opaqueice;175930 Wrote: > That's a good point - that hadn't occurred to me. EMI in the range from > 20kHz - 40kHz would be inaudible added to the analogue output, but > jitter at that frequency could intermodulate with the digital signal to > produce audible distortion. For example 25kHz jitter can produce 10kHz > noise when a 15kHz signal is being played. (Note that jitter >40kHz > has no effect, assuming 20kHz is the threshhold for human hearing.) > > For this to work as an explanation you need the EMI from the switcher > to be concentrated mostly above 20kHz, which isn't consistent with the > measurements in the thread Skunk linked to. But still, it's an > interesting idea... what DAC do you use? > > Thanks for the interesting comment.
Re-reading your post I have to wonder what the 40kHz limit comes from? There is no hard limit to what HF can be down-mixed into the audio-band by way of modulating the DAC clock. (There may be actual limits for each particular design depending on the circuit properties.) -- P Floding ------------------------------------------------------------------------ P Floding's Profile: http://forums.slimdevices.com/member.php?userid=2932 View this thread: http://forums.slimdevices.com/showthread.php?t=32231 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
