Hi everyone,

I got this info about the anolog audio output being cheap PWM with filtering from this thread :  http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=8684 
I'm assuming these guys know what they're talking about (I think the first reply metioning this is by a member of the Raspberry Pi team.

Cheers,

Pierre

2012/8/14 Michael Zacherl <sdiy-mz01@blauwurf.info>

On 14.8.2012, at 01:47 , Miller Puckette wrote:

> Thanks for the info... some quick ideas:

good to know but that didn't help.

I can't tell what it is but apparently it's a timing or order of execution issue at startup in batch-mode:
Delaying the ; pd dsp 1 message by 200ms helps avoiding the "device busy" error.
Same patch loaded in the gui, no problem.  :-\

According to 'top' the cpu load drops from 75% to about 70% with -nogui for a 4k-window.
Just about enough to avoid glitching.
But any system activity brings the sound to a halt for a short moment.

So that was just an ssh-session and Pd running in batch-mode.

At some point I'll go through this and see what can be done:
http://puredata.info/community/pdwiki/Optimize/

>> BTW, is it possible to quit Pd via the patch?
>> Just in case Pd has such high priority that the system becomes inaccessible.
>>
> Yep: the message is "; pd quit"

ah, of course!


thanks,  Michael.
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