mirror of
https://github.com/eried/portapack-mayhem.git
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67 lines
2.6 KiB
C++
67 lines
2.6 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2017 Furrtek
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* Copyright (C) 2024 Mark Thompson
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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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#include "tone_gen.hpp"
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#include "sine_table_int8.hpp"
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// Functions for audio beep (used by Sonde RSSI)
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void ToneGen::configure_beep(const uint32_t freq, const uint32_t sample_rate) {
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f_delta_ = (float)(freq * sizeof(sine_table_i8)) / sample_rate;
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f_tone_phase_ = 0.0;
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// For higher frequencies, start at sine peak to handle case of freq=sample_rate/2;
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// we don't want to sample the sine wave only when it's crossing 0!
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// There is still an amplitude issue though depending on magnitude of selected sine sample deltas.
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if (f_delta_ >= sizeof(sine_table_i8) / 4)
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f_tone_phase_ = sizeof(sine_table_i8) / 4;
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}
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int16_t ToneGen::process_beep() {
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int16_t tone_sample = sine_table_i8[(uint32_t)f_tone_phase_ & 0xFF] * 256;
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f_tone_phase_ += f_delta_;
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return tone_sample;
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}
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// ----Original available core SW code from fw 1.3.1 , Working also well in Mic App CTCSS Gen from fw 1.4.0 onwards
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// Original direct-look-up synthesis algorithm with Fractional delta phase. It is OK
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// Delta and Accumulator fase are stored in 32 bits (4 bytes), 1st top byte used as Modulo-256 Sine look-up table [index]
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// the lower 3 bytes (24 bits) are used as a Fractional Detla and Accumulator phase, to have very finer Fstep control.
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void ToneGen::configure(const uint32_t delta, const float tone_mix_weight) {
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delta_ = delta;
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tone_phase_ = 0;
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tone_mix_weight_ = tone_mix_weight;
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input_mix_weight_ = 1.0 - tone_mix_weight;
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}
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int32_t ToneGen::process(const int32_t sample_in) {
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if (!delta_)
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return sample_in;
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int32_t tone_sample = sine_table_i8[(tone_phase_ & 0xFF000000U) >> 24];
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tone_phase_ += delta_;
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return (sample_in * input_mix_weight_) + (tone_sample * tone_mix_weight_);
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} |