[chuck-users] Beginner question about audio artifacts

[Hans Aberg]

On 15 Apr 2012, at 18:26, Tom Lieber wrote:

>> 2. My collaborator for this project uses OSX and doesn't experience the same
>> clipping/artifacts that I do.  I installed Ubuntu Linux on the same hardware
>> config as I was using Windows 7 and I was able to add many, many more shreds
>> without any noticeable clipping.  Can anybody speak to this?
> 
> The OS does its own clipping between ChucK and the sound card. OS X
> usually does a fine job of scaling down audio that is well out of
> bounds, but different operating systems do it in different ways. On OS
> X I've found that limiting gain in ChucK is basically unnecessary.

That seems to be something new for OS X 10.7. The file diatonic.ck (link below), by which one can play as many notes as the computer keyboard admits, used to require setting g.gain < 1.0 on OS X 10.6.8 to avoid clipping, but when now trying in 10.7.3, it does not seem to be needed.

In 10.6, OS X switched to using floating point numbers, which avoids the clipping problem at the OS level. So either 10.7 is doing a better job, or perhaps Chuck 1.2.1.4-beta-1 has switched to that to?

Hans


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