On Fri, May 28, 2010 at 8:37 AM, <fons@email-addr-hidden> wrote:
> On Fri, May 28, 2010 at 08:30:54AM -0700, Niels Mayer wrote:
>>[...]
> You're close. See the extra hint in a previous post.
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%20Performance.pdf
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
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Received on Sat May 29 00:15:07 2010
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