28 May
2010
28 May
'10
8:27 p.m.
On Fri, May 28, 2010 at 8:37 AM, <fons(a)kokkinizita.net> wrote:
On Fri, May 28, 2010 at 08:30:54AM -0700, Niels Mayer
wrote:
It the "close" has to do with jitter:
* Something on the USB bus is causing a "periodic jitter" with a cycle of
100Hz?
* Something is causing a buffer to become empty every 0.01 seconds and
causing a periodic desync?
If the "close" has to do with induced or actual 50hz hum, perhaps
frequency-doubled via rectification:
* something in the USB power supply, as well as how that power supply
floats w/r/t ground (ground noise) is the source.
Which would agree with the Wolfson experts from
http://wolfsonmicro.com/uploads/documents/en/Specifying%20Jitter%20Performa…
stating "One of the authors once spent several days trying to track
down a low-frequency jitter problem, only to find that it was in fact
a problem of LF noise on the voltage reference."
Niels
http://nielsmayer.com
[...]
You're close. See the extra hint
in a previous post.