[sdiy] How to design out "usb noise"?

[Mattias Rickardsson]

Mike Bryant <mbryant at futurehorizons.com> skrev:

> Agreed it needs slightly more DSP.  But you probably had to spend longer
> avoiding any 1kHz getting onto the analogue output.
>

Getting curious here - is this audioframe-frequency disturbance a common
problem? I've honestly not had much issues with it, and it would be handy
to understand why. Sometimes on a prototype there's been a little 1.5 kHz
tone sticking its head up above the noisefloor, but then my EE looks over
his power supply caps etc and then it's gone.

Wonder if it's thanks to the layout, the power structure, the processors
used, the multi-layer boards, or just his superpowers? :-)

/mr

>
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