Example 3

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Revision as of 01:04, 15 January 2013 by Dtrueman (talk | contribs) (SuperCollider code)

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FM synthesis:

ChucK code

SinOsc c => Gain amp => dac; // carrier
SinOsc m => blackhole; // modulator 
0.3 => amp.gain;
550 => float mf => m.freq;
300 => float cf => c.freq;
2 => float index;

while( true )
    cf + (index * mf * m.last()) => c.freq;
    1::samp => now;

SuperCollider code

	var cf, mf, index;
	cf = 300;
	mf = 550;
	index = 2;
	SinOsc.ar(cf + SinOsc.ar(mf, mul: mf * index), mul: 0.3).dup // .dup = duplicate = cheap stereo

SC actually has a PM UGen (Phase Modulation synthesis and Frequency Modulation synthesis are basically the same sound), so this example could also look like this:


from DT here: this is super cool Jascha! there is also a ChucK FM synthesis ugen:


from JN: neat-o - this should totally be added to the ChucK code section as an alternative approach. i couldn't immediately see how to use it - can you post an example?

from DT: well, FM by itself doesn't actually work, which is silly (it's meant to be a superclass only), but ChucK is full of silliness. however, FM synthesis is possible very simply and efficiently using the .sync method, which many UGENS have, and which tells the UGEN how to interpret its input. so, here's a very simple example, from the ChucK examples:

SinOsc m => SinOsc c => dac;

550 => float mf => m.freq;
300 => float cf => c.freq;
2 => float index;
index * mf => m.gain;
2 => c.sync; //sync mode 2 tells SinOsc to interpret input as offset to the internal frequency cf
while( true ) 1::second => now;