hi,
maybe somebody has some ideas how to deal with it:
i have 2 soundcards with ess1371 in my machine. graphiccard is matrox g400.
system is debian demudi with 2.4.5 low latency on pentium 300Mhz. XFree86 4.1.0
whenever i move a window, or the edit a pd patch i get some really nasty additional noise on my audicards.
i m starting pd now with -frags 8, which reduced it, but not 100% .
thx for help
erich
hi erich,
the noise is comming from the power supply. every time the cpu transfers data, or calculates, the load on the power line varies. this variations you can hear through the analouge electronics on the soundcard. there is only a few you can do. a high-quality power supply helps in this situation. it must be strong enough to avoid ripples/noise on the power lines. also, try to move the audio cards as far away from other cards as possible. leave some slots as space between. it may also be the mainboard, which is weak designed by means of placement of the power traces ... the last thing would be to work on the card itself, by improving/rebuilding the power-supply of that card. but to do so, you should have good electronics experience.
best thing is to get a good soundcard, they usually have good power-filters etc. already on board.
greets,
chris
Am Mittwoch, 1. Mai 2002 13:21 schrieb rat@telecoma.net:
hi,
maybe somebody has some ideas how to deal with it:
i have 2 soundcards with ess1371 in my machine. graphiccard is matrox g400.
system is debian demudi with 2.4.5 low latency on pentium 300Mhz. XFree86 4.1.0
whenever i move a window, or the edit a pd patch i get some really nasty additional noise on my audicards.
i m starting pd now with -frags 8, which reduced it, but not 100% .
thx for help
erich
On Wed, 1 May 2002, Christian Klippel wrote:
hi erich,
the noise is comming from the power supply. every time the cpu transfers data, or calculates, the load on the power line varies. this variations you can hear through the analouge electronics on the soundcard.
but i have the impression that the noise just appears when i move a window, or window content is changing.
when my patches are running or some other background stuff is happening then i have no problems. wasnt there once a discussion about troubles with grafikcard and soundcard ?
thx
erich
erich:
may could also be network related in any way.. since it seems to happen in the instant network com happens.
list:
got the same/a similar problem with my hammerfall
it. yet i do have no clue, why (but it would have to be a buffer problem, i guess). another strange thing with the hammerfall: pd sounds fresh and clean (after the procedure above) yet other sound software like xmms sounds nasty...
martin
On Wed, 1 May 2002 rat@telecoma.net wrote:
On Wed, 1 May 2002, Christian Klippel wrote:
hi erich,
the noise is comming from the power supply. every time the cpu transfers data, or calculates, the load on the power line varies. this variations you can hear through the analouge electronics on the soundcard.
but i have the impression that the noise just appears when i move a window, or window content is changing.
when my patches are running or some other background stuff is happening then i have no problems. wasnt there once a discussion about troubles with grafikcard and soundcard ?
thx
erich
martin pi attacksyour.net/pi
johann strauss gasse 32 | 7 1040 vienna ++43 699 10 44 37 42
sil.at
On Thu, 2 May 2002, martin pi wrote:
list:
got the same/a similar problem with my hammerfall
- in my case doing some rmod and insmods solves
it. yet i do have no clue, why (but it would have to be a buffer problem, i guess). another strange thing with the hammerfall: pd sounds fresh and clean (after the procedure above) yet other sound software like xmms sounds nasty...
Which driver(+version) are you using ?
Guenter
whenever i move a window, or the edit a pd patch i get some really nasty additional noise on my audicards.
When you move a window or edit the pd patch, the CPU has to do a lot of work to redraw the gui. The result is that some fragments of audio do not get calculated, and thus you will hear a nasty 'click' when the audio signal suddenly drops out.
Also you should become familiar with the sound of the click (as compared to 'noise', which it is not) since the click is the most dreaded sound which all PD programmers must go to great lengths to prevent.
i m starting pd now with -frags 8, which reduced it, but not 100% .
That command will add latency to the audio stream... which only slightly reduces the chance that audio frames will be dropped during gui updates.
Other things you can try:
However nothing you do can assure the absence of a click since Linux is not a real-time operating system.
andy
Le Mercredi 1 Mai 2002 20:32, "Andrew (Andy) W. " Schmeder a écrit :
Other things you can try:
- Run PD w/ realtime priority (using the -rt flag and a set-uid bit)
- Close/shutdown as many applications as possible
- Use a lightweight window manager (e.g. fvwm, twm...)
- Get a faster computer
However nothing you do can assure the absence of a click since Linux is not a real-time operating system.
That's true but you can use the low-latency patch from: http://www.zip.com.au/~akpm/linux/schedlat.html#downloads
I applied the 2.4.18-rc1-low-latency.patch.gz one on the 2.4.18 source tree and despite a few patching warnings it compiled fine.
Right now i am using it and cannot hear clicks anymore when switching of virtual desktops for instance.
It is very efficient for audio recording too.
Linium
And also you might do a
chkconfig --list and see which un-needed progs might be running in the bakround that you do not need it matters what kind of Box you are running but i was able to shut off about 10 memory residents which made a nice difference
chkconfig --level 5 name_of_prog_hog off
cheers
Pat Pagano, Director South East Just Intonation Society http://www.screwmusicforever.com/SHREESWIFT/ ----- Original Message ----- From: intent intent@club-internet.fr To: Andrew (Andy) W. Schmeder andy@eh2o.ws; rat@telecoma.net; PD-List pd-list@iem.kug.ac.at Sent: Wednesday, May 01, 2002 8:25 PM Subject: Re: [PD] soundcard noise
Le Mercredi 1 Mai 2002 20:32, "Andrew (Andy) W. " Schmeder a écrit :
Other things you can try:
- Run PD w/ realtime priority (using the -rt flag and a set-uid bit)
- Close/shutdown as many applications as possible
- Use a lightweight window manager (e.g. fvwm, twm...)
- Get a faster computer
However nothing you do can assure the absence of a click since Linux is not a real-time operating system.
That's true but you can use the low-latency patch from: http://www.zip.com.au/~akpm/linux/schedlat.html#downloads
I applied the 2.4.18-rc1-low-latency.patch.gz one on the 2.4.18 source
tree
and despite a few patching warnings it compiled fine.
Right now i am using it and cannot hear clicks anymore when switching of virtual desktops for instance.
It is very efficient for audio recording too.
Linium
Aaa... Ok I am not 100% sure about this but this is what I think and wha ti have herd: Actually I think the noise is because the system bus gets clogged when a lot of video is going through the bus which is common when you are draggin windows or scrolling in IE. Its a common problem on laptops where the bus speed is pretty low (to save power) I dont really know what u can do to stop it apart from try not to do oto much video activity.. and use keyboard as much as possible for doing the windowing gui stuff.
-yOgi
-----Original Message----- From: shreeswifty [mailto:ppagano@bellsouth.net] Sent: Wednesday, May 01, 2002 8:38 PM To: intent@club-internet.fr; Andrew (Andy) W. Schmeder; rat@telecoma.net; PD-List Subject: Re: [PD] soundcard noise
And also you might do a
chkconfig --list and see which un-needed progs might be running in the bakround that you do not need it matters what kind of Box you are running but i was able to shut off about 10 memory residents which made a nice difference
chkconfig --level 5 name_of_prog_hog off
cheers
Pat Pagano, Director South East Just Intonation Society http://www.screwmusicforever.com/SHREESWIFT/ ----- Original Message ----- From: intent intent@club-internet.fr To: Andrew (Andy) W. Schmeder andy@eh2o.ws; rat@telecoma.net; PD-List pd-list@iem.kug.ac.at Sent: Wednesday, May 01, 2002 8:25 PM Subject: Re: [PD] soundcard noise
Le Mercredi 1 Mai 2002 20:32, "Andrew (Andy) W. " Schmeder a écrit :
Other things you can try:
- Run PD w/ realtime priority (using the -rt flag and a set-uid bit)
- Close/shutdown as many applications as possible
- Use a lightweight window manager (e.g. fvwm, twm...)
- Get a faster computer
However nothing you do can assure the absence of a click since Linux
is
not a real-time operating system.
That's true but you can use the low-latency patch from: http://www.zip.com.au/~akpm/linux/schedlat.html#downloads
I applied the 2.4.18-rc1-low-latency.patch.gz one on the 2.4.18 source
tree
and despite a few patching warnings it compiled fine.
Right now i am using it and cannot hear clicks anymore when switching
of
virtual desktops for instance.
It is very efficient for audio recording too.
Linium