12 Nov
2006
12 Nov
'06
10:22 p.m.
On Mon, Nov 13, 2006 at 03:01:48AM +0100, Karsten Wiese wrote:
Am Montag, 13. November 2006 01:28 schrieb Lee
Revell:
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
On Sun, 2006-11-12 at 21:29 +0100, Carlo Capocasa
wrote:
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? 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.