cliveb;182179 Wrote: > I spent a while trying to discover the difference between "upsampling" > and "oversampling" in some other thread (possibly here, or maybe on > another forum). As far as I can make out, the two techniques achieve > the same thing (allowing the post-DAC anti-imaging filtering to move > higher up the frequency spectrum, and therefore out of harm's way). > > The point is, apart from the fringe NOS brigade, is it even possible to > buy a non-oversampling DAC these days? Surely the DAC inside the TP is > an oversampler? In which case, what additional benefit could one expect > to gain from upsampling as well?
Even without looking I can guarantee that the DAC within the SB3 is an oversampler. There is nothing magical about oversampling. Inside the DAC each 16-bit sample is used 8 times in succession and is fed into a digital FIR-filter which removes aliasing artifacts. This FIR filter will indeed brick-wall filter at 20kHz -but it does so in the digital domain -hence not introducing phase errors. Then a slow roll-off filter is used to filter the 8X oversampled FIR-filtered result to remove aliasing artifacts at Fs x 8. This analogue filter can roll off high up in frequency, thus not affecting the audio band. -- P Floding No, I didn't ABX it. And I won't even if you ask me. (Especially not if you ask me.) ------------------------------------------------------------------------ P Floding's Profile: http://forums.slimdevices.com/member.php?userid=2932 View this thread: http://forums.slimdevices.com/showthread.php?t=32940 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
