(&bqf_filters_mem_right[filter_stages]);
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bqf_peaking_config(SAMPLING_FREQ, 38.0, -19.0, 0.9, &bqf_filters_left[filter_stages]);
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bqf_peaking_config(SAMPLING_FREQ, 38.0, -19.0, 0.9, &bqf_filters_right[filter_stages++]);
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// Second filter.
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bqf_memreset(&bqf_filters_mem_left[filter_stages]);
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bqf_memreset(&bqf_filters_mem_right[filter_stages]);
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bqf_lowshelf_config(SAMPLING_FREQ, 2900.0, 3.0, 4.0, &bqf_filters_left[filter_stages]);
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bqf_lowshelf_config(SAMPLING_FREQ, 2900.0, 3.0, 4.0, &bqf_filters_right[filter_stages++]);
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// Third filter.
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bqf_memreset(&bqf_filters_mem_left[filter_stages]);
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bqf_memreset(&bqf_filters_mem_right[filter_stages]);
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bqf_peaking_config(SAMPLING_FREQ, 430.0, 6.0, 3.5, &bqf_filters_left[filter_stages]);
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bqf_peaking_config(SAMPLING_FREQ, 430.0, 6.0, 3.5, &bqf_filters_right[filter_stages++]);
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// Fourth filter.
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bqf_memreset(&bqf_filters_mem_left[filter_stages]);
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bqf_memreset(&bqf_filters_mem_right[filter_stages]);
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bqf_highshelf_config(SAMPLING_FREQ, 8400.0, 3.0, 4.0, &bqf_filters_left[filter_stages]);
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bqf_highshelf_config(SAMPLING_FREQ, 8400.0, 3.0, 4.0, &bqf_filters_right[filter_stages++]);
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// Fifth filter.
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bqf_memreset(&bqf_filters_mem_left[filter_stages]);
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bqf_memreset(&bqf_filters_mem_right[filter_stages]);
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bqf_peaking_config(SAMPLING_FREQ, 4800.0, 6.0, 5.0, &bqf_filters_left[filter_stages]);
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bqf_peaking_config(SAMPLING_FREQ, 4800.0, 6.0, 5.0, &bqf_filters_right[filter_stages++]);
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}
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