Fork Code: Insects

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// Fig 50.7: Field Cricket

(
a = {
	var modulator, mod1, mod2, mod3;
	
	// repeat time is 0.7s: equates to 1.43 Hz.
	modulator = LFSaw.ar(1.43, 1, 0.5, 0.5);
	mod2 = (modulator * 40.6 * 2pi).cos.squared;
	mod3 = modulator * 3147;
	mod3 = (mod3 * 2pi).cos + ((mod3 * 2 * 2pi).cos * 0.3);
	mod1 = ((Wrap.ar(modulator.min(0.1714) * 5.84) - 0.5).squared * (-4) + 1) * (mod2 * mod3);
	mod1 = (mod1 * 0.1)!2;
}.play;
)

// To stop: 
a.free;



// Fig 50.8: Field Cricket 2

(
b = {
	var trig, seq, demand, cricket;
	
	// instead of [metro], Impulse.kr is used here. Delta t = 17 ms equates to 58.82 Hz.
	trig = Impulse.kr(58.82);
	
	// the main idea of the following line was to use an approach
	// that uses the same coefficients as described in the pd patch
	seq = Dseq(Array.fill(41, {|i| if(i<7, {(i+2)/9},{0}) }),inf);
	demand = Demand.kr(trig,0,seq);
	
	// Implementation of the pd code for pulses including amplitude grow:
	// cricket = EnvGen.ar(Env.new([0, 1, 1, 0], [0.0001, 0.0001, 0]), trig) * demand;
	
	// 2nd implementation: pure data seemed to slightly disobey its own specifications, 
	// so I analysed the waveform and came up with this:
	cricket = EnvGen.ar(Env.new([0, 1, 0], [4/44100, 0]), trig) * demand;
	
	
	cricket = OnePole.ar(cricket, exp(-2pi * (1000 * SampleDur.ir)));
	cricket = (
			// changed the Q factor of the first 3 BPFs to approximate farnells sound 
			BPF.ar(cricket, 4500 + ((0..2)*50), 300.reciprocal, 100)).sum 
			+ BPF.ar(cricket, 9000, 500.reciprocal, 42
	);		   
	cricket = ((cricket - OnePole.ar(cricket, exp(-2pi * (4000 * SampleDur.ir)))) * 0.5)!2;
}.play;
)

// To stop: 
b.free;



// Fig: 50.10: Cicada with 3 call types

(
c = {
	var sig, trig, seq, freq, mul, vals;
	
	trig = Impulse.kr(0.2);
	vals = [
		[0.5, 128],
		[8,6],
		[30,3]
	];
	freq = TChoose.kr(trig, vals);
	
			
	sig = WhiteNoise.ar;
	// The one pole filters in pure data and SC differ, so I changed the coefficents 
	// a little. Also the  multiplication by 5 is not in the book, but helps to 
	// approach the audible result of Farnells patch.
	sig = (sig - OnePole.ar(sig, exp(-2pi * (8000 * SampleDur.ir))));
	sig = (sig - OnePole.ar(sig, exp(-2pi * (8000 * SampleDur.ir))));
	sig = OnePole.ar(sig, exp(-2pi * (10000 * SampleDur.ir)));
	sig = OnePole.ar(sig, exp(-2pi * (10000 * SampleDur.ir)));
	sig = sig * 5;

		
	sig = BPF.ar(sig, [7500, 5500], 40.reciprocal).sum * SinOsc.ar(500);
	sig = sig * (1 / (SinOsc.ar( freq[0], 0, freq[1] ).squared + 1));
	sig = (sig - OnePole.ar(sig, exp(-2pi * (4000 * SampleDur.ir)))) * 4.dup;
}.play;
)

// To stop: 
c.free;



// Fig: 50.13 Direct signal implementation of housefly wing

// The adjustable parameters in the pd patch can be controlled by the mouse movement: 
// MouseX is controlling the wing-frequency, MouseY is controlling the wing-resonance.

(
SynthDef(\houseflyWing, { |out=0|
	var sig, downstroke, upstroke, wingFreq, wingRes;
	
	// this is already a preparation for fig 50.14 and is not described 
	// in the pure data patch on fig 50.13
	wingFreq = In.ar(10,2);
	wingRes = In.ar(20,2);

	// Also, it is prepared for some other input from a different source, 
	// to not only control the patch with the mouse movement. 
	// See also the following URL for more information about the next lines: 
	// http://supercollider.sourceforge.net/wiki/index.php/Boolean_logic_in_the_server 
	wingFreq = Select.ar(wingFreq > 0, [K2A.ar(MouseX.kr(0, 300)), wingFreq]);
	wingRes = Select.ar(wingRes > 0, [K2A.ar(MouseY.kr(3,5)), wingRes]);
		
	sig = LFSaw.ar(wingFreq, 1, 0.5, 0.5);
	sig = ((sig * 0.2).min(sig * (-1) + 1)).min(sig.min(sig * (-1) + 1));
	sig = (sig * 6 - 0.5) * 2; 	
	
	downstroke = (wingRes) * sig.min(0);
	downstroke = (Wrap.ar(downstroke) * 2pi).cos * sig.min(0) * 0.5 + sig.min(0);
	upstroke = sig.max(0).cubed * 2;	
		
	sig = downstroke + upstroke;	
	sig = (sig - OnePole.ar(sig, exp(-2pi * (700 * SampleDur.ir)))).dup * 0.05;
	Out.ar(out, sig);
}).add;
x = Synth(\houseflyWing);
)



// Fig: 50.14 Buzzing housefly

(
SynthDef(\buzzingHousefly, { 
	var beatingFreq, resonanceMod;
	
	beatingFreq = OnePole.ar(WhiteNoise.ar, exp(-2pi * (4 * SampleDur.ir)));
	beatingFreq = OnePole.ar(beatingFreq, exp(-2pi * (4 * SampleDur.ir)));
	beatingFreq = beatingFreq * 700 + 220;
		
	resonanceMod = OnePole.ar(WhiteNoise.ar, exp(-2pi * (5 * SampleDur.ir)));
	resonanceMod = OnePole.ar(resonanceMod, exp(-2pi * (5 * SampleDur.ir)));
	
	Out.ar(10, [beatingFreq, (resonanceMod * 3) + beatingFreq]);
	Out.ar(20, (resonanceMod * 40 + 5)!2 );	
}).add;
y = Synth(\buzzingHousefly);
)

// Now again the housefly wings are controlled by the mouse movement:
y.free;

// To stop: 
x.free;

// If the Synth(\buzzingHousefly) was executed before the Synth (\houseflyWing) you'll 
// have to execute the following line to hear the effects of the Synth(\buzzingHousefly). 
// This is because In.ar and Out.ar are used in this example to communicate between both 
// patches, and when working with In.ar it is always necessary to have the Order of 
// execution of synths on the server in mind. (see also Helpfile: Order of execution).
Synth(\buzzingHousefly, addAction: \addToHead);


// code also available here:
// http://en.wikibooks.org/wiki/Designing_Sound_in_SuperCollider/Insects
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