133 lines
4.1 KiB
C++
Executable file
133 lines
4.1 KiB
C++
Executable file
/* Audio Library for Teensy 3.X
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* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
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*
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* Development of this audio library was funded by PJRC.COM, LLC by sales of
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* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
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* open source software by purchasing Teensy or other PJRC products.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice, development funding notice, and this permission
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* notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef synth_sine_h_
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#define synth_sine_h_
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#include "Arduino.h"
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#include "AudioStream.h"
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#include "arm_math.h"
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// TODO: investigate making a high resolution sine wave
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// using Taylor series expansion.
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// http://www.musicdsp.org/showone.php?id=13
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class AudioSynthWaveformSine : public AudioStream
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{
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public:
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AudioSynthWaveformSine() : AudioStream(0, NULL), magnitude(16384) {}
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void frequency(float freq) {
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if (freq < 0.0) freq = 0.0;
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else if (freq > AUDIO_SAMPLE_RATE_EXACT/2) freq = AUDIO_SAMPLE_RATE_EXACT/2;
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phase_increment = freq * (4294967296.0 / AUDIO_SAMPLE_RATE_EXACT);
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}
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void phase(float angle) {
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if (angle < 0.0) angle = 0.0;
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else if (angle > 360.0) {
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angle = angle - 360.0;
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if (angle >= 360.0) return;
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}
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phase_accumulator = angle * (4294967296.0 / 360.0);
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}
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void amplitude(float n) {
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if (n < 0) n = 0;
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else if (n > 1.0) n = 1.0;
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magnitude = n * 65536.0;
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}
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virtual void update(void);
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private:
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uint32_t phase_accumulator;
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uint32_t phase_increment;
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int32_t magnitude;
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};
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class AudioSynthWaveformSineHires : public AudioStream
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{
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public:
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AudioSynthWaveformSineHires() : AudioStream(0, NULL), magnitude(16384) {}
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void frequency(float freq) {
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if (freq < 0.0) freq = 0.0;
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else if (freq > AUDIO_SAMPLE_RATE_EXACT/2) freq = AUDIO_SAMPLE_RATE_EXACT/2;
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phase_increment = freq * (4294967296.0 / AUDIO_SAMPLE_RATE_EXACT);
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}
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void phase(float angle) {
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if (angle < 0.0) angle = 0.0;
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else if (angle > 360.0) {
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angle = angle - 360.0;
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if (angle >= 360.0) return;
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}
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phase_accumulator = angle * (4294967296.0 / 360.0);
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}
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void amplitude(float n) {
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if (n < 0) n = 0;
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else if (n > 1.0) n = 1.0;
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magnitude = n * 65536.0;
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}
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virtual void update(void);
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private:
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uint32_t phase_accumulator;
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uint32_t phase_increment;
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int32_t magnitude;
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};
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class AudioSynthWaveformSineModulated : public AudioStream
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{
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public:
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AudioSynthWaveformSineModulated() : AudioStream(1, inputQueueArray), magnitude(16384) {}
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// maximum unmodulated carrier frequency is 11025 Hz
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// input = +1.0 doubles carrier
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// input = -1.0 DC output
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void frequency(float freq) {
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if (freq < 0.0) freq = 0.0;
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else if (freq > AUDIO_SAMPLE_RATE_EXACT/4) freq = AUDIO_SAMPLE_RATE_EXACT/4;
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phase_increment = freq * (4294967296.0 / AUDIO_SAMPLE_RATE_EXACT);
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}
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void phase(float angle) {
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if (angle < 0.0) angle = 0.0;
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else if (angle > 360.0) {
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angle = angle - 360.0;
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if (angle >= 360.0) return;
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}
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phase_accumulator = angle * (4294967296.0 / 360.0);
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}
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void amplitude(float n) {
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if (n < 0) n = 0;
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else if (n > 1.0) n = 1.0;
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magnitude = n * 65536.0;
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}
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virtual void update(void);
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private:
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uint32_t phase_accumulator;
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uint32_t phase_increment;
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audio_block_t *inputQueueArray[1];
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int32_t magnitude;
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};
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#endif
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