38 lines
1.4 KiB
C++
Executable File
38 lines
1.4 KiB
C++
Executable File
#include "AudioTools.h"
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#include "AudioTools/AudioLibs/MaximilianDSP.h"
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// Define Arduino output
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I2SStream out;
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Maximilian maximilian(out);
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//This shows how to use maximilian to do basic amplitude modulation. Amplitude modulation is when you multiply waves together. In maximilian you just use the * inbetween the two waveforms.
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maxiOsc mySine,myOtherSine;//Two oscillators. They can be called anything. They can be any of the available waveforms. These ones will be sinewaves
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void setup() {//some inits
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// setup logging
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Serial.begin(115200);
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AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
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// setup Aduio output
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auto cfg = out.defaultConfig(TX_MODE);
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out.begin(cfg);
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maximilian.begin(cfg);
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}
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void play(float *output) {
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// This form of amplitude modulation is straightforward multiplication of two waveforms.
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// Notice that the maths is different to when you add waves.
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// The waves aren't 'beating'. Instead, the amplitude of one is modulating the amplitude of the other
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// Remember that the sine wave has positive and negative sections as it oscillates.
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// When you multiply something by -1, its phase is inverted but it retains its amplitude.
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// So you hear 2 waves per second, not 1, even though the frequency is 1.
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output[0]=mySine.sinewave(440)*myOtherSine.sinewave(1);
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output[1]=output[0];
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}
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// Arduino loop
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void loop() {
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maximilian.copy();
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} |