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 Forum index » DIY Hardware and Software » ChucK programming language
adc distortion?
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jbucks



Joined: Jul 30, 2011
Posts: 6
Location: Berlin

PostPosted: Fri Feb 07, 2014 7:07 am    Post subject: adc distortion? Reply with quote  Mark this post and the followings unread

Hey everyone, just starting to do a bit of ChucK again a few weeks after the Coursera course finished.

I'm trying to use ChucK to sample my modular synth through my Presonus audio interface. To keep things simple, I've got a sine wave pulse going into ChucK like this:

Code:

adc.chan(0) => Gain inGain => dac;

0.2 => inGain.gain;


while ( true ) {
    2::second => now;
}


But the sine wave comes through with distortion, sounds almost like it's being amplitude modulated. When I listen to that sine wave through a DAW, it sounds perfect.

What am I doing wrong?
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jbucks



Joined: Jul 30, 2011
Posts: 6
Location: Berlin

PostPosted: Fri Feb 07, 2014 9:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Found a clue: changing the buffer size in miniAudicle causes different kinds of distortion… so at least one step closer to figuring out the problem.

EDIT: fixed, looks like setting the buffer size to 512 did the trick.
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Antimon



Joined: Jan 18, 2005
Posts: 3730
Location: Sweden
Audio files: 275
G2 patch files: 96

PostPosted: Fri Feb 07, 2014 10:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Glad to see that you were able to solve it. Yeah non-standard settings can cause all kinds of weird behaviour in the audio interfaces. When I use multiple inputs and/or outputs on my Motu Ultralite, there are only a few specific configurations that work. I can for instance set ChucK to use 4 or 8 outputs, but if I try setting output count to 6 I get behaviour similar to what you describe; screeching distortion coming from all ouputs at once etc.
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