On 04/07/2011 12:34 AM, Dave Phillips wrote:
we observed exactly the same problem (only on the output of a custom
made USB sound card). The noise was spikes of varying amplitude at a
fixed rate (125ms if I remember well). Replacing the USB cable by a
shorter one significantly reduced the problem, and it also depended on
the USB ports used for mouse and sound card. On some mainboards/laptops
the noise was less then on others.