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// One way of thinking about FM synthesis is to see it as vibrato.
// You make a pitch, then vary it up and down at some rate.
// You can change the speed of the pitch variation (modulation frequency), and also the amount of variation (modulation index).
// In FM, usually only one of the waveforms - the carrier that provides the initial pitch - is sent to the output.
// The frequency of the the carrier wave is continually adjusted at a rate equal to the frequency of the second wave (the modulator).
// So at any given point in time, the frequency of the carrier can increase by an amount equal to the current amp of the modulator.
// This has some interesting effects.
#include "maximilian.h"
maxiOsc mySine,myOtherSine;//Two oscillators
void setup() {//some inits
//nothing to go here this time
}
void play(double *output) {
// In this example, the 'myOtherSine.sinewave' is at an amplitude of 1, it's original amplitude.
// This is pretty simple and not too useful.
//output[0]=mySine.sinewave(440*myOtherSine.sinewave(1));
// Perhaps you should comment out the above line and uncomment the below one instead
// It shows how the frequency of the carrier is altered by ADDING a second waveform to its frequency value.
// The carrier frequency is 440, and the modulation frequency is 1.
// It also shows how the modulation index works. In this case the modulation index is 100
// Try adjusting the modolation index. Also, try altering the modulation frequency.
output[0]=mySine.sinewave(440+(myOtherSine.sinewave(1)*100));
output[1]=output[0];
}
// In complex FM systems you can have lots of modulators stacked together in interesting ways, and theoretically this can make any sound.
// John Chowning is the guy you probably want to talk to about that.
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