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OpenAudio_ArduinoLibrary/synth_sine_f32.h

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1.8 KiB

/*
* AdioSynthWaveformSine_F32
*
* Created: Chip Audette (OpenAudio) Feb 2017
* Modeled on: AudioSynthWaveformSine from Teensy Audio Library
*
* Purpose: Create sine wave of given amplitude and frequency
*
* License: MIT License. Use at your own risk.
*
*/
#ifndef synth_sine_f32_h_
#define synth_sine_f32_h_
#include "Arduino.h"
#include "AudioStream_F32.h"
#include "arm_math.h"
class AudioSynthWaveformSine_F32 : public AudioStream_F32
{
//GUI: inputs:0, outputs:1 //this line used for automatic generation of GUI node
//GUI: shortName:sine //this line used for automatic generation of GUI node
public:
AudioSynthWaveformSine_F32() : AudioStream_F32(0, NULL), magnitude(16384) { } //uses default AUDIO_SAMPLE_RATE from AudioStream.h
AudioSynthWaveformSine_F32(const AudioSettings_F32 &settings) : AudioStream_F32(0, NULL), magnitude(16384) {
setSampleRate_Hz(settings.sample_rate_Hz);
}
void frequency(float freq) {
if (freq < 0.0) freq = 0.0;
else if (freq > sample_rate_Hz/2.f) freq = sample_rate_Hz/2.f;
phase_increment = freq * (4294967296.0 / sample_rate_Hz);
}
void phase(float angle) {
if (angle < 0.0f) angle = 0.0f;
else if (angle > 360.0f) {
angle = angle - 360.0f;
if (angle >= 360.0f) return;
}
phase_accumulator = angle * (4294967296.0f / 360.0f);
}
void amplitude(float n) {
if (n < 0) n = 0;
else if (n > 1.0f) n = 1.0f;
magnitude = n * 65536.0f;
}
void setSampleRate_Hz(const float &fs_Hz) {
phase_increment *= sample_rate_Hz / fs_Hz; //change the phase increment for the new frequency
sample_rate_Hz = fs_Hz;
}
void begin(void) { enabled = true; }
void end(void) { enabled = false; }
virtual void update(void);
private:
uint32_t phase_accumulator = 0;
uint32_t phase_increment = 0;
int32_t magnitude = 0;
float sample_rate_Hz = AUDIO_SAMPLE_RATE;
volatile uint8_t enabled = 1;
};
#endif