mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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61 lines
2.2 KiB
C++
61 lines
2.2 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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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 2, or (at your option)
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* 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; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __DSP_IIR_CONFIG_H__
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#define __DSP_IIR_CONFIG_H__
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#include "dsp_iir.hpp"
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// scipy.signal.butter(2, 30 / 24000.0, 'highpass', analog=False)
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constexpr iir_biquad_config_t audio_48k_hpf_30hz_config {
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{ 0.99722705f, -1.99445410f, 0.99722705f },
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{ 1.00000000f, -1.99444641f, 0.99446179f }
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};
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// scipy.signal.butter(2, 300 / 24000.0, 'highpass', analog=False)
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constexpr iir_biquad_config_t audio_48k_hpf_300hz_config {
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{ 0.97261390f, -1.94522780f, 0.97261390f },
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{ 1.00000000f, -1.94447766f, 0.94597794f }
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};
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// scipy.signal.iirdesign(wp=8000 / 24000.0, ws= 4000 / 24000.0, gpass=1, gstop=18, ftype='ellip')
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constexpr iir_biquad_config_t non_audio_hpf_config {
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{ 0.51891061f, -0.95714180f, 0.51891061f },
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{ 1.0f , -0.79878302f, 0.43960231f }
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};
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// scipy.signal.butter(1, 300 / 24000.0, 'lowpass', analog=False)
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// NOTE: Technically, order-1 filter, b[2] = a[2] = 0.
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constexpr iir_biquad_config_t audio_48k_deemph_300_6_config {
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{ 0.01925927f, 0.01925927f, 0.00000000f },
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{ 1.00000000f, -0.96148145f, 0.00000000f }
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};
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// 75us RC time constant, used in broadcast FM in Americas, South Korea
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// scipy.signal.butter(1, 2122 / 24000.0, 'lowpass', analog=False)
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// NOTE: Technically, order-1 filter, b[2] = a[2] = 0.
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constexpr iir_biquad_config_t audio_48k_deemph_2122_6_config {
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{ 0.12264116f, 0.12264116f, 0.00000000f },
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{ 1.00000000f, -0.75471767f, 0.00000000f }
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};
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#endif/*__DSP_IIR_CONFIG_H__*/
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