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Copy pathLarge repository of Supercollider licks backup.scd
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Large repository of Supercollider licks backup.scd
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SIGNAL PROCESSING in SuperCollider
1. A Tour of available Unit Generators.
SuperCollider has over 250 unit generators.
If you count the unary and binary operators, there are over 300.
This tour covers many, but not all of them.
categories of unit generators:
sources: periodic, aperiodic
filters
distortion
panning
delays and buffer ugens
control: envelopes, triggers, counters, gates, lags, decays
spectral
2. Techniques
broadening a sound:
decorrelation, beat frequencies, delays.
series and parallel structures.
(
s = Server.internal;
Server.default = s;
s.boot;
)
Periodic Sources: Oscillators.
LF - "Low Frequency" Unit Generators.
LFPar, LFCub, LFTri, Impulse, LFSaw, LFPulse, VarSaw, SyncSaw
geometric waveforms, not band limited.
will cause aliasing at higher frequencies.
LFPar, LFCub, LFTri, LFSaw, Impulse
arguments: frequency, phase, mul, add
// parabolic approximation of sine
{ LFPar.ar(LFPar.kr(LFPar.kr(0.2,0,8,10),0, 400,800),0,0.1) }.scope(1, zoom: 4);
{ LFPar.ar(LFPar.kr(0.2, 0, 400,800),0,0.1) }.scope(1, zoom: 4);
{ LFPar.ar(800,0,0.1) }.scope(1, zoom: 4);
// since it is not band limited, there are aliasing artifacts
{ LFPar.ar(XLine.kr(100,15000,6),0,0.1) }.scope(1, zoom: 4);
// cubic approximation of sine
{ LFCub.ar(LFCub.kr(LFCub.kr(0.2,0,8,10),0, 400,800),0,0.1) }.scope(1, zoom: 4);
{ LFCub.ar(LFCub.kr(0.2, 0, 400,800),0,0.1) }.scope(1, zoom: 4);
{ LFCub.ar(800,0,0.1) }.scope(1, zoom: 4);
{ LFCub.ar(XLine.kr(100,15000,6),0,0.1) }.scope(1, zoom: 4);
{ LFTri.ar(LFTri.kr(LFTri.kr(0.2,0,8,10),0, 400,800),0,0.1) }.scope(1, zoom: 4);
{ LFTri.ar(LFTri.kr(0.2, 0, 400,800),0,0.1) }.scope(1, zoom: 4);
{ LFTri.ar(800,0,0.1) }.scope(1, zoom: 4);
{ LFTri.ar(XLine.kr(100,15000,6),0,0.1) }.scope(1, zoom: 4);
{ LFSaw.ar(LFSaw.kr(LFSaw.kr(0.2,0,8,10),0, 400,800),0,0.1) }.scope(1, zoom: 4);
{ LFSaw.ar(LFSaw.kr(0.2, 0, 400,800),0,0.1) }.scope(1, zoom: 4);
{ LFSaw.ar(100,0,0.1) }.scope(1, zoom: 4);
{ LFSaw.ar(XLine.kr(100,15000,6),0,0.1) }.scope(1, zoom: 4);
{ Impulse.ar(LFTri.kr(LFTri.kr(0.2,0,8,10),0, 400,800),0,0.1) }.scope(1, zoom: 4);
{ Impulse.ar(LFTri.kr(0.2, 0, 400,800),0,0.1) }.scope(1, zoom: 4);
{ Impulse.ar(100,0,0.1) }.scope(1, zoom: 4);
{ Impulse.ar(XLine.kr(100,15000,6),0,0.1) }.scope(1, zoom: 4);
LFPulse, VarSaw
arguments: frequency, phase, width, mul, add
{ LFPulse.ar(LFPulse.kr(LFPulse.kr(0.2,0,0.5,8,10),0,0.5, 400,800),0,0.5,0.1) }.scope(1, zoom: 4);
{ LFPulse.ar(LFPulse.kr(3, 0, 0.3, 200, 200), 0, 0.2, 0.1) }.scope(1, zoom: 4);
{ LFPulse.ar(XLine.kr(100,15000,6),0,0.5,0.1) }.scope(1, zoom: 4);
// pulse width modulation
{ LFPulse.ar(100,0,MouseY.kr(0,1),0.1) }.scope(1, zoom: 4);
{ LFPulse.ar(100,0,LFTri.kr(0.2,0,0.5,0.5),0.1) }.scope(1, zoom: 4);
{ VarSaw.ar(VarSaw.kr(VarSaw.kr(0.2,0,0.2,8,10),0,0.2, 400,800),0,0.2,0.1) }.scope(1, zoom: 4);
{ VarSaw.ar(VarSaw.kr(0.2, 0, 0.2, 400,800),0,0.2,0.1) }.scope(1, zoom: 4);
{ VarSaw.ar(XLine.kr(100,15000,6),0,0.2,0.1) }.scope(1, zoom: 4);
// pulse width modulation
{ VarSaw.ar(100,0,MouseY.kr(0,1),0.1) }.scope(1, zoom: 4);
{ VarSaw.ar(100,0,LFTri.kr(0.2,0,0.5,0.5),0.1) }.scope(1, zoom: 4);
SyncSaw
arguments: syncFreq, sawFreq, mul, add
{ SyncSaw.ar(100, MouseX.kr(100, 1000), 0.1) }.scope(1, zoom: 4);
{ SyncSaw.ar(100, Line.kr(100, 800, 12), 0.1) }.scope(1, zoom: 4);
Band Limited Oscillators
SinOsc, FSinOsc, Blip, Saw, Pulse
will not alias.
SinOsc, FSinOsc
arguments: frequency, phase, mul, add
{ SinOsc.ar(SinOsc.kr(SinOsc.kr(0.2,0,8,10),0, 400,800),0,0.1) }.scope(1, zoom: 4);
{ SinOsc.ar(SinOsc.kr(0.2, 0, 400,800),0,0.1) }.scope(1, zoom: 4);
{ SinOsc.ar(800,0,0.1) }.scope(1, zoom: 4);
{ SinOsc.ar(XLine.kr(100,15000,6),0,0.1) }.scope(1, zoom: 4);
{ FSinOsc.ar(800,0,0.1) }.scope(1, zoom: 4);
// FSinOsc should not be frequency modulated.
// Since it is based on a filter at the edge of stability, it will blow up:
{ FSinOsc.ar(FSinOsc.kr(FSinOsc.kr(0.2,0,8,10),0, 400,800),0,0.1) }.scope(1, zoom: 4);
Blip
arguments: frequency, numHarmonics, mul, add
{ Blip.ar(XLine.kr(20000,200,6),100,0.2) }.scope(1);
{ Blip.ar(XLine.kr(100,15000,6),100,0.2) }.scope(1); // no aliasing
// modulate number of harmonics
{ Blip.ar(200,Line.kr(1,100,20),0.2) }.scope(1);
Saw
arguments: frequency, mul, add
{ Saw.ar(XLine.kr(20000,200,6),0.2) }.scope(1);
{ Saw.ar(XLine.kr(100,15000,6),0.2) }.scope(1); // no aliasing
Pulse
arguments: frequency, width, mul, add
{ Pulse.ar(XLine.kr(20000,200,6),0.3,0.2) }.scope(1);
{ Pulse.ar(XLine.kr(100,15000,6),0.3,0.2) }.scope(1); // no aliasing
// modulate pulse width
{ Pulse.ar(200, Line.kr(0.01,0.99,8), 0.2) }.scope(1);
// two band limited square waves thru a resonant low pass filter
{ RLPF.ar(Pulse.ar([100,250],0.5,0.1), XLine.kr(8000,400,5), 0.05) }.scope(1);
Klang - sine oscillator bank
arguments: `[ frequencies, amplitudes, phases ], mul, add
{ Klang.ar(`[ [800, 1000, 1200],[0.3, 0.3, 0.3],[pi,pi,pi]], 1, 0) * 0.4}.scope(1);
{ Klang.ar(`[ {exprand(400, 2000)}.dup(16), nil, nil ], 1, 0) * 0.04 }.scope(1);
Table Oscillators
Osc, COsc, VOsc, VOsc3
Use a buffer allocated on the server.
Osc
arguments: buffer number, frequency, phase, mul, add.
(
b = Buffer.alloc(s, 2048, 1, bufnum: 80);
b.sine1(1.0/(1..6), true, true, true);
)
{ Osc.ar(80, 100, 0, 0.1) }.scope(1, zoom:4);
b.sine1(1.0/(1..12));
b.sine1(1.0/(1..24));
b.sine1(1.0/(1..32));
b.sine1([1.0/(1,3..12), 0].flop.flat.postln);
b.sine1([1.0/(1,3..32).squared, 0].flop.flat.postln);
b.sine1((1.dup(4) ++ 0.dup(8)).scramble.postln);
b.sine1((1.dup(4) ++ 0.dup(8)).scramble.postln);
b.sine1((1.dup(4) ++ 0.dup(8)).scramble.postln);
b.sine1((1.dup(4) ++ 0.dup(8)).scramble.postln);
b.sine1({1.0.rand2.cubed}.dup(8).round(1e-3).postln);
b.sine1({1.0.rand2.cubed}.dup(12).round(1e-3).postln);
b.sine1({1.0.rand2.cubed}.dup(16).round(1e-3).postln);
b.sine1({1.0.rand2.cubed}.dup(24).round(1e-3).postln);
COsc - two oscillators, detuned
arguments: buffer number, frequency, beat frequency, mul, add.
b.sine1(1.0/(1..6), true, true, true);
{ COsc.ar(80, 100, 1, 0.1) }.scope(1, zoom:4);
// change buffer as above.
VOsc - multiple wave table crossfade oscillators
arguments: buffer number, frequency, phase, mul, add.
(
// allocate tables 80 to 87
8.do {|i| s.sendMsg(\b_alloc, 80+i, 1024); };
)
(
// fill tables 80 to 87
8.do({|i|
var n, a;
// generate array of harmonic amplitudes
n = (i+1)**2; // num harmonics for each table: [1,4,9,16,25,36,49,64]
a = {|j| ((n-j)/n).squared }.dup(n);
// fill table
s.listSendMsg([\b_gen, 80+i, \sine1, 7] ++ a);
});
)
{ VOsc.ar(MouseX.kr(80,87), 120, 0, 0.3) }.scope(1, zoom:4);
(
// allocate and fill tables 80 to 87
8.do({|i|
// generate array of harmonic amplitudes
a = {1.0.rand2.cubed }.dup((i+1)*4);
// fill table
s.listSendMsg([\b_gen, 80+i, \sine1, 7] ++ a);
});
)
VOsc3 - three VOscs summed.
arguments: buffer number, freq1, freq2, freq3, beat frequency, mul, add.
// chorusing
{ VOsc3.ar(MouseX.kr(80,87), 120, 121.04, 119.37, 0.2) }.scope(1, zoom:4);
// chords
{ VOsc3.ar(MouseX.kr(80,87), 120, 151.13, 179.42, 0.2) }.scope(1, zoom:4);
Aperiodic Sources: Noise.
LF "Low Frequency" Noise Generators.
LFNoise0, LFNoise1, LFNoise2, LFClipNoise
arguments: frequency, mul, add
{ LFClipNoise.ar(MouseX.kr(200, 10000, 1), 0.125) }.scope(1);
{ LFNoise0.ar(MouseX.kr(200, 10000, 1), 0.25) }.scope(1);
{ LFNoise1.ar(MouseX.kr(200, 10000, 1), 0.25) }.scope(1);
{ LFNoise2.ar(MouseX.kr(200, 10000, 1), 0.25) }.scope(1);
// used as controls
{ LFPar.ar(LFClipNoise.kr(MouseX.kr(0.5, 64, 1), 200, 400), 0, 0.2) }.scope(1, zoom:8);
{ LFPar.ar(LFNoise0.kr(MouseX.kr(0.5, 64, 1), 200, 400), 0, 0.2) }.scope(1, zoom:8);
{ LFPar.ar(LFNoise1.kr(MouseX.kr(0.5, 64, 1), 200, 400), 0, 0.2) }.scope(1, zoom:8);
{ LFPar.ar(LFNoise2.kr(MouseX.kr(0.5, 64, 1), 200, 400), 0, 0.2) }.scope(1, zoom:8);
Broad Spectrum Noise Generators
ClipNoise, WhiteNoise, PinkNoise, BrownNoise, GrayNoise
arguments: mul, add
{ ClipNoise.ar(0.2) }.scope(1);
{ WhiteNoise.ar(0.2) }.scope(1);
{ PinkNoise.ar(0.4) }.scope(1);
{ BrownNoise.ar(0.2) }.scope(1);
{ GrayNoise.ar(0.2) }.scope(1);
Impulse Noise Generators
Dust, Dust2
arguments: density, mul, add
{ Dust.ar(MouseX.kr(1,10000,1), 0.4) }.scope(1, zoom:4);
{ Dust2.ar(MouseX.kr(1,10000,1), 0.4) }.scope(1, zoom:4);
Chaotic Noise Generators
Crackle
arguments: chaosParam, mul, add
{ Crackle.ar(MouseX.kr(1,2), 0.5) }.scope(1);
Filters
Low Pass, High Pass
LPF, HPF - 12 dB / octave
arguments: in, freq, mul, add
{ LPF.ar(WhiteNoise.ar, MouseX.kr(1e2,2e4,1), 0.2) }.scope(1);
{ HPF.ar(WhiteNoise.ar, MouseX.kr(1e2,2e4,1), 0.2) }.scope(1);
{ LPF.ar(Saw.ar(100), MouseX.kr(1e2,2e4,1), 0.2) }.scope(1);
{ HPF.ar(Saw.ar(100), MouseX.kr(1e2,2e4,1), 0.2) }.scope(1);
Band Pass, Band Cut
BPF, BRF - 12 dB / octave
arguments: in, freq, rq, mul, add
rq is the reciprocal of the Q of the filter,
or in other words: the bandwidth in Hertz = rq * freq.
{ BPF.ar(WhiteNoise.ar, MouseX.kr(1e2,2e4,1), 0.4, 0.4) }.scope(1);
{ BRF.ar(WhiteNoise.ar, MouseX.kr(1e2,2e4,1), 0.4, 0.2) }.scope(1);
{ BPF.ar(Saw.ar(100), MouseX.kr(1e2,2e4,1), 0.4, 0.4) }.scope(1);
{ BRF.ar(Saw.ar(100), MouseX.kr(1e2,2e4,1), 0.4, 0.2) }.scope(1);
// modulating the bandwidth
{ BPF.ar(WhiteNoise.ar, 3000, MouseX.kr(0.01,0.7,1), 0.4) }.scope(1);
Resonant Low Pass, High Pass, Band Pass
RLPF, RHPF - 12 dB / octave
arguments: in, freq, rq, mul, add
{ RLPF.ar(WhiteNoise.ar, MouseX.kr(1e2,2e4,1), 0.2, 0.2) }.scope(1);
{ RHPF.ar(WhiteNoise.ar, MouseX.kr(1e2,2e4,1), 0.2, 0.2) }.scope(1);
{ RLPF.ar(Saw.ar(100), MouseX.kr(1e2,2e4,1), 0.2, 0.2) }.scope(1);
{ RHPF.ar(Saw.ar(100), MouseX.kr(1e2,2e4,1), 0.2, 0.2) }.scope(1);
Resonz - resonant band pass filter with uniform amplitude
arguments: in, freq, rq, mul, add
// modulate frequency
{ Resonz.ar(WhiteNoise.ar(0.5), XLine.kr(1000,8000,10), 0.05) }.scope(1);
// modulate bandwidth
{ Resonz.ar(WhiteNoise.ar(0.5), 2000, XLine.kr(1, 0.001, 8)) }.scope(1);
// modulate bandwidth opposite direction
{ Resonz.ar(WhiteNoise.ar(0.5), 2000, XLine.kr(0.001, 1, 8)) }.scope(1);
Ringz - ringing filter.
Internally it is the same as Resonz but the bandwidth is expressed as a ring time.
arguments: in, frequency, ring time, mul, add
{ Ringz.ar(Dust.ar(3, 0.3), 2000, 2) }.scope(1, zoom:4);
{ Ringz.ar(WhiteNoise.ar(0.005), 2000, 0.5) }.scope(1);
// modulate frequency
{ Ringz.ar(WhiteNoise.ar(0.005), XLine.kr(100,3000,10), 0.5) }.scope(1, zoom:4);
{ Ringz.ar(Impulse.ar(6, 0, 0.3), XLine.kr(100,3000,10), 0.5) }.scope(1, zoom:4);
// modulate ring time
{ Ringz.ar(Impulse.ar(6, 0, 0.3), 2000, XLine.kr(0.04, 4, 8)) }.scope(1, zoom:4);
Simpler Filters
6 dB / octave
{ OnePole.ar(WhiteNoise.ar(0.5), MouseX.kr(-0.99, 0.99)) }.scope(1);
{ OneZero.ar(WhiteNoise.ar(0.5), MouseX.kr(-0.49, 0.49)) }.scope(1);
NonLinear Filters
Median, Slew
// a signal with impulse noise.
{ Saw.ar(500, 0.1) + Dust2.ar(100, 0.9) }.scope(1);
// after applying median filter
{ Median.ar(3, Saw.ar(500, 0.1) + Dust2.ar(100, 0.9)) }.scope(1);
// a signal with impulse noise.
{ Saw.ar(500, 0.1) + Dust2.ar(100, 0.9) }.scope(1);
// after applying slew rate limiter
{ Slew.ar(Saw.ar(500, 0.1) + Dust2.ar(100, 0.9),1000,1000) }.scope(1);
Formant Filter
Formlet - A filter whose impulse response is similar to a FOF grain.
{ Formlet.ar(Impulse.ar(MouseX.kr(2,300,1), 0, 0.4), 800, 0.01, 0.1) }.scope(1, zoom:4);
Klank - resonant filter bank
arguments: `[ frequencies, amplitudes, ring times ], mul, add
{ Klank.ar(`[[200, 671, 1153, 1723], nil, [1, 1, 1, 1]], Impulse.ar(2, 0, 0.1)) }.play;
{ Klank.ar(`[[200, 671, 1153, 1723], nil, [1, 1, 1, 1]], Dust.ar(8, 0.1)) }.play;
{ Klank.ar(`[[200, 671, 1153, 1723], nil, [1, 1, 1, 1]], PinkNoise.ar(0.007)) }.play;
{ Klank.ar(`[ {exprand(200, 4000)}.dup(12), nil, nil ], PinkNoise.ar(0.007)) }.scope(1);
{ Klank.ar(`[ (1..13)*200, 1/(1..13), nil ], PinkNoise.ar(0.01)) }.scope(1);
{ Klank.ar(`[ (1,3..13)*200, 1/(1,3..13), nil ], PinkNoise.ar(0.01)) }.scope(1);
Distortion
abs, max, squared, cubed
{ SinOsc.ar(300, 0, 0.2) }.scope(1);
{ SinOsc.ar(300, 0, 0.2).abs }.scope(1);
{ SinOsc.ar(300, 0, 0.2).max(0) }.scope(1);
{ SinOsc.ar(300, 0).squared * 0.2 }.scope(1);
{ SinOsc.ar(300, 0).cubed * 0.2 }.scope(1);
distort, softclip, clip2, fold2, wrap2,
{ SinOsc.ar(300, 0, MouseX.kr(0.1,80,1)).distort * 0.2 }.scope(1);
{ SinOsc.ar(300, 0, MouseX.kr(0.1,80,1)).softclip * 0.2 }.scope(1);
{ SinOsc.ar(300, 0, MouseX.kr(0.1,80,1)).clip2(1) * 0.2 }.scope(1);
{ SinOsc.ar(300, 0, MouseX.kr(0.1,80,1)).fold2(1) * 0.2 }.scope(1);
{ SinOsc.ar(300, 0, MouseX.kr(0.1,80,1)).wrap2(1) * 0.2 }.scope(1);
{ SinOsc.ar(300, 0, MouseX.kr(0.1,80,1)).wrap2(1) * 0.2 }.scope(1);
scaleneg
{ SinOsc.ar(200, 0, 0.2).scaleneg(MouseX.kr(-1,1)) }.scope(1);
waveshaping by phase modulating a 0 Hz sine oscillator
(currently there is a limit of 8pi)
(
{
var in;
in = SinOsc.ar(300, 0, MouseX.kr(0.1,8pi,1));
SinOsc.ar(0, in, 0.2); // 0 Hz sine oscillator
}.scope(1);
)
Shaper
input is used to look up a value in a table.
Chebyshev polynomials are typically used to fill the table.
s.sendMsg(\b_alloc, 80, 1024); // allocate table
// fill with chebyshevs
s.listSendMsg([\b_gen, 80, \cheby, 7] ++ {1.0.rand2.squared}.dup(6));
{ Shaper.ar(80, SinOsc.ar(600, 0, MouseX.kr(0,1))) * 0.3; }.scope(1);
s.listSendMsg([\b_gen, 80, \cheby, 7] ++ {1.0.rand2.squared}.dup(6));
s.listSendMsg([\b_gen, 80, \cheby, 7] ++ {1.0.rand2.squared}.dup(6));
Panning
(
s = Server.internal;
Server.default = s;
s.quit;
s.options.numOutputBusChannels = 8;
s.options.numInputBusChannels = 8;
s.boot;
)
Pan2 - equal power stereo pan a mono source
arguments: in, pan position, level
pan controls typically range from -1 to +1
{ Pan2.ar(BrownNoise.ar, MouseX.kr(-1,1), 0.3) }.scope(2);
{ Pan2.ar(BrownNoise.ar, SinOsc.kr(0.2), 0.3) }.scope(2);
LinPan2 - linear pan a mono source (not equal power)
arguments: in, pan position, level
{ LinPan2.ar(BrownNoise.ar, MouseX.kr(-1,1), 0.3) }.scope(2);
{ LinPan2.ar(BrownNoise.ar, SinOsc.kr(0.2), 0.3) }.scope(2);
Balance2 - balance a stereo source
arguments: left in, right in, pan position, level
{ Balance2.ar(BrownNoise.ar, BrownNoise.ar, MouseX.kr(-1,1), 0.3) }.scope(2);
Pan4 - equal power quad panner
{ Pan4.ar(BrownNoise.ar, MouseX.kr(-1,1), MouseY.kr(1,-1), 0.3) }.scope(4);
PanAz - azimuth panner to any number of channels
arguments: num channels, in, pan position, level, width
{ PanAz.ar(5, BrownNoise.ar, MouseX.kr(-1,1), 0.3, 2) }.scope(5);
// change width to 3
{ PanAz.ar(5, BrownNoise.ar, MouseX.kr(-1,1), 0.3, 3) }.scope(5);
XFade2 - equal power cross fade between two inputs
arguments: in1, in2, crossfade, level
{ XFade2.ar(BrownNoise.ar, SinOsc.ar(500), MouseX.kr(-1,1), 0.3) }.scope(1);
PanB2 and DecodeB2 - 2D ambisonics panner and decoder
(
{
var w, x, y, p, lf, rf, rr, lr;
p = BrownNoise.ar; // source
// B-format encode
#w, x, y = PanB2.ar(p, MouseX.kr(-1,1), 0.3);
// B-format decode to quad. outputs in clockwise order
#lf, rf, rr, lr = DecodeB2.ar(4, w, x, y);
[lf, rf, lr, rr] // reorder to my speaker arrangement: Lf Rf Lr Rr
}.scope(4);
)
Rotate2 - rotate a sound field of ambisonic or even stereo sound.