On Sun, 2007-03-25 at 21:46 -0400, Martin Peach wrote:
Chris McCormick wrote:
On Sun, Mar 25, 2007 at 07:23:13PM +0200, Roman Haefeli wrote:
[sqosc~]. it can happen, that after loading the patch, pd is sending constantly a dc to my soundcard. even when i close pd, the dc stays on these channels, where pd was connected before over jack. to get rid of
This happens on my laptop and I am pretty sure it occurs on a hardware level (in my case). The DC is present sometimes after just playing half an mp3 file and then hitting ctrl-C, and definately happens when doing stuff in Pd sometimes.
How can you guys tell if there's DC in the signal? I'd love to get a sound card that outputs DC!
hehe, actually i am not sure, if my soundcard physically outputs dc or if the output is high pass filtered. maybe i should elaborate a bit more my setup and what i did in order to explain, why i assume dc on the output.
i run pd over jackd and jackd runs on the rme card. the hdspmixer has a levelmeter for each input and output, so i can see the signal-levels that are sent from jackd to the outputs of the card.
here the jack-routing: pd out 1 -> hdsp out 1 pd out 2 -> hdsp out 2
now, when i load the help-patch of [sqosc~], the level-meters of hdsp out 1 and 2 show full amplitude and i hear a hard click on the loudspeakers (similar to the sound, when sending dc to the speakers). when i close the patch, the amplitude remains. when i disconnect pd from jack, the amplitude goes away and i hear a hard click again. but even if i restart pd, the amplitude comes immediately again (with the loud click, of course). also if i connect other softwares over jack to the hdsp out 1 and 2, the high amplitude comes again. to get rid of that, i must restart jack. but as soon as i load the help-patch of [sqosc~] again, i have the same situation again (loud click and full amplitude on the meters). i don't know of any other setup with that behaviour. this happens only, when i load a patch with one or more [sqosc~]s. that is why i assume, it is (at least a bit) related to [sqosc~].
roman
Telefonate ohne weitere Kosten vom PC zum PC: http://messenger.yahoo.de