«Sick LinCong» by clicksonnil

on 08 Sep'11 05:57 in noiselinearnonlinearrandom number generator

Use of linear congruence and multiply with carry random number generators for non-realtime signal generation. Very noisy outputs, watch your ears! (you'll need to change the file write path to one valid for your machine)

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//Linear congruence random number generator
(
var file,data; 
var sr=44100; 
var last = 0.13154617451; 
var options = Array.rand(80,0.01,0.99); 
var mult= 1.02; 
var changechance = 0.0005; 

file = SoundFile.new.headerFormat_("WAV").sampleFormat_("int16").numChannels_(1).sampleRate_(sr);

file.openWrite("/Users/nickcollins/Desktop/writetest.wav");

data = Signal.fill(sr*10, {|i|  
	
	var next = last; 
	
	if(changechance.coin,{
		
		mult= [1.02, rrand(1.05,1.2),exprand(1.001,1.1), rrand(1.1,3.9)].choose;  

	}); 
	
	last = (last*mult)%1.0; 
	if(abs(last)<0.0000001) {last = options.choose}; 
	
	2*next-1.0
});

file.writeData(data);
file.close;
)






//multiply with carry sequence
//http://en.wikipedia.org/wiki/Multiply-with-carry
(
var file,data; 
var sr=44100; 
var maxr = 200; 
var r = maxr; 
var roptions = Array.rand(8,2,199); 
var xr = Array.rand(maxr,0.01,0.99); 
//var options = Array.rand(500,0.01,0.99); 
var arraypos = 0; 
var a = 1.02;  
var c = rrand(0.0,1.0); 
var changechance = 0.001; 
var changechance2 = 0.0001; 
var changechance3 = 0.00002; 

//defaults to 44100 sample rate
file = SoundFile.new.headerFormat_("WAV").sampleFormat_("int16").numChannels_(1).sampleRate_(sr);

file.openWrite("/Users/nickcollins/Desktop/writetest.wav");

data = Signal.fill(sr*30, {|i|  
	
	var prev = xr[arraypos]; 
	var next = a*prev+c; 
	
	c = floor(next); 
	
	next = next%1.0; 

	//if(abs(next)<0.0000001) {next = options.choose}; 
	
	xr[arraypos] = next; 
	
	arraypos = (arraypos + 1)%r; 
	
	if(changechance.coin,{
		
		a= [1.0001, rrand(1.0001,1.0005),exprand(1.0001,1.005), rrand(1.01,1.05), rrand(1.1,1.99)].wchoose([0.2,0.2,0.2,0.16,0.04]);  
		
	}); 
	
	if(changechance.coin) {
		
		r = [roptions.choose, exprand(2,199).asInteger].wchoose([0.95,0.05]); 
		
	}; 
	
	if(changechance2.coin) {
		
		roptions = Array.rand([exprand(1,100).asInteger,rrand(2,10)].choose,2,199); 
		
	}; 
	
	if(changechance3.coin) {
		
		xr = Array.rand(maxr,0.01,0.99); 
		
	}; 
	
	if(changechance3.coin) {
		
		c = rrand(0.0,1.0); 
		
	}; 
	
	
	if(changechance3.coin,{
		
		changechance = [0.001,exprand(0.0001,0.001)].choose; 
		changechance2 = [0.0001,exprand(0.0001,0.001)].choose;  
		changechance3 = [0.0002,exprand(0.0001,0.001)].choose;    
		
	}); 
	
	
	
	2*next-1.0
});

file.writeData(data);
file.close;
)






//multiply with carry sequence, with interpolation to slow down, and nonlinear powers
(
var file,data; 
var sr=44100; 
var maxr = 200; 
var r = maxr; 
var roptions = Array.rand(8,2,199); 
var powers = Array.fill(maxr,{[1.0,1.0-exprand(0.1,1.0),rrand(0.1,3.0)].choose}); 
var xr = Array.rand(maxr,0.01,0.99); 
//var options = Array.rand(500,0.01,0.99); 
var arraypos = 0; 
var a = 1.02;  
var c = rrand(0.0,1.0); 
var changechance = 0.001; 
var changechance2 = 0.0001; 
var changechance3 = 0.00002; 
var changechance4 = 0.0005; 
var interpsteps = 5; 
var interpmul = 1.0/interpsteps; 
var interp = 0; 
var interpa = 0.0, interpb= 0.0; 
var t; 

//defaults to 44100 sample rate
file = SoundFile.new.headerFormat_("WAV").sampleFormat_("int16").numChannels_(1).sampleRate_(sr);

file.openWrite("/Users/nickcollins/Desktop/writetest.wav");

data = Signal.fill(sr*30, {|i|  
	

	var prev = xr[arraypos]; 
	var next = a*(prev**(powers[arraypos]))+c; 

	if(interp==0) {
	
	c = floor(next); 
	
	next = next%1.0; 

	//if(abs(next)<0.0000001) {next = options.choose}; 
	
	xr[arraypos] = next; 
	
	arraypos = (arraypos + 1)%r; 
	
	if(changechance.coin,{
		
		a= [1.0001, rrand(1.0001,1.0005),exprand(1.0001,1.005), rrand(1.01,1.05), rrand(1.1,1.99)].wchoose([0.2,0.2,0.2,0.12,0.08]);  
		
	}); 
	
	if(changechance.coin) {
		
		r = [roptions.choose, exprand(2,199).asInteger].wchoose([0.95,0.05]); 
		
	}; 
	
	if(changechance2.coin) {
		
		roptions = Array.rand([exprand(1,100).asInteger,rrand(1,10)].choose,2,199); 
		
	}; 
	
	if(changechance3.coin) {
		
		xr = Array.rand(maxr,0.01,0.99); 
		
	}; 
	
	if(changechance3.coin) {
		
		c = rrand(0.0,1.0); 
		
	}; 
	
	
	if(changechance3.coin,{
		
		changechance = [0.001,exprand(0.0001,0.001)].choose; 
		changechance2 = [0.00005,exprand(0.0001,0.001)].choose;  
		changechance3 = [0.00002,exprand(0.0001,0.001)].choose;    
		
	}); 
	
	
	if(changechance4.coin) {

		interpsteps = rrand(1,30); 
		interpmul = 1.0/interpsteps; 
		
		changechance4 = interpsteps*0.001; 
		
	}; 
	
	
	interpa = interpb; 
	interpb = 2*next-1.0; 
	};
	
	
	
	
	t = interp * interpmul; 
	
	next = ((1.0-t)*interpa) + (t*interpb); 
	
	interp = (interp+1)%interpsteps; 
	
	next;
});

file.writeData(data);
file.close;
)
raw 4786 chars (focus & ctrl+a+c to copy)
reception
comments
vividsnow user 08 Sep'11 07:12

alien radio )