On Mon, Nov 13, 2006 at 03:01:48AM +0100, Karsten Wiese wrote: > Am Montag, 13. November 2006 01:28 schrieb Lee Revell: > > On Sun, 2006-11-12 at 21:29 +0100, Carlo Capocasa wrote: > > > > But the most intriguing part of the whole story: Not only did the noise > > > > get louder at a lower latency, it also seemed to precisely double its > > > > frequency when running at halve the number of frames. I even tried to > > > > measure the frequency of the noise. As far as I remember, when running > > > > jack for instance at 44100Hz, periodsize 32, the noise was at exactly > > > > 44100/32 = 1378Hz! > > > > > > That is absolutely fascinating. I WILL investigate this; if it > > > coincides, we have a VERY strong case that this is the same problem. > > > > Really sounds like you have a singing capacitor. IOW your problem is > > cheap hardware. If this is the case, you won't be able to fix it. > > > Guess Lee is right. > Does noise vanish when laptop is running on battery? Oooh yeah, I didn't notice you guys were talking about a laptop. Try unplugging the power supply. I found with all three laptops I've had (all Dells) that the power supply makes a lot of really horrible noise that leaks into all my audio gear. Only solution I've found is to use a 3-prong-to-2-prong power adapter and leave the grounding tab unconnected to anything. Dunno how safe that is :-\ -- Paul Winkler http://www.slinkp.com
