supercollider

separate noisy and pitched sounds

clean-up: #38

here’s a little fun trick how to use the not so well known clarity mode of supercollider’s built in Pitch tracker. set the clar argument to 1 and then grab the second value returned. by default this is a binary hasFreq flag, but with clar=1 it becomes a continuous value 0.0 to 1.0.
the example below includes a one second delay to be able to hear the sounds you make being panned left-right depending on how ’clear’ they are. there’s also a short lag and a curved mapping to make the example work better.

//example: noise in left ear, clear tones in right
//use headphones
{
        var src= DelayN.ar(SoundIn.ar, 1, 1);
        var clarity= Pitch.kr(src, clar:1)[1].lag(0.1);
        Pan2.ar(src, clarity.lincurve(0.1, 0.9, -1, 1, 4).poll);
}.play

and as variations on the above one could easily mute noises…

//example: mute noise, only play pitched sounds
//use headphones
{
        var src= DelayN.ar(SoundIn.ar, 1, 1);
        var clarity= Pitch.kr(src, clar:1)[1].lag(0.1);
        Pan2.ar(src)*clarity.lincurve(0.1, 0.9, 0, 1, 4);
}.play

and of course by just flipping a value around we only play the noises…

//example: mute pitched sounds, only play noises
//use headphones
{
        var src= DelayN.ar(SoundIn.ar, 1, 1);
        var clarity= Pitch.kr(src, clar:1)[1].lag(0.1);
        Pan2.ar(src)*(1-clarity.lincurve(0.1, 0.9, 0, 1, 4));
}.play

last an example to demonstrate how to route signals to effects depending on clarity…

//example: pitched sounds with reverb
//use headphones
{
        var src= DelayN.ar(SoundIn.ar, 1, 1)*0.5;
        var clarity= Pitch.kr(src, clar:1)[1].lag(2);
        XFade2.ar(src, GVerb.ar(src, 50), clarity.lincurve(0.3, 0.9, -1, 1, -2).poll);
}.play

quartz composer in sc

clean-up: #37

thanks to scott wilson it is possible to load and embed quartz composer sketches in supercollider.
below is an example that demonstrate how to use it with a camera input. you'll need the attached .qtz file and edit the path in the sc code.

cam qtz from redFrik on Vimeo.

note1: this is mac osx only.
note2: this works on sc3.7 (or sc3.5 if you replace QuartzComposerView with SCQuartzComposerView).
note3: i didn't test but you could maybe make it run under sc3.6 with GUI.cocoa.

(
var width= 1024, height= 576;
w= Window("qc", Rect(100, 100, width, height)).front;
m= QuartzComposerView(w, Rect(0, 0, width, height));
//m.path= "~/Desktop/cam.qtz".standardizePath;  //edit to match filepath
m.path= thisProcess.nowExecutingPath.dirname+/+"cam.qtz";
CmdPeriod.doOnce({w.close});
m.start;
m.inputKeys.postln;     //should return [X, Y]
s.waitForBoot{
        ~speedx= 0.1;
        ~speedy= 0.11;
        a= {|x= 0, y= 0| Pan2.ar(MoogFF.ar(Saw.ar(1-y.lag(0.1)*99+99), y.lag(0.1)*199+99, 3), x.lag(0.1)*2-1)}.play;
        r= Routine({
                inf.do{|i|
                                var x= sin(i*~speedx)*0.5+0.5;
                                var y= cos(i*~speedy)*0.5+0.5;
                                m.setInputValue(\X, x);
                                m.setInputValue(\Y, y);
                                a.set(\x, x, \y, y);
                                (1/60).wait;
                };
        }).play(AppClock);
};
)

~speedx= 0.02
~speedx= 0.4
~speedy= 0.05
~speedy= 0.5

r.stop;
a.free;
m.stop;
w.close;

in the above example frequency is mapped to video effect vertical movement, and panning to video effect horizontal movement.

AttachmentSize
Binary Data cam.qtz35.9 KB

extMultiSliderView

clean-up: #36

in november 2011 there was some discussion on the sc-users mailinglist about a multislider point scroll similar to the one in maxmsp. there were many nice suggestions in the thread, but as so often nothing got decided/implemented. below is my suggestion - a simple fifo.

extMultiSliderView from redFrik on Vimeo.

here is the class extension...

//for sc3.6 or earlier
//copy and save as extSCMultiSliderView.sc in extensions folder
+SCMultiSliderView {
        add {|val|
                this.value= this.value.copyRange(1, this.value.size-1)++val;
        }
        addFirst {|val|
                this.value= val.asArray++this.value.copyRange(0, this.value.size-2);
        }
}
+QMultiSliderView {
        add {|val|
                this.value= this.value.copyRange(1, this.value.size-1)++val;
        }
        addFirst {|val|
                this.value= val.asArray++this.value.copyRange(0, this.value.size-2);
        }
}

note that if you're using the latest sc3.7, then the GUI redirect classes are gone and you need to write the class extensions like the following...

//for sc3.7 or newer
//copy and save as extMultiSliderView.sc in extensions folder
+MultiSliderView {
        add {|val|
                this.value= this.value.copyRange(1, this.value.size-1)++val;
        }
        addFirst {|val|
                this.value= val.asArray++this.value.copyRange(0, this.value.size-2);
        }
}

and here are the examples from the video...

//--basic example
(
var n= 100; //number of sliders
var w= Window("scroll test").front;
var a= MultiSliderView(w, Rect(10, 10, w.bounds.width-20, w.bounds.height-20));
a.elasticMode= 1;
a.value= Array.fill(n, {0});
Routine({
        inf.do{|i|
                0.05.wait; //scroll speed
                a.addFirst(sin(i/10)*0.5+0.5); //try .add instead of .addFirst
        };
}).play(AppClock);
CmdPeriod.doOnce({w.close});
)

//--example with sound input
(
s.waitForBoot{
        var n= 100; //number of sliders
        var w= Window("scroll test audio").front;
        var a= MultiSliderView(w, Rect(0, 0, w.bounds.width, w.bounds.height));
        var b= {
                var src= SoundIn.ar; //mic input
                SendReply.kr(Impulse.kr(60), '/trk', Amplitude.kr(src, 0.1, 0.1));
                DC.ar(0); //silence
        }.play;
        a.elasticMode= 1;
        a.valueThumbSize= 8;
        a.indexThumbSize= 1;
        a.drawLines= true;
        a.value= Array.fill(n, {0});
        OSCFunc({|msg| {a.addFirst(msg[3])}.defer}, '/trk');
        CmdPeriod.doOnce({w.close});
};
)

also see Marije's SWPloterMonitor from her same day clean-up.

Linear feedback shift register

clean-up: #35

over a year ago i was playing with lfsr to generate pseudo-random noise. below i cleaned up and published the results.

lfsr from redFrik on Vimeo.

with inspiration from Sebastian Tomczak's lfsr-in-maxmsp and this video.

//4-bit Fibonacci LFSR
//https://en.wikipedia.org/wiki/Linear_feedback_shift_register
(
b= 2r1000; //seed
a= [];
15.do{
        a= a++b.asBinaryDigits(4);
        b= (b>>1)|((b&1).bitXor(b&2>>1)<<3);
        b.postln;
};
"";
)

s.boot
c= Buffer.loadCollection(s, a)
c.plot
{PlayBuf.ar(1, c, MouseX.kr(0, 1), loop:1)!2}.play

//4-bit Fibonacci LFSR with local in/out
(
a= {|rate= 4, iseed= 2r1000|
        var b, trig;
        var in= LocalIn.kr(1, iseed);
        trig= Impulse.kr(rate);
        b= Latch.kr(in, trig);//read
        b= (b>>1)|((b&1).bitXor(b&2>>1)<<3);//modify
        LocalOut.kr(b);
        b.poll(trig);
        DC.ar(0);
}.play;
)
a.set(\rate, 30)
a.free

//4-bit Fibonacci LFSR as single sample feedback with dbufrd/dbufwr
(
a= {|rate= 4, iseed= 2r1000|
        var b, trig;
        var buf= LocalBuf(1);
        buf.set(iseed);
        trig= Impulse.ar(rate);
        b= Demand.ar(trig, 0, Dbufrd(buf));//read
        b= (b>>1)|((b&1).bitXor(b&2>>1)<<3);//modify
        Demand.ar(trig, 0, Dbufwr(b, buf));//write
        b.poll(trig);
        DC.ar(0);
}.play;
)
a.set(\rate, 30)
a.free

//lfsr sound example (not sure this is correct but sounds ok)
(
a= {|rate= 400, iseed= 2r1000, tap1= 1, tap2= 3, tap3= 5, length= 16|
        var l, b, trig, o;
        var buf= LocalBuf(1);
        buf.set(iseed);
        trig= Impulse.ar(rate);
        l= Demand.ar(trig, 0, Dbufrd(buf));//read
        b= l.bitXor(l>>tap1).bitXor(l>>tap2).bitXor(l>>tap3)&1;//modify
        l= (l>>1)|(b<<15);//lfsr
        Demand.ar(trig, 0, Dbufwr(l, buf));//write
        o= PulseCount.ar(Impulse.ar(rate*length), trig);//bits
        l>>o&1!2;//output
}.play;
)

a.set(\rate, 300)
a.set(\rate, 100)
a.set(\length, 3)
a.set(\length, 14)
a.set(\tap1, 14.rand)
a.set(\tap2, 14.rand)
a.set(\tap3, 14.rand)
a.set(\length, 32)
a.set(\rate, 1000)
a.free

//lfsr sound with gui  (not sure this is correct but sounds ok)
(
var w, a;
w= Window("lfsr", Rect(100, 100, 520, 200)).front;
Slider(w, Rect(10, 10, 500, 25)).action_({|view| a.set(\rate, view.value*2000)}).value= 400/2000;
Slider(w, Rect(10, 40, 500, 25)).action_({|view| a.set(\length, view.value*32)}).value= 16/32;
a= {|rate= 400, iseed= 2r1000, tap1= 1, tap2= 3, tap3= 5, length= 16|
        var l, b, trig, o;
        var buf= LocalBuf(1);
        buf.set(iseed);
        trig= Impulse.ar(rate);
        l= Demand.ar(trig, 0, Dbufrd(buf));//read
        b= l.bitXor(l>>tap1).bitXor(l>>tap2).bitXor(l>>tap3)&1;//modify
        l= (l>>1)|(b<<15);//lfsr
        Demand.ar(trig, 0, Dbufwr(l, buf));//write
        o= PulseCount.ar(Impulse.ar(rate*length), trig);//bits
        l>>o&1!2;//output
}.play;
CmdPeriod.doOnce({w.close});
)

supercolliderArduino_sendAndReceive

clean-up: #33

below is some supercollider code for sending and receiving data from an arduino. it is a good example i think and worth sharing. it can be used as a template for when you want to read and write at the same time.

as the example is written supercollider writes data to six pwm channels (0-255), and reads data from six analog inputs (also 0-255). the sliders are the pwm output controllers, and the sensor input data is just posted as an array.

//supercolliderArduino_sendAndReceive /f0
//  controlling 6 pwm channels and reading 6 analog inputs at the same time
//  use with sc code supercolliderArduino_sendAndReceive.scd

//--serial protocol
// pwm sc->arduino: 10 nn nn nn nn nn nn 11 (nn bytes 1-6= pwm channels 0-5)
// adc arduino->sc: 20 nn nn nn nn nn nn 21 (nn bytes 1-6= analog channels 0-5)

//--settings
byte pwmPins[]= {5, 3, 9, 6, 11, 10};
byte adcPins[]= {0, 1, 2, 3, 4, 5};  //A0-A5

//--variables
boolean changed;
byte val, cnt= 0;
byte pwmData[]= {0, 0, 0, 0, 0, 0, 0, 0};
byte adcData[]= {0, 0, 0, 0, 0, 0, 0, 0};  //for detecting change and filter out repetitions

void setup() {
  Serial.begin(38400);    //baudrate must match in sc
  for(byte i= 0; i<6; i++) {
    pinMode(pwmPins[i], OUTPUT);
    pinMode(adcPins[i], INPUT);
  }
}
void loop() {
 
  //--from sc
  while(Serial.available()) {
    val= Serial.read();
    if(cnt==0) {
      if(val==10) {  //beginning of message found
        cnt= 1;  //start counter
      }
    } else if(cnt<7) {  //between 1 and 6 means message started and that bytes should be saved
      pwmData[cnt-1]= val;  //saving incoming bytes in temporary data array
      cnt++;
    } else {
      if(val==11) {
        for(byte i= 0; i<6; i++) {
          analogWrite(pwmPins[i], pwmData[i]);  //output read message to pwm pins
        }
      } else {
        //serial read error
      }
      cnt= 0;  //reset byte counter
    }
  }
 
  //--to sc
  changed= false;
  for(byte i= 0; i<6; i++) {
    val= analogRead(adcPins[i])>>4;  //scale from 10 to 8 bits
    if(val!=adcData[i]) {
      adcData[i]= val;
      changed= true;
    }
  }
  if(changed) {  //check if any sensor changed
    Serial.write(20);
    Serial.write(adcData[0]);
    Serial.write(adcData[1]);
    Serial.write(adcData[2]);
    Serial.write(adcData[3]);
    Serial.write(adcData[4]);
    Serial.write(adcData[5]);
    Serial.write(21);
  }
  delay(10);  //wait 10 milliseconds
}

//--use with supercolliderArduino_sendAndReceive.ino
//supercollider code for reading 6 analog sensors and sending out to 6 pwm channels

SerialPort.listDevices; //run this and see post window for name of serial device

//--gui code for sending 6 pwm
(
var name= "/dev/tty.usbserial-A101NB76";        //edit to match your serial device
var port= SerialPort(name, 38400, crtscts: true);
var pwm= [10, 0, 0, 0, 0, 0, 0, 11];
var win= Window("pwm", Rect(99, 99, 260, 200), false);
Slider(win, Rect(10, 10, 30, 170)).action_{|view| pwm.put(1, (view.value*255).asInteger); port.putAll(pwm.postln)};
Slider(win, Rect(50, 10, 30, 170)).action_{|view| pwm.put(2, (view.value*255).asInteger); port.putAll(pwm.postln)};
Slider(win, Rect(90, 10, 30, 170)).action_{|view| pwm.put(3, (view.value*255).asInteger); port.putAll(pwm.postln)};
Slider(win, Rect(130, 10, 30, 170)).action_{|view| pwm.put(4, (view.value*255).asInteger); port.putAll(pwm.postln)};
Slider(win, Rect(170, 10, 30, 170)).action_{|view| pwm.put(5, (view.value*255).asInteger); port.putAll(pwm.postln)};
Slider(win, Rect(210, 10, 30, 170)).action_{|view| pwm.put(6, (view.value*255).asInteger); port.putAll(pwm.postln)};
win.front;
CmdPeriod.doOnce({port.putAll([10, 0, 0, 0, 0, 0, 0, 11]); port.close; win.close});
//press cmd+. to stop and close window and serial port

s.waitForBoot{
        var byte, num= 6, index= 0, data= Array.newClear(num);
        Ndef(\arduino, {|data= #[0, 0, 0, 0, 0, 0]| Splay.ar(SinOsc.ar(data.lag(0.02)+500, 0, 0.4))}).play; //temp sound
        Routine.run({
                inf.do{
                        while({byte= port.read; byte.notNil}, {
                                //byte.postln;  //debug
                                if(index==0 and:{byte==20}, {//check if first byte is 20
                                        index= 1;
                                        }, {
                                                if(index>=1 and:{index<(num+1)}, {//ok, now start collecting bytes
                                                        data[index-1]= byte;
                                                        index= index+1;
                                                        }, {
                                                                if(index==(num+1) and:{byte==21}, {//until last data byte
                                                                        data.postln;    //debug
                                                                        Ndef(\arduino).setn(\data, data);
                                                                        index= 0;//done. reset index to prepare for new message
                                                                        }, {
                                                                                //something broke or beginning - restart
                                                                                "restart".postln;       //debug
                                                                                index= 0;
                                                                });
                                                });
                                });
                        });
                };
        });
};

)

i also attached the complete example as a zip file.

sc2 nostalgia

clean-up #32:

supercollider 2 (sc2) was such a great piece of software. thank you James McCartney. i plan to go back one day and i already have two old mac ti-books that still boot os9 natively. i also have a lot of patches for max/nato that i still think produces great graphics/video under os9 - so that’s another reason for ’downgrading’.

below is one of my first posts to sc-users. i gathered some courage and sent this mail in aug 2001.
(here is the full thread.) if you play the below sound in the newer supercollider versions it doesn’t sound nearly as good (in my ears). to get a few steps closer to that sc2 sound, try replacing the RHPF with GlitchRHPF from sc3-plugins. still it isn’t the same. listen to the attached mp3 recorded with sc2 to hear these five lines of code go wild in sc2.

------------------------------

Date: Thu, 16 Aug 2001 21:12:27 +0200
From: Fredrik Olofsson <---@---.--->
Subject: noisy instr.

hello

this works... (sc 2.2.11)

({
        RHPF.ar(
                BrownNoise.ar([1,1]),
                LFSaw.ar(1,0.99,2),
                0.24).clip2(0.5)
}.scope
)

this doesn't...

({
        RHPF.ar(
                BrownNoise.ar([1,1]),
                LFSaw.ar(1,0.99,1),             //note add difference
                0.24).clip2(0.5)
}.scope
)

how come the latter example runs fine for about 40 seconds and then
both channels 'get stuck' at +1, one after the other?  i've had the
former playing for at least 9 min.

confused/fredrik

AttachmentSize
Audio icon noisy_instr_ex.mp3629.5 KB

redUniform2

for an upcoming performance i've revisited the electronics for my redUniform piece. my old setup used a nordic nRF24L01 wireless chip but now i changed to wifi and the adafruit cc3000 module.

the circuit is really minimal and simple. basically it's just the cc3000 wifi module, an atmega328, a 16Mhz chrystal, an on/off switch, one 1000mAh Li-ion and last two 6p connectors for the sensors.

the sensors are two modified minIMU-9.


with the battery fully charged i had it sending osc data at 50hz for more than a whole day.

attached are schematics and arduino code for reading sensors via spi. the code also show how to talk to the cc3000 and send sensor data via osc.
there are also two classes for supercollider called RedUniform2 and RedUniform2GUI.

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