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libraries/audio-tools/examples/examples-dsp/examples-maximilian/04-AM2/04-AM2.ino

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+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/MaximilianDSP.h"
+
+// Define Arduino output
+I2SStream out;
+Maximilian maximilian(out);
+
+//This shows how to use maximilian to do basic amplitude modulation.
+//It also shows what happens when you modulate waves with waves that have frequencies over 20 hz.
+//You start to get interesting effects.
+
+maxiOsc mySine,myOtherSine,myPhasor;//Three oscillators. They can be called anything. They can be any of the available waveforms.
+
+
+void setup() {//some inits
+  // setup logging
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  // setup Aduio output
+  auto cfg = out.defaultConfig(TX_MODE);
+  out.begin(cfg);
+  maximilian.begin(cfg);
+}
+
+void play(float *output) {
+    
+    //Using the phasor we can create a ramp, and use this ramp to set the frequency of one of the waves.
+    //When the frequency of the lower waveform passes over the threshold of 20hz, we start to hear two new waveforms.
+    //The frequency of the first new wave is the sum of the two original waves.
+    //The frequency of the second new wave is the difference of the two original waves.
+    //So you hear two new waves, one going up, one going down.
+    
+    output[0]=mySine.sinewave(440)*myOtherSine.sinewave(myPhasor.phasorBetween(0.01,0,440));
+    output[1]=output[0];
+   
+}
+
+// Arduino loop
+void loop() {
+    maximilian.copy();
+}