[chuck-users] Some Summer Tidbits
mike clemow
gelfmuse at gmail.com
Wed Aug 5 15:40:07 EDT 2009
Hello again,
Okay, tail between my legs, I again attempt to share...
The loop resets the values of the event's members before broadcasting
the next Hid event. There seem to be extra Hid events firing for some
reason. Anyway, to avoid this, I've added an arbitrary but reasonable
control rate parameter that you can change. The default is 128::samp
and it seems to work better.
Enjoy,
Mike
On Wed, Aug 5, 2009 at 3:13 PM, mike clemow<gelfmuse at gmail.com> wrote:
> There are SEVERE problems with the input code I sent earlier. I may
> have jumped the gun on that one.
>
> Working on it now. Sorry!
>
> -Mike
>
> On Wed, Aug 5, 2009 at 12:55 PM, mike clemow<gelfmuse at gmail.com> wrote:
>> I'm sorry, folks. I accidentally hit "send" there. **slaps forehead**
>>
>> Basically, what I forgot to say was that using this method of
>> enveloping signals for granular synthesis puts almost all of the heavy
>> lifting on the UGens, which makes it perform really, really well in
>> realtime. I was able to achieve well over a thousand
>> grains-per-second with this method in realtime without overloading
>> ChucK. And that's specifying the parameters of each grain
>> individually on a per-grain basis in code!
>>
>> The best part is that the envelope can be tailored to be any shape
>> because it's all done with wavetable coefficients! That means that
>> you aren't limited to triangle, or ADSR shaped envelopes, which makes
>> a HUGE difference to the spectral properties of granular synthesis.
>>
>> To make the long story short, I'd love to hear your feedback on these
>> classes, especially if you find them helpful, useful, improvable, etc.
>>
>> ChucK on!
>>
>> _Mike
>>
>>
>>
>>
>> On Wed, Aug 5, 2009 at 12:49 PM, mike clemow<gelfmuse at gmail.com> wrote:
>>> Dear Chuckists,
>>>
>>> With the exception of a protracted discussion about garbage collection
>>> (of which I have yet to read the conclusion), things have been
>>> generally "all quiet on the ChucKian front" this summer.
>>> Nevertheless, I know that there are those of you who are still busy
>>> digging into this and that project with ChucK. I myself have been
>>> working (predictably, doggedly, stubbornly) on more granular synthesis
>>> stuff and wanted to share some recent classes that I find helpful to
>>> me in general (i.e. not just for granular synthesis).
>>>
>>> Part 1: INPUT
>>>
>>> I find that environments like Processing, SC, etc have very
>>> easy-to-use input calls like MouseX.kr etc, that easily bring the
>>> ability to add some interaction to your code, without having to set up
>>> a HidMsg, Hid pair and an event responder. Sometimes you just want
>>> mouse input and want it right now. I wanted to automate the process a
>>> little so that I could save some time by just telling ChucK to add the
>>> boiler plate listener for the mouse, keyboard, or a joystick in a
>>> separate thread and make the data available. With the MouseInput
>>> class, for instance, you can just do this:
>>>
>>> MouseInput mi;
>>> spork ~ mi.listen();
>>> me.yield();
>>>
>>> while(true)
>>> {
>>> mi => now;
>>> <<< mi.deltaX, mi.deltaY, mi.wheelDeltaX, mi.wheelDeltaY,
>>> mi.buttonDown, mi.buttonUp >>>;
>>> me.yield();
>>> }
>>>
>>> I find this easier to use. Maybe you will too. There's one for
>>> Keyboard input and joystick input too. I'm sure they can be improved,
>>> so please share any ideas you have.
>>>
>>>
>>>
>>> Part 2: WAVETABLES AS ENVELOPES
>>>
>>> Concept: A positive, unipolar wavetable can be used as a cheap,
>>> flexible alternative to envelope UGens by driving it with a Phasor and
>>> multiplying its output with your signal. The CurveEnvelope class:
>>>
>>> //
>>> // CurveTable Envelope
>>> //
>>>
>>> class CurveEnvelope
>>> {
>>> // members and default params
>>> Phasor drive => CurveTable curvetable => Gain multiplier;
>>> 3 => multiplier.op; // this is what makes the CurveTable an envelope!
>>> 0. => multiplier.gain; // we use this to gait the output, so start at 0.
>>>
>>> UGen source, out;
>>>
>>> 0 => drive.op; // stop the driver for now
>>>
>>> dac @=> out;
>>> 1. => float gain;
>>> 1::second => dur length;
>>> [0., 0., 0., 1., 1., 0., 2., 0.] => curvetable.coefs; // triangle window
>>>
>>> // methods
>>> fun void setEnvelopeCoefs( float _coefs[] )
>>> {
>>> _coefs => curvetable.coefs;
>>> }
>>>
>>> fun void connectSource( UGen src )
>>> {
>>> src @=> source;
>>> }
>>>
>>> fun void connectOutput( UGen destination )
>>> {
>>> destination @=> out;
>>> }
>>>
>>> fun void trigger()
>>> {
>>> source => multiplier => out; // connect things
>>> gain => multiplier.gain; // open gait
>>> 1 => drive.op;
>>> 0. => drive.phase; // reset driver to beginning of envelope curve
>>> 1. / (length / second) => drive.freq; // calculate speed of
>>> driver in Hz
>>> length => now; // let it happen...
>>> 0. => multiplier.gain; // close gait
>>> 0 => drive.op;
>>> source =< multiplier =< out; // disconnect things
>>> }
>>> }
>>>
>>>
>>> USAGE:
>>>
>>> CurveEnvelope ce;
>>> SinOsc s;
>>> ce.connectSource( s );
>>> ce.connectOutput( dac );
>>> ce.trigger();
>>>
>>> TriOsc t;
>>> ce.connectSource( t );
>>> ce.connectOutput( dac );
>>> ce.trigger();
>>> <<< "done" >>>;
>>>
>>>
>>>
>>> --
>>> http://michaelclemow.com
>>> http://semiotech.org
>>>
>>
>>
>>
>> --
>> http://michaelclemow.com
>> http://semiotech.org
>>
>
>
>
> --
> http://michaelclemow.com
> http://semiotech.org
>
--
http://michaelclemow.com
http://semiotech.org
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