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libraries/audio-tools/examples/examples-dsp/examples-maximilian/03-AM1/03-AM1.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. Amplitude modulation is when you multiply waves together. In maximilian you just use the * inbetween the two waveforms.
+
+maxiOsc mySine,myOtherSine;//Two oscillators. They can be called anything. They can be any of the available waveforms. These ones will be sinewaves
+
+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) {
+    
+    // This form of amplitude modulation is straightforward multiplication of two waveforms.
+    // Notice that the maths is different to when you add waves.
+    // The waves aren't 'beating'. Instead, the amplitude of one is modulating the amplitude of the other
+    // Remember that the sine wave has positive and negative sections as it oscillates.
+    // When you multiply something by -1, its phase is inverted but it retains its amplitude.
+    // So you hear 2 waves per second, not 1, even though the frequency is 1.
+    output[0]=mySine.sinewave(440)*myOtherSine.sinewave(1);
+    output[1]=output[0];
+}
+
+// Arduino loop
+void loop() {
+    maximilian.copy();
+}